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CVE-2026-23395

Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 10a7a702542240d5edb2b39450ac951c59ccd009; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 46e5b71666fb7652082e4e214a3365f4b14f1dc3; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in fb4a3a26483f3ea2cd21c7a2f7c45d5670600465; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 2124d82fd25e1671bb3ceb37998af5aae5903e06; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 6b949a6b33cbdf621d9fc6f0c48ac00915dbf514; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 8d0d94f8ba5b3a0beec3b0da558b9bea48018117; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in e72ee455297b794b852e5cea8d2d7bb17312172a; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 5b3e2052334f2ff6d5200e952f4aa66994d09899

  • Linux Linux

    5.7

  • KernelLinux

    From 5.7.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.20; From 6.19.0 · fixed in 6.19.10

References 8

git.kernel.org