Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63945
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:13 UTC
Updated2026-07-20 15:16:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped: CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */ iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free. Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002050000 probability, percentile 0.107240000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 35f68f36d9883d56dec21cf85f7556d4657fc393 git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 996c2104d0726a8fe584f85b3d6327197374a348 git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a bc08c15746f25f41dd0508b25780d1e84acbb2ef git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5 git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 4b5f8e608749b7e8fa386c6e4301cf9272595859 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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