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Vulnerability record · CVE-2026-45998 · published 27 May 2026

CVE-2026-45998: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.19% · top 92.6% CWE-416 · Use after freeCWE-825 · CWE-825
7.8CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References
16 Sep 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8 Patch
https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd Patch
https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd Patch
https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495 Patch
https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c Patch
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/errata/RHSA-2026:67721
https://access.redhat.com/errata/RHSA-2026:67723
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

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Source: NIST National Vulnerability Database (record CVE-2026-45998), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.