Description
The snd_timer_interrupt function in sound/core/timer.c in the Linux kernel before 4.4.1 does not properly maintain a certain linked list, which allows local users to cause a denial of service (race condition and system crash) via a crafted ioctl call.
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 | 4.4.2-1 | — |
| Debian 13 | linux | 4.4.2-1 | — |
| Debian 12 | linux | 4.4.2-1 | — |
| Debian 8 | linux | 3.16.7-ckt20-1+deb8u4 | DSA-3503-1 |
| Debian 7 | linux | 3.2.73-2+deb7u3 | DSA-3503-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-riscv +6 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +4 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +3 | No fix yet | — |
| Ubuntu 14.04 LTS | linux | 3.13.0-83.127 | USN-2929-1 |
| Ubuntu 14.04 LTS | linux-lts-utopic | 3.16.0-67.87~14.04.1 | USN-2931-1 |
| Ubuntu 14.04 LTS | linux-lts-vivid | 3.19.0-56.62~14.04.1 | USN-2932-1 |
| Ubuntu 14.04 LTS | linux-lts-wily | 4.2.0-30.35~14.04.1 | USN-2930-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | kernel-docs | 3.0.101-71.2 | SUSE-SU-2016:0911-1 |
| SLES 11 SP4 | kernel-ec2 +7 | 3.0.101-71.1 | SUSE-SU-2016:0911-1 |
| SLES 11 SP3 | kernel-ec2 +7 | 3.0.101-0.47.79.1 | SUSE-SU-2016:1203-1 |
| SLES 11 SP2 | kernel-ec2 +6 | 3.0.101-0.7.40.1 | SUSE-SU-2016:2074-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | kernel-ec2 +7 | 3.0.101-71.1 | SUSE-SU-2016:0911-1 |
| SLE Real Time 11 SP4 | kernel-rt +3 | 3.0.101.rt130-51.1 | SUSE-SU-2016:1102-1 |
| SUSE OpenStack Cloud 5 | kernel-ec2 +6 | 3.0.101-0.47.79.1 | SUSE-SU-2016:1203-1 |
| SUSE Manager Proxy 2.1 | kernel-ec2 +6 | 3.0.101-0.47.79.1 | SUSE-SU-2016:1203-1 |
| SUSE Manager 2.1 | kernel-ec2 +6 | 3.0.101-0.47.79.1 | SUSE-SU-2016:1203-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.21.4.el6uek | 0.4.5-3.el6 | ELSA-2018-4134 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.21.4.el7uek | 0.4.5-3.el7 | ELSA-2018-4134 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.21.4.el7uek | ELSA-2018-4134 |
Advisories 11
- USN-2929-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3503-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2930-2 linux-lts-wily vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-2931-1 linux-lts-utopic vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-2932-1 linux-lts-vivid vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2016:0911-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2074-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1203-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1102-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0151 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 17, 2024
- ELSA-2018-4134 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 15, 2018
References
- https://github.com/torvalds/linux/commit/ee8413b01045c74340aa13ad5bdf905de32be736
- USN-2930-1 vendor-advisory
- USN-2967-1 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.1
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ee8413b01045c74340aa13ad5bdf905de32be736
- USN-2930-2 vendor-advisory
- DSA-3503 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1311560
- USN-2967-2 vendor-advisory
- [oss-security] 20160119 Security bugs in Linux kernel sound subsystem mailing-list
- USN-2930-3 vendor-advisory
- SUSE-SU-2016:1102 vendor-advisory
- USN-2929-1 vendor-advisory
- USN-2932-1 vendor-advisory
- 1035296 vdb-entry
- SUSE-SU-2016:2074 vendor-advisory
- USN-2931-1 vendor-advisory
- 83381 vdb-entry
- USN-2929-2 vendor-advisory
- SUSE-SU-2016:0911 vendor-advisory