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CVE-2026-43126 (GCVE-0-2026-43126)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-08-05 12:26
VLAI
Title
ALSA: mixer: oss: Add card disconnect checkpoints
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: mixer: oss: Add card disconnect checkpoints ALSA OSS mixer layer calls the kcontrol ops rather individually, and pending calls might be not always caught at disconnecting the device. For avoiding the potential UAF scenarios, add sanity checks of the card disconnection at each entry point of OSS mixer accesses. The rwsem is taken just before that check, hence the rest context should be covered by that properly.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ae583f113d15fa97e5234133c20d09f8e6214e47 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e6645e625480cdf1079a4265f758d13b70721029 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8c097cf736993454acf3f711a3b376d6c7ad8965 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 084d5d44418148662365eced3e126ad1a81ee3e2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - The vulnerable OSS mixer kcontrol paths are reached through local ioctl operations on `/dev/mixer*` or forwarded OSS PCM mixer ioctls. The disconnect side can be induced in a reasonable hotpluggable sound-device scenario while the attacker drives repeated local ioctls.\nAC:L - This is a race, but a local attacker can repeatedly issue mixer ioctls and, in hotplug deployments, control or repeatedly induce the disconnect event. There is no rare memory layout or victim state prerequisite needed to trigger the vulnerable path.\nPR:L - The attacker needs local access to an ALSA OSS mixer or PCM device node, but no kernel capability or real root privilege is checked in the ioctl path. This is basic unprivileged local access where device permissions grant audio-device use.\nUI:N - No victim interaction is required once the attacker can run the local ioctl workload and induce the disconnect condition. The attacker controls the operations needed for exploitation.\nS:U - The vulnerability is in kernel sound-card handling and impacts the same kernel security authority. It is a standard local kernel compromise or crash scenario, not a VM, IOMMU, or other scope-crossing boundary.\nC:H - The fix explicitly addresses potential use-after-free scenarios when OSS mixer code invokes kcontrol callbacks after card shutdown. Per kernel UAF scoring guidance, this can be leveraged for high-impact information disclosure.\nI:H - The stale kcontrol callback path can operate on freed or disconnected driver state, making this a use-after-free class memory corruption issue. UAF exploitation can provide write/control-flow primitives, so integrity impact is high.\nA:H - Even without full exploitation, invoking kcontrol callbacks after disconnect can dereference freed or invalid device state and crash the kernel. A kernel oops or panic is high availability impact."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.