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Vulnerability record · CVE-2026-23395 · published 25 March 2026

CVE-2026-23395: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.25% · top 85.4%
8.8CVSS 3.1 base score
0.25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-23395), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.