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ALSA: aloop: Fix racy access at PCM trigger

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop driver tries to check the PCM state and stop the stream of the tied substream in the corresponding cable. Since both check and stop operations are performed outside the cable lock, this may result in UAF when a program attempts to trigger frequently while opening/closing the tied stream, as spotted by fuzzers. For addressing the UAF, this patch changes two things: - It covers the most of code in loopback_check_format() with cable->lock spinlock, and add the proper NULL checks. This avoids already some racy accesses. - In addition, now we try to check the state of the capture PCM stream that may be stopped in this function, which was the major pain point leading to UAF.

Announced Source revision 1
Original source ↗

CVE-2026-23191

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23191

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "f57467114f40c5aacebbea96fb4ff9e5cd2b7f18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "c99be0d5af02adebe9cb6f9869d20397fa9935a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "f3ce8be893726899e3053cf8059ecc95d8410359",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "0e6245b2424d126ac90018142d09f0707e12998b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "bad15420050db1803767e58756114800cce91ea4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "5727ccf9d19ca414cb76d9b647883822e2789c2e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b1c73fc8e697eb73e23603e465e9af2711ed4183",
        "lessThan": "826af7fa62e347464b1b4e0ba2fe19a92438084f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "sound/drivers/aloop.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.37"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.37",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.70",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/drivers/aloop.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23191

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39777 · Revision 1
Added to Heist Feed
Publisher date
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