Description
In the Linux kernel before 5.3.11, sound/core/timer.c has a use-after-free caused by erroneous code refactoring, aka CID-e7af6307a8a5. This is related to snd_timer_open and snd_timer_close_locked. The timeri variable was originally intended to be for a newly created timer instance, but was used for a different purpose after refactoring.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.3.15-1 | — |
| Debian 13 | linux | 5.3.15-1 | — |
| Debian 12 | linux | 5.3.15-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +5 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-74.84 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1057.59 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1009.10~18.04.1 | USN-4225-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.3 | 5.3.0-1010.11~18.04.1 | USN-4225-1 |
| Ubuntu 18.04 LTS | linux-gcp-edge +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1050.53 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1052.52 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1066.76 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1031.34 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1053.57 | USN-4227-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1070.77 | USN-4227-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1057.59~16.04.1 | USN-4227-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1066.71 | USN-4227-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1052.56 | USN-4227-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-74.83~16.04.1 | USN-4227-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1031.34~16.04.1 | USN-4227-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1066.71~14.04.1 | USN-4227-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-193.13.2.rt13.65.el8_2 | RHSA-2020:3016 |
| RHEL 8 | perf +26 | 4.18.0-193.13.2.el8_2 | RHSA-2020:3010 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.rt56.1131.el7 | RHSA-2020:4062 |
| RHEL 7 | perf +18 | 3.10.0-1160.el7 | RHSA-2020:4060 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.1 EUS | perf +26 | 4.18.0-147.24.2.el8_1 | RHSA-2020:3222 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-193.13.2.el8_2 | ELSA-2020-3010 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.el7 | ELSA-2020-4060 |
Advisories 10
- RHSA-2020:4062 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2020:4060 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2020:3222 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:3016 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:3010 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-4225-1 linux, linux-aws, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-kvm, linux-oracle, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4227-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4227-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ELSA-2020-4060 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-3010 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 24, 2020
References
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11
- https://github.com/torvalds/linux/commit/e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e7af6307a8a54f0b873960b32b6a644f2d0fbd97
- https://security.netapp.com/advisory/ntap-20200103-0001/
- USN-4227-1 vendor-advisory
- USN-4225-1 vendor-advisory
- USN-4227-2 vendor-advisory