CVE-2026-99271: Linux kernel · ALSA: line6: Clear prev_fbuf on capture buffer release
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 10 Nov 2026, 07:17 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 7 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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
A fix has been implemented that clears the prev_fbuf and prev_fsize pointers during capture buffer release to prevent use-after-free access. Users should apply the updated Linux kernel versions that include this fix. No additional mitigations are indicated.
Description
A use-after-free vulnerability was identified and fixed in the ALSA line6 driver in the Linux kernel. The issue occurs because a stale pointer (prev_fbuf) is not cleared when the capture buffer is released, leading to a slab-use-after-free read when playback is subsequently started. This flaw could cause kernel memory corruption or instability.
References
- ubuntu.com/security/CVE-2026-99271 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99271 (opens in a new tab)
- git.kernel.org/stable/c/22c82f33ff0b68d37041adf1dea5533a5863cd31 (opens in a new tab)
- git.kernel.org/stable/c/862d9268f40a6e10cef24eb226e738fb69ce8aa7 (opens in a new tab)
- git.kernel.org/stable/c/aa118c8f61d59387961d58ffae831c5259a9f222 (opens in a new tab)