CVE-2024-49864: rxrpc: Fix a race between socket set up and I/O thread creation

Severity: medium (CVSS 4.7 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: 2024-10-21 · updated 2026-08-04
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix a race between socket set up and I/O thread creation In rxrpc_open_socket(), it sets up the socket and then sets up the I/O thread that will handle it. This is a problem, however, as there's a gap between the two phases in which a packet may come into rxrpc_encap_rcv() from the UDP packet but we oops when trying to wake the not-yet created I/O thread. As a quick fix, just make rxrpc_encap_rcv() discard the packet if there's no I/O thread yet. A better, but more intrusive fix would perhaps be to rearrange things such that the socket creation is done by the I/O thread.

Affected products

Linux kernel: from 6.2 through 6.6.55; from 6.10 before 6.10.14; from 6.11 before 6.11.3; 6.12-rc1, 6.12-rc2 — fixed in 6.10.14, 6.11.3

How to fix

Upgrade to a fixed version: Linux kernel 6.10.14, 6.11.3. Check the vendor advisory for mitigations.

References

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