CVE-2026-58087 - Heap out-of-bounds access in semctl(2)

CVE-2026-58087 - Heap out-of-bounds access in semctl(2)

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/19/2026 - 10:27
CVE ID :CVE-2026-58087
Published : Aug. 19, 2026, 7:47 a.m. | 13 minutes ago
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.
Severity: 0.0 | NA
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