CVE-2026-63945

CVE CVE-2026-63945EUVD EUVD-2026-45718Published 2026-07-19T14:55:39.000ZLast changed 2026-08-05T12:37:32.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped: CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */ iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free. Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux ccf74f2390d60a2f9a75ef496d2564abb478f46a <996c2104d0726a8fe584f85b3d6327197374a348; patch: 6.1.176; ccf74f2390d60a2f9a75ef496d2564abb478f46a <35f68f36d9883d56dec21cf85f7556d4657fc393; ccf74f2390d60a2f9a75ef496d2564abb478f46a <d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa; patch: 6.6.143; ccf74f2390d60a2f9a75ef496d2564abb478f46a <51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5; ccf74f2390d60a2f9a75ef496d2564abb478f46a <bc08c15746f25f41dd0508b25780d1e84acbb2ef; patch: 6.18.35; patch: 7.0.12; patch: 7.1; ccf74f2390d60a2f9a75ef496d2564abb478f46a <4b5f8e608749b7e8fa386c6e4301cf9272595859; patch: 0; patch: 6.12.93; 6.0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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