Linux Kernel Bluetooth SCO UAF via missing sock_hold
CVE-2026-31408 Published on April 6, 2026
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately
releases the lock without holding a reference to the socket. A concurrent
close() can free the socket between the lock release and the subsequent
sk->sk_state access, resulting in a use-after-free.
Other functions in the same file (sco_sock_timeout(), sco_conn_del())
correctly use sco_sock_hold() to safely hold a reference under the lock.
Fix by using sco_sock_hold() to take a reference before releasing the
lock, and adding sock_put() on all exit paths.
Products Associated with CVE-2026-31408
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 108b81514d8f2535eb16651495cefb2250528db3 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below e76e8f0581ef555eacc11dbb095e602fb30a5361 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 598dbba9919c5e36c54fe1709b557d64120cb94b is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 6.6.131, <= 6.6.* is unaffected.
- Version 6.12.80, <= 6.12.* is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0-rc6, <= * is unaffected.