CVE-2026-45998

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops. Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided. And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8Patch
• https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefdPatch
• https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bdPatch
• https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495Patch
• https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8cPatch
• https://access.redhat.com/errata/RHSA-2026:34911
• https://access.redhat.com/errata/RHSA-2026:55445
• https://access.redhat.com/errata/RHSA-2026:65708