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.

Affected Software

Weaknesses

ADP Enrichment

kernel: rxrpc: Fix potential UAF after skb_unshare() failure

Additional References

• https://access.redhat.com/security/cve/CVE-2026-45998
• https://bugzilla.redhat.com/show_bug.cgi?id=2482024
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json
• https://access.redhat.com/errata/RHSA-2026:34911

References

• https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c
• https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495
• https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd
• https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd
• https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8

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