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CVE-2026-101308

TOCTOU race between sound(4) buffer resizing and mmap

Medium5.5EPSS 0.07%
Published
Updated
Reserved
Assigned by
freebsd

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.

Scores

CVSS scores of CVE-2026-101308, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.07% · top 100% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.1-RELEASE – < p5
    • affected 14.5-RELEASE – < p2
    • affected 14.4-RELEASE – < p11

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .