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CVE-2025-38236 is a use-after-free vulnerability in the Linux kernel AF_UNIX implementation for stream UNIX domain sockets, affecting Linux kernels from 6.9 onward according to the available information. The flaw is in out-of-band data handling during recv operations, specifically in the interaction between unix_stream_read_generic(), unix_stream_recv_urg(), and OOB skb queue management in net/unix/af_unix.c. When multiple out-of-band messages are sent and consumed in sequence, the receive queue can retain consecutive consumed OOB skbs as boundary markers. A subsequent normal recv() can traverse these zero-length consumed OOB skbs unexpectedly through logic associated with SO_PEEK_OFF handling, advance to a live OOB skb, and free it. A later recv() with MSG_OOB can then access the already freed skb, triggering a slab use-after-free. The issue also causes incorrect SIOCATMARK behavior in the presence of consecutive consumed OOB skbs. The fix removes the problematic queue state by freeing a previous consumed OOB skb when receiving a new OOB skb, preventing consecutive consumed OOB skbs from being left on the receive queue.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
High-severity kernel elevation-of-privilege issue in Net/EPoll subsystems referenced as part of the December 2025 Android bulletin’s kernel bug set.
High-severity Android kernel vulnerability referenced in the December 2025 bulletin as expanding the local kernel privilege-escalation attack surface.
Linux kernel use-after-free bug in stream-oriented UNIX domain sockets’ MSG_OOB handling (Linux >= 6.9), discussed in the context of exploitation from the Chrome renderer sandbox.
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.