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CVE-2026-53079: Linux kernel network component may leak memory, affecting performance
CVE-2026-53079 · published 4 months ago
Summary
The network scheduling code in certain Linux kernel versions (including the HWE Edge, AWS 5.0 and 5.3, Azure, and Azure 5.3 builds) could fail to release memory for some packets, causing a slow build‑up of unused memory. Over time this can reduce system efficiency or lead to crashes. Updating the kernel to the latest package from your distribution will apply the fix and prevent the memory leak.
What to do
- Update canonical linux-hwe-7.0 to version 7.0.0-28.28~24.04.1.
- Update canonical linux to version 7.0.0-28.28.
- Update debian linux to version 7.0.10-1.
- Update canonical linux-aws to version 7.0.0-1009.9.
- Update canonical linux-azure to version 7.0.0-1010.10.
- Update canonical linux-azure-fde to version 7.0.0-1009.9.
- Update canonical linux-gcp to version 7.0.0-1008.8.
- Update canonical linux-gke to version 7.0.0-1003.4.
- Update canonical linux-ibm to version 7.0.0-1010.10.
- Update canonical linux-oem-7.0 to version 7.0.0-1009.9.
- Update canonical linux-oracle to version 7.0.0-1008.8.
- Update canonical linux-raspi to version 7.0.0-1015.15.
- Update canonical linux-realtime to version 7.0.0-28.28.1.
- Update canonical linux-riscv to version 7.0.0-28.28.1.
- Update canonical linux-nvidia-7.0 to version 7.0.0-1016.16~24.04.1.
- Update canonical linux-riscv-7.0 to version 7.0.0-28.28.1~24.04.3.
- Update canonical linux-nvidia to version 7.0.0-1016.16.
- Update canonical linux-nvidia-bos to version 7.0.0-2016.16.
- Update canonical linux-azure-7.0 to version 7.0.0-1014.14~24.04.1.
- Update canonical linux-gcp-7.0 to version 7.0.0-1011.11~24.04.1.
- Update canonical linux-oracle-7.0 to version 7.0.0-1011.11~24.04.1.
- Update linux kernel to version 7.0.10.
- Update canonical linux-azure-fde-7.0 to version 7.0.0-1013.13~24.04.1.
- Update linux linux_kernel to version 7.0.10 or later.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | 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:18.04:LTS | canonical | linux-azure | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.3 | 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:18.04:LTS | canonical | linux-hwe | All versions |
| Ubuntu:18.04:LTS | canonical | linux-hwe-edge | 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:20.04:LTS | canonical | linux-aws-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.13 | 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:20.04:LTS | canonical | linux-azure-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-fde | 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:20.04:LTS | canonical | linux-gcp-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke | All 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:20.04:LTS | canonical | linux-hwe-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-intel-5.13 | 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:20.04:LTS | canonical | linux-oracle-5.8 | 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:20.04:LTS | canonical | linux-riscv-5.8 | 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-azure-5.19 | All versions |
Showing 50 of 123. Show the rest
| Ecosystem | Vendor | Product | Affected 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-fde-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.2 | 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-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-intel-iot-realtime | 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-nvidia-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.5 | 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-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv | 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-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:24.04:LTS | canonical | linux-aws-6.14 | All versions |
| 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-fde-6.14 | 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-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-7.0 |
< 7.0.0-28.28~24.04.1 Fix: upgrade to 7.0.0-28.28~24.04.1
|
| 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-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-oem-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.14 | 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-raspi-realtime | All versions |
| Ubuntu:24.04:LTS | canonical | linux-realtime | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.14 | All versions |
| Ubuntu:Nvidia-BlueField:24.04:LTS | canonical | linux-bluefield | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.14 | All versions |
| Ubuntu:26.04:LTS | canonical | linux |
< 7.0.0-28.28 Fix: upgrade to 7.0.0-28.28
|
| Debian:14 | debian | linux |
< 7.0.10-1 Fix: upgrade to 7.0.10-1
|
| Ubuntu:26.04:LTS | canonical | linux-aws |
< 7.0.0-1009.9 Fix: upgrade to 7.0.0-1009.9
|
| Ubuntu:26.04:LTS | canonical | linux-azure |
< 7.0.0-1010.10 Fix: upgrade to 7.0.0-1010.10
|
| Ubuntu:26.04:LTS | canonical | linux-azure-fde |
< 7.0.0-1009.9 Fix: upgrade to 7.0.0-1009.9
|
| Ubuntu:26.04:LTS | canonical | linux-gcp |
< 7.0.0-1008.8 Fix: upgrade to 7.0.0-1008.8
|
| Ubuntu:26.04:LTS | canonical | linux-gke |
< 7.0.0-1003.4 Fix: upgrade to 7.0.0-1003.4
|
| Ubuntu:26.04:LTS | canonical | linux-ibm |
< 7.0.0-1010.10 Fix: upgrade to 7.0.0-1010.10
|
| Ubuntu:26.04:LTS | canonical | linux-nvidia |
< 7.0.0-1016.16 Fix: upgrade to 7.0.0-1016.16
|
| Ubuntu:26.04:LTS | canonical | linux-nvidia-bos |
< 7.0.0-2016.16 Fix: upgrade to 7.0.0-2016.16
|
| Ubuntu:26.04:LTS | canonical | linux-oem-7.0 |
< 7.0.0-1009.9 Fix: upgrade to 7.0.0-1009.9
|
| Ubuntu:26.04:LTS | canonical | linux-oracle |
< 7.0.0-1008.8 Fix: upgrade to 7.0.0-1008.8
|
| Ubuntu:26.04:LTS | canonical | linux-raspi |
< 7.0.0-1015.15 Fix: upgrade to 7.0.0-1015.15
|
| Ubuntu:26.04:LTS | canonical | linux-realtime |
< 7.0.0-28.28.1 Fix: upgrade to 7.0.0-28.28.1
|
| Ubuntu:26.04:LTS | canonical | linux-riscv |
< 7.0.0-28.28.1 Fix: upgrade to 7.0.0-28.28.1
|
| Ubuntu:24.04:LTS | canonical | linux-azure-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-gcp-7.0 |
< 7.0.0-1011.11~24.04.1 Fix: upgrade to 7.0.0-1011.11~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-oracle-7.0 |
< 7.0.0-1011.11~24.04.1 Fix: upgrade to 7.0.0-1011.11~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-riscv-7.0 |
< 7.0.0-28.28.1~24.04.3 Fix: upgrade to 7.0.0-28.28.1~24.04.3
|
| – | linux | linux_kernel |
>= 6.19, < 7.0.10 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-7.0 |
< 7.0.0-1013.13~24.04.1 Fix: upgrade to 7.0.0-1013.13~24.04.1
|
| Linux | linux | kernel |
>= 6.19.0, < 7.0.10 Fix: upgrade to 7.0.10
|
Original advisory text
net_sched: fix skb memory leak in deferred qdisc drops
In the Linux kernel, the following vulnerability has been resolved: net_sched: fix skb memory leak in deferred qdisc drops When the network stack cleans up the deferred list via qdisc_run_end(), it operates on the root qdisc. If the root qdisc do not implement the TCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and gets stranded on the child's local to_free list. Fix this by making qdisc_dequeue_drop() aware of the root qdisc. It fetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If the flag is present, the packet is appended directly to the root's to_free list. Otherwise, drop it directly as it was done before the optimization was implemented.
References
- https://ubuntu.com/security/notices/USN-8663-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8664-1 Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2026-53079 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-53079 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-53079 Third Party Advisory
- https://git.kernel.org/linus/a6bd339dbb3514bce690fdcf252e788dfab4ee76 Third Party Advisory
- https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76 URL
- https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf URL
- https://ubuntu.com/security/notices/USN-8728-3 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8728-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8728-2 Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53079... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-53079 Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
- https://ubuntu.com/security/notices/USN-8566-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8568-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8569-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8593-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8603-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8618-1 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Type
CWE-401Memory Leak
Timeline
Published24 Jun 2026
Updated26 Oct 2026
First seen24 Jun 2026
Sources
UBUNTU-CVE-2026-53079 · OSV
DEBIAN-CVE-2026-53079 · OSV
CVE-2026-53079 · NVD
CVE-2026-53079 · OSV
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