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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-825
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- 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
- https://access.redhat.com/errata/RHSA-2026:65712
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.