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CVE-2026-57589 is a use-after-free vulnerability in OpenBSD's System V semaphore implementation, specifically in sys/kern/sysv_sem.c through OpenBSD 7.9. The flaw is described as a context-switch-triggered use-after-free after tsleep in sys_semget(). This indicates that during semaphore acquisition/creation handling in sys_semget(), execution can sleep and later resume with a stale reference to memory that has already been freed, creating a kernel memory safety condition. Because the bug is in kernel code handling IPC semaphores, successful exploitation can corrupt kernel state and enable privilege escalation.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
16 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.