High [CVE-2026-63945] serialize iso_sock_clear_timer with socket lock
This high-severity Red Hat Linux advisory covers CVE-2026-63945 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, Red Hat package: kernel-rt.
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Summary
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. A flaw was found in the Linux kernel's Bluetooth ISO (Isochronous Stream) subsystem.
A race condition exists where the `iso_sock_clear_timer()` function can access connection data without proper locking, while another function, `iso_conn_del()`, concurrently modifies the same data.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- kernel-0:5.14.0-687.47.1.el9_8
- RHSA-2026:67150
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:5.14.0-687.47.1.el9_8, RHSA-2026:67150. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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