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CVE-2026-58087

7.8 Élevée

Publiée le 19/08/2026 à 10:17 · Modifiée le 31/08/2026 à 17:07 · Analysée par le NVD · Source : secteam@freebsd.org

Description

The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized for that count, and reacquired the lock. A sequence-number check was used to verify that the set had not been replaced in the interim, but the sequence number wraps after 0x8000 create/destroy cycles. By rapidly destroying and recreating semaphore sets at the same index, another process can cause the sequence number to wrap, allowing a set with a different number of semaphores to pass validation. The subsequent copy then reads or writes past the end of the allocated buffer. An unprivileged local user can trigger out-of-bounds reads and writes on kernel heap memory, potentially leading to privilege escalation.

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Produits concernés

Scores CVSS

VersionScoreSourceVecteur
3.1 7.8 Élevée 134c704f-9b21-4f2e-91b3-4a467353bcc0 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Faiblesses (CWE)

Références

Ailleurs