Linux kernel AF_Unix use-after-free flaw enables container escape

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A security vulnerability tracked as CVE-2026-53361 has been disclosed affecting the Linux kernel's AF_Unix socket implementation. The flaw involves a use-after-free condition arising from a race between the garbage collector and the MSG_PEEK socket operation. This class of vulnerability can allow an attacker to escape container isolation, potentially gaining elevated privileges on the host system. Details and proof-of-concept code have been published on GitHub by researcher sgkdev. The disclosure is currently attracting attention in the security community via Hacker News.

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