Track vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
7.9
CVE-2026-74387: Linux kernel may crash during MIDI event processing
CVE-2026-74387 · published 2 months ago
Summary
The standard Linux kernel packages from Canonical (including AWS, Azure, and LTS Xenial versions) contain a flaw in how MIDI data is handled. When certain MIDI streams are opened and closed, the system can use memory that has already been released, leading to crashes or potentially unsafe behavior. Update to the latest kernel packages from your Linux distribution to apply the fix.
What to do
- Update debian linux to version 7.1.5-1.
- Update debian linux to version 6.1.180-1.
- Update debian linux to version 6.12.100-1.
- Update canonical linux to version 6.8.0-147.147.
- Update canonical linux-aws to version 6.8.0-1067.70.
- Update canonical linux-aws-7.0 to version 7.0.0-1014.14~24.04.1.
- Update canonical linux-azure to version 6.8.0-1071.79.
- Update canonical linux-azure-7.0 to version 7.0.0-1017.17~24.04.1.
- Update canonical linux-azure-fde to version 6.8.0-1069.76.
- Update canonical linux-azure-fde-7.0 to version 7.0.0-1016.16~24.04.1.
- Update canonical linux-gcp to version 6.8.0-1071.79.
- Update canonical linux-gcp-7.0 to version 7.0.0-1014.14~24.04.1.
- Update canonical linux-gke to version 6.8.0-1066.74.
- Update canonical linux-gkeop to version 6.8.0-1052.56.
- Update canonical linux-hwe-7.0 to version 7.0.0-38.38~24.04.4.
- Update canonical linux-ibm to version 6.8.0-1067.68.
- Update canonical linux-lowlatency to version 6.8.0-147.147.1.
- Update canonical linux-nvidia-tegra to version 6.8.0-1036.39.
- Update canonical linux-oracle to version 6.8.0-1064.67.
- Update canonical linux-oracle-7.0 to version 7.0.0-1013.13~24.04.1.
- Update canonical linux-riscv-7.0 to version 7.0.0-38.38.1~24.04.1.
- Update canonical linux-bluefield to version 6.8.0-1033.38.
- Update canonical linux-realtime to version 6.8.1-1062.63.
- Update canonical linux-aws-fips to version 6.8.0-1067.70+fips1.
- Update canonical linux-azure-fips to version 6.8.0-1071.79+fips1.
- Update canonical linux-fips to version 6.8.0-147.147+fips1.
- Update canonical linux-gcp-fips to version 6.8.0-1071.79+fips1.
- Update canonical linux to version 7.0.0-38.38.
- Update canonical linux-aws to version 7.0.0-1014.14.
- Update canonical linux-azure to version 7.0.0-1017.17.
- Update canonical linux-azure-fde to version 7.0.0-1016.16.
- Update canonical linux-gcp to version 7.0.0-1014.14.
- Update canonical linux-gke to version 7.0.0-1008.9.
- Update canonical linux-ibm to version 7.0.0-1015.15.
- Update canonical linux-oem-7.0 to version 7.0.0-1015.15.
- Update canonical linux-oracle to version 7.0.0-1013.13.
- Update canonical linux-realtime to version 7.0.0-38.38.1.
- Update canonical linux-riscv to version 7.0.0-38.38.1.
- Update linux kernel to version 7.1.5.
- Update linux linux to version f5d470b808bc01f70978e22e595c6f7768313406 or later.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:14.04:LTS | canonical | linux | All versions |
| Ubuntu:Pro:14.04:LTS | canonical | linux-aws | All versions |
| Ubuntu:Pro:14.04:LTS | canonical | linux-azure | All versions |
| Ubuntu:Pro:14.04:LTS | canonical | linux-lts-xenial | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-aws-hwe | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-gcp | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-hwe | All versions |
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-kvm | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-oracle | All versions |
| Ubuntu:Pro:FIPS:16.04:LTS | canonical | linux-fips | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.3 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-aws-5.4 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-azure-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-5.3 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-azure-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-edge | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-gcp-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.3 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-gcp-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gkeop-5.4 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-hwe-5.4 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-ibm-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oem | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.3 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-oracle-5.4 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | linux-raspi-5.4 | All versions |
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-aws-fips | All versions |
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-azure-fips | All versions |
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-gcp-fips | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-aws-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-azure-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-fde | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-azure-fde-5.15 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-bluefield | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-gcp-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke | All versions |
Showing 50 of 201. Show the rest
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:20.04:LTS | canonical | linux-gke-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-hwe-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.8 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-ibm | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-ibm-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-intel-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-intel-iotg-5.15 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-iot | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-lowlatency-hwe-5.15 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-nvidia-tegra-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.10 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.14 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.6 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.13 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-oracle-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.8 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-raspi | All versions |
| Ubuntu:20.04:LTS | canonical | linux-raspi2 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.11 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-riscv-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.8 | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | linux-xilinx-zynqmp | All versions |
| Ubuntu:22.04:LTS | canonical | linux-allwinner-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-ibm-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-intel-iot-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-intel-iotg | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-tegra | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-tegra-igx | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-5.17 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.0 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.1 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oracle-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oracle-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-6.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.5 | All versions |
| Ubuntu:Pro:Realtime:22.04:LTS | canonical | linux-realtime-6.8 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-7.0 |
< 7.0.0-1014.14~24.04.1 Fix: upgrade to 7.0.0-1014.14~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-azure-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-7.0 |
< 7.0.0-1017.17~24.04.1 Fix: upgrade to 7.0.0-1017.17~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-7.0 |
< 7.0.0-1016.16~24.04.1 Fix: upgrade to 7.0.0-1016.16~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-azure-nvidia | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-nvidia-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-7.0 |
< 7.0.0-1014.14~24.04.1 Fix: upgrade to 7.0.0-1014.14~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-7.0 |
< 7.0.0-38.38~24.04.4 Fix: upgrade to 7.0.0-38.38~24.04.4
|
| Ubuntu:24.04:LTS | canonical | linux-lowlatency-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-lowlatency | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.8 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-7.0 |
< 7.0.0-1013.13~24.04.1 Fix: upgrade to 7.0.0-1013.13~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-raspi-realtime | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-7.0 |
< 7.0.0-38.38.1~24.04.1 Fix: upgrade to 7.0.0-38.38.1~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-xilinx | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.14 | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.17 | All versions |
| Ubuntu:26.04:LTS | canonical | linux-nvidia-bos | All versions |
| Ubuntu:26.04:LTS | canonical | linux-oem-7.0 |
< 7.0.0-1015.15 Fix: upgrade to 7.0.0-1015.15
|
| Debian:14 | debian | linux |
< 7.1.5-1 Fix: upgrade to 7.1.5-1
|
| – | linux | linux |
< f5d470b808bc01f70978e22e595c6f7768313406 2.6.12 |
| Debian:11 | debian | linux | All versions |
| Debian:12 | debian | linux |
< 6.1.180-1 Fix: upgrade to 6.1.180-1
|
| Debian:13 | debian | linux |
< 6.12.100-1 Fix: upgrade to 6.12.100-1
|
| Ubuntu:24.04:LTS | canonical | linux |
< 6.8.0-147.147 Fix: upgrade to 6.8.0-147.147
|
| Ubuntu:24.04:LTS | canonical | linux-aws |
< 6.8.0-1067.70 Fix: upgrade to 6.8.0-1067.70
|
| Ubuntu:24.04:LTS | canonical | linux-azure |
< 6.8.0-1071.79 Fix: upgrade to 6.8.0-1071.79
|
| Ubuntu:24.04:LTS | canonical | linux-azure-fde |
< 6.8.0-1069.76 Fix: upgrade to 6.8.0-1069.76
|
| Ubuntu:24.04:LTS | canonical | linux-gcp |
< 6.8.0-1071.79 Fix: upgrade to 6.8.0-1071.79
|
| Ubuntu:24.04:LTS | canonical | linux-gke |
< 6.8.0-1066.74 Fix: upgrade to 6.8.0-1066.74
|
| Ubuntu:24.04:LTS | canonical | linux-gkeop |
< 6.8.0-1052.56 Fix: upgrade to 6.8.0-1052.56
|
| Ubuntu:24.04:LTS | canonical | linux-ibm |
< 6.8.0-1067.68 Fix: upgrade to 6.8.0-1067.68
|
| Ubuntu:24.04:LTS | canonical | linux-lowlatency |
< 6.8.0-147.147.1 Fix: upgrade to 6.8.0-147.147.1
|
| Ubuntu:24.04:LTS | canonical | linux-nvidia-tegra |
< 6.8.0-1036.39 Fix: upgrade to 6.8.0-1036.39
|
| Ubuntu:24.04:LTS | canonical | linux-oracle |
< 6.8.0-1064.67 Fix: upgrade to 6.8.0-1064.67
|
| Ubuntu:Nvidia-BlueField:24.04:LTS | canonical | linux-bluefield |
< 6.8.0-1033.38 Fix: upgrade to 6.8.0-1033.38
|
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime |
< 6.8.1-1062.63 Fix: upgrade to 6.8.1-1062.63
|
| Ubuntu:Pro:FIPS-updates:24.04:LTS | canonical | linux-aws-fips |
< 6.8.0-1067.70+fips1 Fix: upgrade to 6.8.0-1067.70+fips1
|
| Ubuntu:Pro:FIPS-updates:24.04:LTS | canonical | linux-azure-fips |
< 6.8.0-1071.79+fips1 Fix: upgrade to 6.8.0-1071.79+fips1
|
| Ubuntu:Pro:FIPS-updates:24.04:LTS | canonical | linux-fips |
< 6.8.0-147.147+fips1 Fix: upgrade to 6.8.0-147.147+fips1
|
| Ubuntu:Pro:FIPS-updates:24.04:LTS | canonical | linux-gcp-fips |
< 6.8.0-1071.79+fips1 Fix: upgrade to 6.8.0-1071.79+fips1
|
| Ubuntu:26.04:LTS | canonical | linux |
< 7.0.0-38.38 Fix: upgrade to 7.0.0-38.38
|
| Ubuntu:26.04:LTS | canonical | linux-aws |
< 7.0.0-1014.14 Fix: upgrade to 7.0.0-1014.14
|
| Ubuntu:26.04:LTS | canonical | linux-azure |
< 7.0.0-1017.17 Fix: upgrade to 7.0.0-1017.17
|
| Ubuntu:26.04:LTS | canonical | linux-azure-fde |
< 7.0.0-1016.16 Fix: upgrade to 7.0.0-1016.16
|
| Ubuntu:26.04:LTS | canonical | linux-gcp |
< 7.0.0-1014.14 Fix: upgrade to 7.0.0-1014.14
|
| Ubuntu:26.04:LTS | canonical | linux-gke |
< 7.0.0-1008.9 Fix: upgrade to 7.0.0-1008.9
|
| Ubuntu:26.04:LTS | canonical | linux-ibm |
< 7.0.0-1015.15 Fix: upgrade to 7.0.0-1015.15
|
| Ubuntu:26.04:LTS | canonical | linux-oracle |
< 7.0.0-1013.13 Fix: upgrade to 7.0.0-1013.13
|
| Ubuntu:26.04:LTS | canonical | linux-realtime |
< 7.0.0-38.38.1 Fix: upgrade to 7.0.0-38.38.1
|
| Ubuntu:26.04:LTS | canonical | linux-riscv |
< 7.0.0-38.38.1 Fix: upgrade to 7.0.0-38.38.1
|
| Linux | linux | kernel |
>= 6.19.0, < 7.1.5 Fix: upgrade to 7.1.5
|
Original advisory text
ALSA: seq: midi: Serialize output teardown with event_input
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: midi: Serialize output teardown with event_input event_process_midi() borrows msynth->output_rfile.output and then passes the substream to dump_midi() and snd_rawmidi_kernel_write() without synchronizing with the output open/close transition. midisynth_use() also publishes output_rfile before snd_rawmidi_output_params() has finished. The last midisynth_unuse() can therefore release the same rawmidi file and free substream->runtime before snd_rawmidi_kernel_write1() takes its runtime buffer reference. That leaves the event_input path using a stale substream or runtime and can end in a NULL-deref or use-after-free. Fix this with two pieces of synchronization. Keep a short IRQ-safe spinlock only for publishing or clearing output_rfile and for pairing the output snapshot with an snd_use_lock_t reference. Once event_process_midi() has taken that in-flight reference, it drops the spinlock before calling snd_seq_dump_var_event(), dump_midi(), or snd_rawmidi_kernel_write(). midisynth_unuse() now detaches the visible rawmidi file under the same spinlock, waits for the in-flight writers to drain, and only then drains and releases the saved file. midisynth_use() likewise opens into a local snd_rawmidi_file and publishes it only after snd_rawmidi_output_params() succeeds. The buggy scenario involves two paths, with each column showing the order within that path: event_input path: last unuse path: 1. event_process_midi() snapshots 1. midisynth_unuse() starts output_rfile.output. tearing down output_rfile. 2. dump_midi() reaches 2. snd_rawmidi_kernel_release() snd_rawmidi_kernel_write() closes the output file. before runtime is pinned. 3. close_substream() frees 3. The callback keeps using substream->runtime. the borrowed substream. Validation reproduced this kernel report: KASAN null-ptr-deref in snd_rawmidi_kernel_write1+0x56/0x360 RIP: 0033:0x7fde7dd0837f RIP: 0010:snd_rawmidi_kernel_write1+0x56/0x360
References
- https://security-tracker.debian.org/tracker/CVE-2026-74387 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8888-1 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-74387 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-74387 Third Party Advisory
- https://git.kernel.org/linus/ef7607ab1c8adc6258fb1b27d08e26aecdc18a58 Third Party Advisory
- https://git.kernel.org/stable/c/11165fe2c5ea0516debe486d91df67abbe36905e Third Party Advisory
- https://git.kernel.org/stable/c/718f6a56b40875f19e6915799044a02df9abfd52 Third Party Advisory
- https://git.kernel.org/stable/c/936641af564c3d92721704b781e36aaf223efdd2 Third Party Advisory
- https://git.kernel.org/stable/c/d6fd2afb137f52bf00c5210cc44d08ed54dcffb4 Third Party Advisory
- https://git.kernel.org/stable/c/ef7607ab1c8adc6258fb1b27d08e26aecdc18a58 Third Party Advisory
- https://git.kernel.org/stable/c/f5d470b808bc01f70978e22e595c6f7768313406 Third Party Advisory
- https://ubuntu.com/security/notices/USN-8889-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8887-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8886-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8888-2 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8887-2 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8887-3 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8917-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8918-1 Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74387... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-74387 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Severity
7.9
High
Timeline
Published15 Aug 2026
Updated28 Oct 2026
First seen15 Aug 2026
Sources
CVE-2026-74387 · NVD
CVE-2026-74387 · MITRE
DEBIAN-CVE-2026-74387 · OSV
UBUNTU-CVE-2026-74387 · OSV
CVE-2026-74387 · OSV
Track software like this
Free during beta