Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98107
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:41 UTC
Updated2026-09-30 14:10:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect l2cap_chan_connect() tries to ensure there are no more than L2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the same L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs. However, the check only counts deferred channels. If 6 L2CAP sockets are connected at the same time in order DDDDND (D=deferred, N=non-deferred), the last can bump the total to max+1. It results to one __le16 written out of bounds of the scid array, and an invalid ECRED_CONN_REQ being sent. Fix by leaving room for the non-deferred pending ECRED channels in the counting in l2cap_chan_connect(), so the limit can't be exceeded. Move counting under same critical section where the channel is added. Although race conditions involving this appear unreachable, it's easier to see. Also add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this less brittle.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.054050000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected da49b602f7f75ccc91386e1274b3ef71676cd092 ce0927eb3ee2939fab5ce3f9334bfd2fafb38481 git Not specified
CNA Linux Linux affected da49b602f7f75ccc91386e1274b3ef71676cd092 6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65 git Not specified
CNA Linux Linux affected da49b602f7f75ccc91386e1274b3ef71676cd092 df8c3af6132640da4788e96a02d653e642059803 git Not specified
CNA Linux Linux affected da49b602f7f75ccc91386e1274b3ef71676cd092 56c2b5831d39dc84aad2573dc3e197af1a872a05 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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