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CVE-2026-45998

7.8 · HIGH

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 rx…

Published May 27, 2026CWE-416EPSS 0.19%

Overview

CVE-2026-45998 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8Refgit.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefdRefgit.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bdRefgit.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495Refgit.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8cRefaccess.redhat.com/errata/RHSA-2026:34911Refaccess.redhat.com/errata/RHSA-2026:55445Refaccess.redhat.com/security/cve/CVE-2026-45998Refbugzilla.redhat.com/show_bug.cgi?id=2482024Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45998.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45998?

CVE-2026-45998 is a high-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-45998?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45998?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45998?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45998 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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