VulnerabilityPublished 7 Nov 2026

CVE-2026-99271: Linux kernel · ALSA: line6: Clear prev_fbuf on capture buffer release

Source GCVE Database

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Authoritative record:CVE-2026-99271· Medium

Not known to be exploited · fixed in aa118c8f61d59387961d58ffae831c5259a9f222 : update Linux kernel when convenient.

Data as of 7 Nov 2026, 16:17 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in aa118c8f61d59387961d58ffae831c5259a9f222, 862d9268f40a6e10cef24eb226e738fb69ce8aa7, 22c82f33ff0b68d37041adf1dea5533a5863cd31

Exploitation 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 7 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-m889-vhr2-v9vx

What to do

Upgrade Linux kernel to aa118c8f61d59387961d58ffae831c5259a9f222, 862d9268f40a6e10cef24eb226e738fb69ce8aa7 or 22c82f33ff0b68d37041adf1dea5533a5863cd31.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74, < aa118c8f61d59387961d58ffae831c5259a9f222	Fixed in aa118c8f61d59387961d58ffae831c5259a9f222
LinuxLinux	Affected ≥ 63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74, < 862d9268f40a6e10cef24eb226e738fb69ce8aa7	Fixed in 862d9268f40a6e10cef24eb226e738fb69ce8aa7
LinuxLinux	Affected ≥ 63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74, < 22c82f33ff0b68d37041adf1dea5533a5863cd31	Fixed in 22c82f33ff0b68d37041adf1dea5533a5863cd31
LinuxLinux	Affected =4.0	Fixed in–

AI-suggested

A fix is available that clears the stale pointer prev_fbuf and prev_fsize on capture buffer release in the ALSA line6 driver. Users should apply the updated Linux kernel version containing this fix to prevent the use-after-free condition.

Description

A use-after-free vulnerability in the Linux kernel ALSA line6 driver was fixed by clearing a stale pointer on capture buffer release. The flaw involved a slab-use-after-free read in submit_audio_out_urb() when playback started after capture streams were closed, due to a stale pointer not being cleared. This could lead to kernel memory corruption or crashes.

References

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