Bluetooth: fix UAF in bt_accept_dequeue()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64406
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:24 UTC
Updated2026-07-27 05:16:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

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: 0.002740000 probability, percentile 0.195570000 (date 2026-07-27)

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 751de6ec671fe75ad9cf65a0638d2a06b6a5984d c0577c55219be42b6ea2ea8db11e85bfab6f4e8d git Not specified
CNA Linux Linux affected 407217734835d21d4e0105ebf347860dc1806f88 96ad400d5132eb333f28f6f1e2d58f0728ca9547 git Not specified
CNA Linux Linux affected 7eebd4c2c86f573af87ff165d08a83432eb0b919 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0 git Not specified
CNA Linux Linux affected 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 c66a95e60b65d876a927123b0ed36bd6177d9ca6 git Not specified
CNA Linux Linux affected 87c543e2f78d0871f271df92dab98901bbd5b6f5 6303ed4bbe0095f4cc195225479bf506e010d1db git Not specified
CNA Linux Linux affected added1213395071470a900cc845a042fb51882a6 26168db1ce5a9766cde021b18e590a101c056614 git Not specified
CNA Linux Linux affected ab1513597c6cf17cd1ad2a21e3b045421b48e022 50c662bdcd51b03033a0abed6716bfd377ba1049 git Not specified
CNA Linux Linux affected ab1513597c6cf17cd1ad2a21e3b045421b48e022 4bd0b274054f2679f28b70222b607bb0afc3ab9a git Not specified
CNA Linux Linux affected a5ca86a6097a8b030ca3226cd300b17ed330f966 git Not specified
CNA Linux Linux affected 5.10.259 5.10.261 semver Not specified
CNA Linux Linux affected 5.15.210 5.15.212 semver Not specified
CNA Linux Linux affected 6.1.175 6.1.178 semver Not specified
CNA Linux Linux affected 6.6.142 6.6.145 semver Not specified
CNA Linux Linux affected 6.12.92 6.12.96 semver Not specified
CNA Linux Linux affected 6.18.34 6.18.39 semver Not specified
CNA Linux Linux affected 7.0.11 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 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* 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/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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