Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

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Summary

CVECVE-2026-31499
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:48 UTC
Updated2026-04-22 14:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ab4eedb790cae44313759b50fe47da285e2519d5 3f26ecbd9cde621dd94be7ef252c7210b965a5c7 git Not specified
CNA Linux Linux affected ab4eedb790cae44313759b50fe47da285e2519d5 d008460de352e534f6721de829b093368564ec66 git Not specified
CNA Linux Linux affected ab4eedb790cae44313759b50fe47da285e2519d5 00fdebbbc557a2fc21321ff2eaa22fd70c078608 git Not specified
CNA Linux Linux affected efc30877bd4bc85fefe98d80af60fafc86e5775e git Not specified
CNA Linux Linux affected f87271d21dd4ee83857ca11b94e7b4952749bbae git Not specified
CNA Linux Linux affected 18ab6b6078fa8191ca30a3065d57bf35d5635761 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/00fdebbbc557a2fc21321ff2eaa22fd70c078608 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f26ecbd9cde621dd94be7ef252c7210b965a5c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d008460de352e534f6721de829b093368564ec66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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