Bluetooth: ISO: fix leaking sk after socket release

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74536
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:58 UTC
Updated2026-08-17 06:19:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix leaking sk after socket release iso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || sock_flag(sk, SOCK_DEAD) for early return, but this is always true since sock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket always leaks, iso_sock_destruct is never called. The socket reference also leaks when __iso_sock_close() does not set SOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after zapping. Fix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for something else, and lock_sock to ensure iso_sock_kill() puts sk only after socket release only once. Release and iso_conn_del may run concurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up after zapping. Remove call to iso_sock_kill() from iso_sock_close(), as it's generally no-op there.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.064900000 (date 2026-08-16)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 96ed3c772c08e7a91c399567f412618e43231023 git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a e76a0ae6542ae43241b2147bacf4990e7ae5316a git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a e30e5ca63c8fbe3cd505fbb419bb547760cda633 git Not specified
CNA Linux Linux affected ccf74f2390d60a2f9a75ef496d2564abb478f46a ce57442a379212fe3fda59c9437ee8217eceb5b1 git Not specified
CNA Linux Linux affected 6.0 Not specified
CNA Linux Linux unaffected 6.0 semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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