CVE-2026-53192 (GCVE-0-2026-53192)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:33
VLAI
Title
ALSA: timer: Fix UAF at snd_timer_user_params()
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Fix UAF at snd_timer_user_params() At releasing a timer object, e.g. when a userspace timer (CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it tries to detach the timer instances and release the resources. However, it's still possible that other in-flight tasks are holding the timer instance where the to-be-deleted timer object is associated, and this may lead to racy accesses. Fortunately, most of ioctls dealing with the timer instance list already have the protection with register_mutex, and this also avoids such races. But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the concurrent ioctl may lead to use-after-free. This patch just adds the guard with register_mutex to protect snd_timer_user_params() for covering the code path as a quick workaround. It's no hot-path but rather a rarely issued ioctl, so the performance penalty doesn't matter.
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
Linux Linux Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 38034d04d4a75bbca01df2b313ced0bcd0fa3242 (git)
Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 3d39da65b5c422c5e5afb7d5651b0698d060a827 (git)
Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 306427adf9b97e29e5958cb9cf3096c6151fc9ff (git)
Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 053a401b592be424fea9d57c789f66cd5d8cec11 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The vulnerable path is reached through local `/dev/snd/timer` ioctls, specifically `SNDRV_TIMER_IOCTL_PARAMS`, after selecting a userspace-driven ALSA timer. It is not reachable by remote network input.\nAC:L - The attacker can create the userspace-driven timer, select it, and race the params ioctl against closing the returned timer fd using their own threads or processes. No external victim state or uncontrollable timing condition is required beyond an attacker-controlled race.\nPR:L - The kernel path has no capability or admin check, but exploitation requires local access to the ALSA timer device as a basic local user. It does not require real root or init-namespace capabilities.\nUI:N - No victim action is required after the attacker has local execution and device access. The attacker can open the timer device, issue ioctls, and close fds directly.\nS:U - The impact is within the same kernel security authority. This is a standard local kernel memory corruption issue, not a VM escape or cross-scope boundary violation.\nC:H - The bug is a use-after-free of a kernel timer object reachable from a user-controlled race. Kernel UAFs can be leveraged for information disclosure through heap reuse and memory manipulation.\nI:H - The stale timer pointer is subsequently dereferenced and used for locking/state decisions, making this kernel heap UAF plausibly exploitable for memory corruption and privilege escalation. Under the required overestimation rule, integrity impact is High.\nA:H - Even without full exploitation, the UAF can dereference or lock freed kernel memory and crash or hang the kernel. Repeated local triggering can therefore cause high availability impact."
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But, SNDRV_TIMER_IOCTL_PARAMS isn\u0027t protected, hence the\\nconcurrent ioctl may lead to use-after-free.\\n\\nThis patch just adds the guard with register_mutex to protect\\nsnd_timer_user_params() for covering the code path as a quick\\nworkaround.  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    "redhat_vex": {
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      "cve": "CVE-2026-53192",
      "id": "CVE-2026-53192",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "260",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: timer: Fix UAF at snd_timer_user_params()",
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:50:21Z",
      "cve": "CVE-2026-53192",
      "id": "CVE-2026-53192",
      "initial_release_date": "2026-06-26T02:10:35Z",
      "product_status:known_not_affected": "236",
      "product_status:recommended": "98",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53192",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53192.json",
      "version": "6"
    }
  }
}



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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

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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.


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