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CVE-2026-74302

Bluetooth: hci_core: Fix UAF in hci_unregister_dev()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.6.160, 4.20, 5.5, 5.11, 5.16, and 5 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: hci_core: Fix UAF in hci_unregister_dev() hci_unregister_dev() does not disable cmd_timer and ncmd_timer before the hci_dev structure is freed. If a timeout fires during device teardown, the callback dereferences freed memory (including the hdev->reset function pointer), leading to a use-after-free. Add disable_delayed_work_sync() calls alongside the existing disable_work_sync() calls to ensure both timers are fully quiesced before teardown proceeds.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From d6cbce18370641a21dd889e8613d8153df15eb39 · fixed in bce2eec05bce548b548aca52c1834540f97d5d60; From 0d151a103775dd9645c78c97f77d6e2a5298d913 · fixed in 48c7ad6afcc58c2cda11fed39791708103b6a644; From 0d151a103775dd9645c78c97f77d6e2a5298d913 · fixed in a0fd1086a57b982f8c24ae4ab165c2af39fe1735; From 0d151a103775dd9645c78c97f77d6e2a5298d913 · fixed in 672d52d9412252e61b8de8d773ccdf5a277cf540; From 0d151a103775dd9645c78c97f77d6e2a5298d913 · fixed in 5edcc018fa6e80b2c478454a4a8229c23d67c181; From 6.6.42 · fixed in 6.6.160; From 4.19.319 · fixed in 4.20; From 5.4.281 · fixed in 5.5; From 5.10.223 · fixed in 5.11; From 5.15.164 · fixed in 5.16; From 6.1.101 · fixed in 6.2; From 6.9.11 · fixed in 6.10

  • Linux Linux

    6.10

  • KernelLinux

    fixed in 6.6.160; From 6.7.0 · fixed in 6.12.97; From 6.10.0 · fixed in 6.18.40; From 6.13.0 · fixed in 7.1.5

References 5

git.kernel.org