CVE-2026-23395
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 10a7a702542240d5edb2b39450ac951c59ccd009 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 46e5b71666fb7652082e4e214a3365f4b14f1dc3 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < fb4a3a26483f3ea2cd21c7a2f7c45d5670600465 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 2124d82fd25e1671bb3ceb37998af5aae5903e06 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 8d0d94f8ba5b3a0beec3b0da558b9bea48018117 | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < e72ee455297b794b852e5cea8d2d7bb17312172a | affected |
| Linux | Linux | 15f02b91056253e8cdc592888f431da0731337b8 < 5b3e2052334f2ff6d5200e952f4aa66994d09899 | affected |
| Linux | Linux | 5.7 | affected |
| Linux | Linux | 0 < 5.7 | unaffected |
| Linux | Linux | 5.10.253 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.203 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.167 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.130 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.78 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.20 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.10 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/10a7a702542240d5edb2b39450ac951c59ccd009
- https://git.kernel.org/stable/c/46e5b71666fb7652082e4e214a3365f4b14f1dc3
- https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465
- https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06
- https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514
- https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117
- https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a
- https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899
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