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Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.

PUBLISHED Reserved 2026-01-13 | Published 2026-03-25 | Updated 2026-05-11 | Assigner Linux




HIGH: 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Product status

Default status
unaffected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 10a7a702542240d5edb2b39450ac951c59ccd009
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 46e5b71666fb7652082e4e214a3365f4b14f1dc3
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before fb4a3a26483f3ea2cd21c7a2f7c45d5670600465
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 2124d82fd25e1671bb3ceb37998af5aae5903e06
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 8d0d94f8ba5b3a0beec3b0da558b9bea48018117
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before e72ee455297b794b852e5cea8d2d7bb17312172a
affected

15f02b91056253e8cdc592888f431da0731337b8 (git) before 5b3e2052334f2ff6d5200e952f4aa66994d09899
affected

Default status
affected

5.7
affected

Any version before 5.7
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.167 (semver)
unaffected

6.6.130 (semver)
unaffected

6.12.78 (semver)
unaffected

6.18.20 (semver)
unaffected

6.19.10 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/10a7a702542240d5edb2b39450ac951c59ccd009

git.kernel.org/...c/46e5b71666fb7652082e4e214a3365f4b14f1dc3

git.kernel.org/...c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465

git.kernel.org/...c/2124d82fd25e1671bb3ceb37998af5aae5903e06

git.kernel.org/...c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514

git.kernel.org/...c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117

git.kernel.org/...c/e72ee455297b794b852e5cea8d2d7bb17312172a

git.kernel.org/...c/5b3e2052334f2ff6d5200e952f4aa66994d09899

cve.org (CVE-2026-23395)

nvd.nist.gov (CVE-2026-23395)

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