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.
Fix
Patch, vendor advisory and mitigation references on NVD 8
- https://git.kernel.org/stable/c/10a7a702542240d5edb2b39450ac951c59ccd009 Patch
- https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06 Patch
- https://git.kernel.org/stable/c/46e5b71666fb7652082e4e214a3365f4b14f1dc3 Patch
- https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899 Patch
- https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 Patch
- https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117 Patch
- https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a Patch
- https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 2
- CwesCWE-20NVD modified 2026-10-19 19:17
- First seenCVSS 8.8 · linuxNVD modified 2026-10-15 02:18
Affected (CPE criteria) 9
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
References 9
- https://git.kernel.org/stable/c/10a7a702542240d5edb2b39450ac951c59ccd009 Patch
- https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06 Patch
- https://git.kernel.org/stable/c/46e5b71666fb7652082e4e214a3365f4b14f1dc3 Patch
- https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899 Patch
- https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 Patch
- https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117 Patch
- https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a Patch
- https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html