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CVE-2026-43109 is an x86 Linux kernel shadow-stack vulnerability in shstk_pop_sigframe(). The function failed to check the return value of mmap_read_lock_killable(), allowing execution to continue when acquisition of the killable mmap read lock failed. The correction handles the error return and marks the relevant mmap-lock interfaces with __must_check to prevent similar unchecked-return defects.
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What an attacker gets, and what they’ve been doing with it.
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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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel x86 shadow-stack flaw involving mmap-lock error handling.
An x86 shadow-stacks flaw involving improper error handling for the mmap lock.
Linux kernel x86 shadow-stacks flaw involving improper mmap-lock error handling.
An x86 shadow-stack issue caused by improper error handling for the mmap lock.
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.