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CVE-2026-31532 is a use-after-free vulnerability in the Linux kernel Controller Area Network (CAN) raw socket subsystem, in net/can/raw.c. The flaw arises from an RCU lifetime mismatch during socket teardown: raw_release() unregisters CAN receive filters through can_rx_unregister(), but receiver deletion is deferred via call_rcu(). During this window, raw_rcv() can still execute inside an RCU read-side critical section after raw_release() has already freed the per-CPU ro->uniq storage, resulting in a use-after-free of that percpu memory. The upstream fix moves free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor so the memory is only released after the relevant RCU callbacks have drained.
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34 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel use-after-free vulnerability in SocketCAN CAN_RAW sockets caused by a race between raw_release() and raw_rcv(), allowing concurrent access to freed per-CPU uniq state and potentially enabling local privilege escalation via kernel memory corruption.
A use-after-free vulnerability in the Linux kernel CAN module mentioned as prior context from an earlier part of the series.
A race-condition use-after-free vulnerability in the Linux kernel net/can subsystem.
A Linux kernel CAN raw subsystem use-after-free vulnerability in raw_rcv().
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.