CVE-2026-58098
CVE-2026-58098 · Heap out-of-bounds access in semop(2)
This page contains facts from public vulnerability sources. Check the original advisory before updating.
When semop(2) blocks waiting for a semaphore condition, it releases the per-set lock and sleeps. Upon waking, it checks the sequence number embedded in the semaphore set's IPC identifier to detect whether the set was removed while the caller was asleep. This sequence number is only 15 bits wide. If enough semaphore sets are created and destroyed in the same table slot while a caller is blocked, the counter wraps around, and semop(2) may falsely conclude that the original set still exists. The subsequent access to a semaphore within the set may then be out of bounds. An unprivileged local user can trigger an out-of-bounds access on kernel heap memory, potentially leading to privilege escalation.
CVSS 8.4 · High · EPSS 0.2%
- Published
- Updated
Affected products and versions
freebsd
- Versions
- ≥ 15.1-RELEASE, < p4: Affected (release)
- ≥ 15.0-RELEASE, < p14: Affected (release)
- ≥ 14.5-RELEASE, < p1: Affected (release)
- ≥ 14.4-RELEASE, < p10: Affected (release)
No fix published