Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74540
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:59 UTC
Updated2026-08-15 13:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f1496dee9cbde2a62821f4441dadb0d3360f60c3 fd4c1e301bdec60a40728ea37de531cbccda501a git Not specified
CNA Linux Linux affected f1496dee9cbde2a62821f4441dadb0d3360f60c3 522b730c62c53a1981604fd73524697fd347830d git Not specified
CNA Linux Linux affected f1496dee9cbde2a62821f4441dadb0d3360f60c3 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136 git Not specified
CNA Linux Linux affected f1496dee9cbde2a62821f4441dadb0d3360f60c3 09f447accc2570751e7d17f0dc0788b40d3edade git Not specified
CNA Linux Linux affected f1496dee9cbde2a62821f4441dadb0d3360f60c3 c4740e7f23ff9a8210198d8b4703259e21b9f69d git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* 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-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09f447accc2570751e7d17f0dc0788b40d3edade 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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