Heap out-of-bounds access in semop(2)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-58098
StatePUBLISHED
Assignerfreebsd
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 07:18:02 UTC
Updated2026-10-16 04:18:32 UTC
DescriptionWhen 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.

Risk And Classification

Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FreeBSD FreeBSD affected 15.1-RELEASE p4 release Not specified
CNA FreeBSD FreeBSD affected 15.0-RELEASE p14 release Not specified
CNA FreeBSD FreeBSD affected 14.5-RELEASE p1 release Not specified
CNA FreeBSD FreeBSD affected 14.4-RELEASE p10 release Not specified

References

ReferenceSourceLinkTags
security.freebsd.org/advisories/FreeBSD-SA-26:64.sysvsem.asc [email protected] security.freebsd.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Reo Shiseki (en)

CNA: Andrew Griffiths (en)

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