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CVE-2026-57589 is a local privilege escalation vulnerability in OpenBSD through 7.9 affecting the System V semaphore subsystem in sys/kern/sysv_sem.c. The flaw is described as a use-after-free in sys_semget() that can occur after tsleep() during a context switch. Available reporting also characterizes the bug as involving an integer overflow condition in the sys_semget() handler that leads to kernel memory corruption. Successful exploitation allows a local user to trigger unsafe reuse of freed kernel memory in semaphore handling and potentially gain root privileges.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
33 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local privilege escalation vulnerability in OpenBSD's System V semaphore handling caused by an integer overflow in sys_semget(), potentially allowing a local user to gain root privileges.
A local privilege escalation vulnerability in OpenBSD's System V semaphore handling, reportedly involving sys_semget(), that could allow obtaining root privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.