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CVE-2026-63948

Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 4.20, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn __set_chan_timer() takes a l2cap_chan reference via l2cap_chan_hold() before scheduling the delayed work. The normal path in l2cap_chan_timeout() drops this reference with l2cap_chan_put() at the end, but the early return when chan->conn is NULL skips the put, leaking the reference. Add the missing l2cap_chan_put() before the early return.

Timeline

  1. CVE published

Affected versions

  • Linux Linux

    From 5.10.217 · fixed in 5.10.259; From 5.15.159 · fixed in 5.15.210; From 6.1.91 · fixed in 6.1.176; From 6.6.31 · fixed in 6.6.143; From 4.19.314 · fixed in 4.20; From 5.4.276 · fixed in 5.5; From 6.8.10 · fixed in 6.9

  • Linux Linux

    6.9

References 8

git.kernel.org