CVE-2026-74339: Linux kernel · ALSA: seq: Clear variable event pointer on read
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +41
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
An official fix is available and should be applied. The vulnerability was resolved by clearing the temporary event pointer before copying data to userspace in the ALSA sequencer code. Users should update their Linux kernel to a patched version to mitigate this issue.
Description
A vulnerability in the Linux kernel ALSA sequencer subsystem was resolved that involved improper clearing of a temporary event pointer during the read operation. This flaw could allow a local userspace sequencer client to read kernel memory addresses related to extension cells. The issue was fixed by clearing the temporary header pointer before copying data to userspace, preventing leakage of kernel addresses. The original queued event remains unchanged and is safely processed after the fix.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74339 (opens in a new tab)
- git.kernel.org/stable/c/14fe4f75fd5309d6b75f8e840ada88912b374207 (opens in a new tab)
- git.kernel.org/stable/c/6b52211eba213c461f68922708a99d8190c1fcd5 (opens in a new tab)
- git.kernel.org/stable/c/705dd6dcbc0ea87351c660c1a6443f85f1001c76 (opens in a new tab)
- git.kernel.org/stable/c/74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b (opens in a new tab)
- git.kernel.org/stable/c/c2ac9287e89916da684c2a548798351e63eb59ee (opens in a new tab)
- git.kernel.org/stable/c/e0c3edd86414534cfd179fefe45b38c29c01ae7a (opens in a new tab)
- git.kernel.org/stable/c/f29243c211928114f8b906e0a3fee77c236f14c8 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74339 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74339 (opens in a new tab)
- git.kernel.org/linus/705dd6dcbc0ea87351c660c1a6443f85f1001c76 (opens in a new tab)
- ubuntu.com/security/notices/USN-8876-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)