Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64206
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-20 17:18:22 UTC
Updated2026-07-20 17:18:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 d5616beb3355b5fca2280d796c1cf7ada4ee6551 git Not specified
CNA Linux Linux affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 e96fbac8d3a73b0bc165383c092a30628561d320 git Not specified
CNA Linux Linux affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 2641a9e0a1dd4af2e21995470a21d55dd35e5203 git Not specified
CNA Linux Linux affected ee805f9499ebd0edf0877990968543c752043b59 git Not specified
CNA Linux Linux affected 3.15.5 3.16 semver Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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