CVE-2026-58087
The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, alloca
CVSS
7.8
Alto
EPSS
0.2%
p8
KEV
—
Exploit Today
2
0-100
Publicado: 19 ago 2026 · Última mod.: 20 ago 2026 · CWE-125 · CWE-191 · CWE-787
Sin historial EPSS suficiente todavía.
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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