Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90092
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:00 UTC
Updated2026-09-18 18:17:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN New sk should not be added to parent socket accept queue after last l2cap_sock_cleanup_listen() has run in l2cap_sock_teardown_cb() and state set to BT_CLOSED, as that can result to UAF on dereferencing the dangling parent reference. l2cap_sock_new_connection_cb() may race with parent l2cap_chan teardown, due to chan->state accessed without consistent locking: [Task 1] [Task 2] l2cap_sock_release(parent) l2cap_connect l2cap_sock_shutdown pchan = l2cap_global_chan_by_psm l2cap_chan_lock(pchan) l2cap_chan_close l2cap_sock_teardown_cb pchan->state = BT_CLOSED l2cap_chan_unlock(pchan) ------> l2cap_chan_lock(pchan) l2cap_new_connection l2cap_sock_new_connection_cb l2cap_chan_lock(pchan) <-------- l2cap_chan_unlock(pchan) l2cap_sock_kill(parent) /* bt_sk(sk)->parent dangling */ Fix by adding check for sk_state == BT_LISTEN after acquiring sk lock in l2cap_sock_new_connection_cb(). Add lock_sock() around sk_state writes where missing, to avoid data races. Although the data races on pchan->state should be fixed too, this defensive sk_state check probably makes sense in any case.

Risk And Classification

Primary CVSS: v3.1 8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.003520000 probability, percentile 0.289180000 (date 2026-09-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8HIGHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8HIGHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0c17c8832562b2aac288e89cefd0f46074f54bcb bf61a65c6093970e3b50031c4b79ebf3bd411eba git Not specified
CNA Linux Linux affected 5105f3e6b2df619c635b5f6a49fac131a36c7952 491e4c60017969b053888029998d2a61f298986a git Not specified
CNA Linux Linux affected c88c185ae0a1067823661b220aeea613df2c127b 2a3a27aaf19bf069720e024ce6fde54e6bf80df9 git Not specified
CNA Linux Linux affected 1810e42ff6716f320c7269d5850eca48b07b7427 87276dc15b559d32757a43b4415c8445fbae06c4 git Not specified
CNA Linux Linux affected 2ff1a41a912de8517b4482e946dd951b7d80edbf c47339e169bf4a0a4cfabb91351471f67744c2bc git Not specified
CNA Linux Linux affected 2ff1a41a912de8517b4482e946dd951b7d80edbf d4bfa78fd67929b62b02013c107973e0c5b7aa9a git Not specified
CNA Linux Linux affected 1b1c0da227bf63479bac9982fc8d12df9aaea0fb git Not specified
CNA Linux Linux affected 85426e97dc72f2088ba6d27e74cd58c3fbd43e31 git Not specified
CNA Linux Linux affected a2dcf1a61d056aef15b63c6eae9441344d624389 git Not specified
CNA Linux Linux affected 6.1.175 6.1.188 semver Not specified
CNA Linux Linux affected 6.6.140 6.6.157 semver Not specified
CNA Linux Linux affected 6.12.88 6.12.110 semver Not specified
CNA Linux Linux affected 6.18.30 6.18.52 semver Not specified
CNA Linux Linux affected 5.10.258 5.11 semver Not specified
CNA Linux Linux affected 5.15.209 5.16 semver Not specified
CNA Linux Linux affected 7.0.7 7.1 semver Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c47339e169bf4a0a4cfabb91351471f67744c2bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/491e4c60017969b053888029998d2a61f298986a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/87276dc15b559d32757a43b4415c8445fbae06c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf61a65c6093970e3b50031c4b79ebf3bd411eba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2a3a27aaf19bf069720e024ce6fde54e6bf80df9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d4bfa78fd67929b62b02013c107973e0c5b7aa9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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