CVE-2025-38514: rxrpc: Fix oops due to non-existence of prealloc backlog struct

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-16 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix oops due to non-existence of prealloc backlog struct If an AF_RXRPC service socket is opened and bound, but calls are preallocated, then rxrpc_alloc_incoming_call() will oops because the rxrpc_backlog struct doesn't get allocated until the first preallocation is made. Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no backlog struct. This will cause the incoming call to be aborted.

Affected products

Debian Linux: 11.0
Linux kernel: from 4.9 before 5.4.296; from 5.5 before 5.10.240; from 5.11 before 5.15.189; from 5.16 before 6.1.146; from 6.2 before 6.6.99; from 6.7 before 6.12.39 — fixed in 5.10.240, 5.15.189, 5.4.296, 6.1.146, 6.12.39, 6.15.7

How to fix

Upgrade to a fixed version: Linux kernel 5.10.240, 5.15.189, 5.4.296, 6.1.146. Check the vendor advisory for mitigations.

References

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