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6.7
CVE-2021-46953: Ubuntu Linux kernel may mishandle hardware interrupt setup
CVE-2021-46953 · published 2 years ago
Summary
A part of the Ubuntu Linux kernel that prepares internal processor signals can accidentally remove a signal mapping if it encounters bad low‑level software data. This can cause occasional system instability or crashes on the affected Ubuntu cloud images. Updating to the latest Ubuntu kernel package fixes the issue.
What to do
- Update canonical linux-azure to version 4.15.0-1121.134~14.04.1.
- Update canonical linux-aws-hwe to version 4.15.0-1109.116~16.04.1.
- Update canonical linux-azure to version 4.15.0-1121.134~16.04.1.
- Update canonical linux-gcp to version 4.15.0-1106.120~16.04.1.
- Update canonical linux-hwe to version 4.15.0-151.157~16.04.1.
- Update canonical linux-oracle to version 4.15.0-1078.86~16.04.1.
- Update canonical linux to version 4.15.0-151.157.
- Update canonical linux-aws to version 4.15.0-1109.116.
- Update canonical linux-aws-5.4 to version 5.4.0-1051.53~18.04.1.
- Update canonical linux-azure-4.15 to version 4.15.0-1121.134.
- Update canonical linux-azure-5.4 to version 5.4.0-1051.53~18.04.1.
- Update canonical linux-gcp-4.15 to version 4.15.0-1106.120.
- Update canonical linux-gcp-5.4 to version 5.4.0-1046.49~18.04.1.
- Update canonical linux-hwe-5.4 to version 5.4.0-77.86~18.04.1.
- Update canonical linux-kvm to version 4.15.0-1097.99.
- Update canonical linux-oracle to version 4.15.0-1078.86.
- Update canonical linux-oracle-5.4 to version 5.4.0-1048.52~18.04.1.
- Update canonical linux-raspi-5.4 to version 5.4.0-1038.41~18.04.1.
- Update canonical linux-aws-fips to version 4.15.0-2051.53.
- Update canonical linux-azure-fips to version 4.15.0-2033.37.
- Update canonical linux-fips to version 4.15.0-1066.75.
- Update canonical linux-gcp-fips to version 4.15.0-2016.18.
- Update canonical linux to version 5.4.0-77.86.
- Update canonical linux-aws to version 5.4.0-1051.53.
- Update canonical linux-azure to version 5.4.0-1051.53.
- Update canonical linux-bluefield to version 5.4.0-1013.16.
- Update canonical linux-gcp to version 5.4.0-1046.49.
- Update canonical linux-gkeop to version 5.4.0-1018.19.
- Update canonical linux-kvm to version 5.4.0-1041.42.
- Update canonical linux-oracle to version 5.4.0-1048.52.
- Update canonical linux-raspi to version 5.4.0-1038.41.
- Update canonical linux-aws-fips to version 5.4.0-1069.73+fips2.
- Update canonical linux-azure-fips to version 5.4.0-1073.76+fips1.
- Update canonical linux-fips to version 5.4.0-1028.32.
- Update canonical linux-gcp-fips to version 5.4.0-1067.71~20.04.1.
- Update debian linux to version 5.10.38-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:14.04:LTS | canonical | linux-azure |
< 4.15.0-1121.134~14.04.1 Fix: upgrade to 4.15.0-1121.134~14.04.1
|
| Ubuntu:Pro:16.04:LTS | canonical | linux-aws-hwe |
< 4.15.0-1109.116~16.04.1 Fix: upgrade to 4.15.0-1109.116~16.04.1
|
| Ubuntu:Pro:16.04:LTS | canonical | linux-azure |
< 4.15.0-1121.134~16.04.1 Fix: upgrade to 4.15.0-1121.134~16.04.1
|
| Ubuntu:Pro:16.04:LTS | canonical | linux-gcp |
< 4.15.0-1106.120~16.04.1 Fix: upgrade to 4.15.0-1106.120~16.04.1
|
| Ubuntu:Pro:16.04:LTS | canonical | linux-hwe |
< 4.15.0-151.157~16.04.1 Fix: upgrade to 4.15.0-151.157~16.04.1
|
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | linux-oracle |
< 4.15.0-1078.86~16.04.1 Fix: upgrade to 4.15.0-1078.86~16.04.1
|
| Ubuntu:18.04:LTS | canonical | linux |
< 4.15.0-151.157 Fix: upgrade to 4.15.0-151.157
|
| Ubuntu:18.04:LTS | canonical | linux-aws |
< 4.15.0-1109.116 Fix: upgrade to 4.15.0-1109.116
|
| Ubuntu:18.04:LTS | canonical | linux-aws-5.4 |
< 5.4.0-1051.53~18.04.1 Fix: upgrade to 5.4.0-1051.53~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-azure-4.15 |
< 4.15.0-1121.134 Fix: upgrade to 4.15.0-1121.134
|
| Ubuntu:18.04:LTS | canonical | linux-azure-5.4 |
< 5.4.0-1051.53~18.04.1 Fix: upgrade to 5.4.0-1051.53~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-gcp-4.15 |
< 4.15.0-1106.120 Fix: upgrade to 4.15.0-1106.120
|
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.4 |
< 5.4.0-1046.49~18.04.1 Fix: upgrade to 5.4.0-1046.49~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-hwe-5.4 |
< 5.4.0-77.86~18.04.1 Fix: upgrade to 5.4.0-77.86~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-kvm |
< 4.15.0-1097.99 Fix: upgrade to 4.15.0-1097.99
|
| Ubuntu:18.04:LTS | canonical | linux-oracle |
< 4.15.0-1078.86 Fix: upgrade to 4.15.0-1078.86
|
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.4 |
< 5.4.0-1048.52~18.04.1 Fix: upgrade to 5.4.0-1048.52~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-raspi-5.4 |
< 5.4.0-1038.41~18.04.1 Fix: upgrade to 5.4.0-1038.41~18.04.1
|
| 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:Pro:FIPS-updates:18.04:LTS | canonical | linux-aws-fips |
< 4.15.0-2051.53 Fix: upgrade to 4.15.0-2051.53
|
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-azure-fips |
< 4.15.0-2033.37 Fix: upgrade to 4.15.0-2033.37
|
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-fips |
< 4.15.0-1066.75 Fix: upgrade to 4.15.0-1066.75
|
| Ubuntu:Pro:FIPS-updates:18.04:LTS | canonical | linux-gcp-fips |
< 4.15.0-2016.18 Fix: upgrade to 4.15.0-2016.18
|
| Ubuntu:Pro:FIPS:18.04:LTS | canonical | linux-aws-fips | All versions |
| Ubuntu:Pro:FIPS:18.04:LTS | canonical | linux-azure-fips | All versions |
| Ubuntu:Pro:FIPS:18.04:LTS | canonical | linux-fips | All versions |
| Ubuntu:Pro:FIPS:18.04:LTS | canonical | linux-gcp-fips | All versions |
| Ubuntu:20.04:LTS | canonical | linux |
< 5.4.0-77.86 Fix: upgrade to 5.4.0-77.86
|
| Ubuntu:20.04:LTS | canonical | linux-aws |
< 5.4.0-1051.53 Fix: upgrade to 5.4.0-1051.53
|
| Ubuntu:20.04:LTS | canonical | linux-azure |
< 5.4.0-1051.53 Fix: upgrade to 5.4.0-1051.53
|
| Ubuntu:20.04:LTS | canonical | linux-bluefield |
< 5.4.0-1013.16 Fix: upgrade to 5.4.0-1013.16
|
| Ubuntu:20.04:LTS | canonical | linux-gcp |
< 5.4.0-1046.49 Fix: upgrade to 5.4.0-1046.49
|
| Ubuntu:20.04:LTS | canonical | linux-gkeop |
< 5.4.0-1018.19 Fix: upgrade to 5.4.0-1018.19
|
| Ubuntu:20.04:LTS | canonical | linux-kvm |
< 5.4.0-1041.42 Fix: upgrade to 5.4.0-1041.42
|
| Ubuntu:20.04:LTS | canonical | linux-oracle |
< 5.4.0-1048.52 Fix: upgrade to 5.4.0-1048.52
|
Showing 50 of 113. Show the rest
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:20.04:LTS | canonical | linux-raspi |
< 5.4.0-1038.41 Fix: upgrade to 5.4.0-1038.41
|
| 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-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:Pro:FIPS-updates:20.04:LTS | canonical | linux-aws-fips |
< 5.4.0-1069.73+fips2 Fix: upgrade to 5.4.0-1069.73+fips2
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-azure-fips |
< 5.4.0-1073.76+fips1 Fix: upgrade to 5.4.0-1073.76+fips1
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-fips |
< 5.4.0-1028.32 Fix: upgrade to 5.4.0-1028.32
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-gcp-fips |
< 5.4.0-1067.71~20.04.1 Fix: upgrade to 5.4.0-1067.71~20.04.1
|
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-aws-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-azure-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-gcp-fips | 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-azure-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.2 | 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-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.2 | 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-nvidia-6.2 | 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-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-starfive-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.2 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-raspi-realtime | All versions |
| Ubuntu:26.04 | canonical | linux-nvidia | All versions |
| – | linux | linux_kernel |
>= 4.12.0, < 4.14.233 >= 4.15.0, < 4.19.191 >= 4.20.0, < 5.4.118 >= 5.5.0, < 5.10.36 >= 5.11.0, < 5.11.20 >= 5.12.0, < 5.12.3 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Debian:12 | debian | linux |
< 5.10.38-1 Fix: upgrade to 5.10.38-1
|
Original advisory text
In the Linux kernel, the following vulnerability has been resolved: ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure When failing the driver probe because of invalid firmwar...
In the Linux kernel, the following vulnerability has been resolved: ACPI: GTDT: Don't corrupt interrupt mappings on watchdow probe failure When failing the driver probe because of invalid firmware properties, the GTDT driver unmaps the interrupt that it mapped earlier. However, it never checks whether the mapping of the interrupt actially succeeded. Even more, should the firmware report an illegal interrupt number that overlaps with the GIC SGI range, this can result in an IPI being unmapped, and subsequent fireworks (as reported by Dann Frazier). Rework the driver to have a slightly saner behaviour and actually check whether the interrupt has been mapped before unmapping things.
References
- https://ubuntu.com/security/CVE-2021-46953 Third Party Advisory
- https://git.kernel.org/linus/1ecd5b129252249b9bc03d7645a7bda512747277 Third Party Advisory
- https://git.kernel.org/stable/c/c3385a9122f8db15b453e07bfc88117fce7f3724 Third Party Advisory
- https://git.kernel.org/stable/c/7b2162db1498c71962a4bb2f776fa4e76d4d305b Third Party Advisory
- https://git.kernel.org/stable/c/504632a3577a049dd9bb7aabae5b4476f9c586b4 Third Party Advisory
- https://git.kernel.org/stable/c/42e69521ee1fa5abf21f478d147d06bbfe6bf6a8 Third Party Advisory
- https://git.kernel.org/stable/c/596e079c362ac17ed02aa1b99fdc444d62072a01 Third Party Advisory
- https://git.kernel.org/stable/c/1ecd5b129252249b9bc03d7645a7bda512747277 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2021-46953 Third Party Advisory
- https://git.kernel.org/stable/c/e0f2d86481eaa83df33b0793f75212919db7a19d Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-46953 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Timeline
Published27 Feb 2024
Updated4 Nov 2026
First seen12 May 2026
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