CVE-2026-101308

Full vulnerability record from the local CVENow database.
Description

When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer. An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking. An unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges.
Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Analyzed
Source identifier
[email protected]
Published
2026-10-15 07:17:58.007000
Last modified
2026-10-19 21:07:36.683000
View original CVE JSON
{
  "id": "CVE-2026-101308",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-15T07:17:58.007",
  "lastModified": "2026-10-19T21:07:36.683",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer.  An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking.\n\nAn unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges."
    }
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  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
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          "vendor": "FreeBSD",
          "product": "FreeBSD",
          "defaultStatus": "unknown",
          "modules": [
            "sound"
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          "versions": [
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              "version": "15.1-RELEASE",
              "lessThan": "p5",
              "versionType": "release",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:71.sound.asc",
      "source": "[email protected]",
      "tags": [
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        "Vendor Advisory"
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}