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CVE-2026-31408

Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.203, 6.1.168, 6.6.131, 6.12.80, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d57384e27d1ebf0047e3f00a6e1181b8be9857a2; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in b0a7da0e3f7442545f071499beb36374714bb9de; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 108b81514d8f2535eb16651495cefb2250528db3; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in e76e8f0581ef555eacc11dbb095e602fb30a5361; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 598dbba9919c5e36c54fe1709b557d64120cb94b

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.131; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 8

git.kernel.org