UBUNTU-CVE-2026-45998
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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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17 explicit affected versions
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1 explicit affected versions
5 explicit affected versions
13 explicit affected versions
43 explicit affected versions
11 explicit affected versions
10 explicit affected versions
8 explicit affected versions
43 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
12 explicit affected versions
11 explicit affected versions
1 explicit affected versions
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37 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/1f2740150f904bfa60e4bad74d65add3ccb5e7f8
- https://ubuntu.com/security/CVE-2026-45998
- https://ubuntu.com/security/notices/USN-8370-1
- https://ubuntu.com/security/notices/USN-8371-1
- https://ubuntu.com/security/notices/USN-8373-1
- https://ubuntu.com/security/notices/USN-8374-1
- https://ubuntu.com/security/notices/USN-8393-1
- https://ubuntu.com/security/notices/USN-8440-1
- https://ubuntu.com/security/notices/USN-8461-1
- https://ubuntu.com/security/notices/USN-8489-1
- https://ubuntu.com/security/notices/USN-8497-1
- https://ubuntu.com/security/notices/USN-8499-1
- https://ubuntu.com/security/notices/USN-8569-1
- https://www.cve.org/CVERecord?id=CVE-2026-45998