VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90116: Linux kernel · ALSA: mtpav: shut down output timer before card teardown

Source GCVE Database

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Authoritative record:CVE-2026-90116· High

Not known to be exploited · fixed in de75857ce374671712e1d9528844e3c0543dcef6 : patch Linux kernel soon.

Data as of 30 Oct 2026, 19:18 UTC

Severity

High

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

Thin evidence

One scorer or none

Patch: Available – fixed in de75857ce374671712e1d9528844e3c0543dcef6, c73cb5b7c159246dd572277c668851a56e516019, a9435a1f14a6f9520452617343ea59bb35ba9e79 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 30 Oct 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-f6xw-5hrw-vj32

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < de75857ce374671712e1d9528844e3c0543dcef6	Fixed in de75857ce374671712e1d9528844e3c0543dcef6
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c73cb5b7c159246dd572277c668851a56e516019	Fixed in c73cb5b7c159246dd572277c668851a56e516019
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a9435a1f14a6f9520452617343ea59bb35ba9e79	Fixed in a9435a1f14a6f9520452617343ea59bb35ba9e79
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 793163e134028e7136c9dd9e30f7f656de1eabba	Fixed in 793163e134028e7136c9dd9e30f7f656de1eabba
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 392c985c6b03dfdf4904c0d464f18735ca3c4df8	Fixed in 392c985c6b03dfdf4904c0d464f18735ca3c4df8
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1e16e82581521a2fe20eda29bdc9e75286f7c950	Fixed in 1e16e82581521a2fe20eda29bdc9e75286f7c950

AI-suggested

A fix has been implemented in the Linux kernel to call timer_shutdown_sync() instead of timer_delete() during card teardown, ensuring proper synchronization. Users should update to a Linux kernel version that includes this fix. No other mitigation is required.

Description

A use-after-free race condition was identified and fixed in the ALSA mtpav driver in the Linux kernel. The issue involved the output timer callback potentially accessing card-private state after the card teardown had begun, due to improper synchronization and timer handling. The fix ensures the timer is synchronously shut down before releasing resources, preventing callbacks from running concurrently with teardown.

Impact

The flaw could lead to use-after-free conditions where timer callbacks access freed memory during card teardown, potentially causing kernel crashes or undefined behavior. No evidence of exploitation in the wild is known. The impact is limited to systems running the affected ALSA mtpav driver in the Linux kernel.

Summary

CVE-2026-90116 addresses a synchronization flaw in the ALSA mtpav driver within the Linux kernel. The snd_mtpav_output_timer() function rearmed a timer while holding a spinlock and accessed card-private state. Meanwhile, snd_mtpav_free() took the same lock and called timer_delete() to remove pending timers but did not wait for any currently running callbacks to complete. This allowed a callback running on another CPU to continue after the lock was released, accessing freed card-private state and potentially rearming the timer after deletion. The vulnerability was resolved by replacing timer_delete() with timer_shutdown_sync(), which waits for any running callbacks to finish and prevents further timer rearming before releasing the card-private state, eliminating the race condition.

References

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