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CVE-2026-31408 is a use-after-free vulnerability in the Linux kernel Bluetooth SCO (Synchronous Connection-Oriented) subsystem, in net/bluetooth/sco.c. The flaw is in sco_recv_frame(), which reads conn->sk while holding sco_conn_lock() but releases the lock without first retaining a reference to the socket. A concurrent close() can free the socket after the lock is dropped and before subsequent access to sk->sk_state, creating a race that results in use-after-free. The upstream fix takes a socket reference with sco_sock_hold() before releasing the lock and adds sock_put() on all exit paths. The issue is associated with improper reference-count handling and has been reported as present since Linux 2.6.12.
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A Linux kernel Bluetooth SCO use-after-free vulnerability in sco_recv_frame() caused by a missing sock_hold.
Linux kernel Bluetooth SCO use-after-free vulnerability in sco_recv_frame() caused by a missing sock_hold.
A Linux kernel Bluetooth SCO use-after-free vulnerability in sco_recv_frame() caused by a missing sock_hold reference.
A Linux kernel Bluetooth SCO use-after-free vulnerability in sco_recv_frame() caused by a missing sock_hold.
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.