Medium [CVE-2026-63948] fix chan ref leak in l2cap_chan_timeout on !conn
This medium-severity Red Hat Linux advisory covers CVE-2026-63948 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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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.
A flaw was found in the Linux kernel's Bluetooth Logical Link Control and Adaptation Protocol (L2CAP) component. When a channel's connection is null, an early exit path in the function fails to release a held channel reference.
This oversight can lead to resource exhaustion over time, potentially causing system instability or a Denial of Service (DoS). This vulnerability is rated as having a Moderate impact because exploitation requires local access and is confined to denial of service through resource exhaustion, leaving system confidentiality and integrity intact.
Typical enterprise deployments of Red Hat Enterprise Linux do not utilize Bluetooth devices or maintain active Bluetooth networking, which minimizes exposure under standard server configurations.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 7 days ago·verify at source
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