Bluetooth: SCO: hold sk properly in sco_conn_ready

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89774
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:07 UTC
Updated2026-09-16 15:18:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: hold sk properly in sco_conn_ready sk deref in sco_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk and parent sk is currently accessed without either, and without checking parent->sk_state: [Task 1] [Task 2] sco_sock_release sco_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) sco_sock_kill(sk) UAF on sk deref and similarly for access to sco_get_sock_listen() return value. Fix possible UAF by holding sk refcount in sco_conn_ready() and making sco_get_sock_listen() increase refcount. Also recheck after lock_sock that the socket is still valid. Adjust conn->sk locking so it's protected also by lock_sock() of the associated socket if any.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001910000 probability, percentile 0.090430000 (date 2026-09-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f 50aae396dc30377bec8e3b181b8346f8fd38f7d8 git Not specified
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f 6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1 git Not specified
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f d141d9b769bcd1b747898528c5023270cda040f2 git Not specified
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f 73cb063f5ec6ca51eb1e246c6d332563002ac277 git Not specified
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f 7199c78c3a3e399a4dc439d845826793880ccedc git Not specified
CNA Linux Linux affected 27c24fda62b601d6f9ca5e992502578c4310876f 4e37f6452d586b95c346a9abdd2fb80b67794f39 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 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 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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