What is CVE-2026-45873?

CVE-2026-45873 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.10.166 onward and patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-45873 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45873?

CVE-2026-45873 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-45873?

Yes, CVE-2026-45873 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 5.10.166 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45873 actively exploited?

CVE-2026-45873 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45873

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: check for partial overlaps in anonymous sets Userspace provides an optimized representation in case intervals are adjacent, where the end element is omitted. The existing partial overlap detection logic skips anonymous set checks on start elements for this reason. However, it is possible to add intervals that overlap to this anonymous where two start elements with the same, eg. A-B, A-C where C < B. start end A B start end A C Restore the check on overlapping start elements to report an overlap.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-05-27

Patch available

Yes

Affected versions

Linux kernel versions 5.10.166, 5.15.91, 6.1.9, 4.19.316, 5.4.262, 6.2 and later are affected. Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 5.10.166 ≥ 5.15.91 ≥ 6.1.9 ≥ 4.19.316 ≥ 5.4.262 ≥ 6.2

Fixed in

✓ 5.10.252 5.10.x ✓ 5.15.202 5.15.x ✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-45873 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/029e5f6a95e905b12d6bc20421be32a01e0eb311
Patch
Kernel patch commit
https://git.kernel.org/stable/c/05feaf826390fd16f1deb89dd9412def3b2a280f
Patch
Kernel patch commit
https://git.kernel.org/stable/c/4780ec142cbb24b794129d3080eee5cac2943ffc
Patch

8 patch commits total View all on NVD

Frequently asked questions

What is CVE-2026-45873?

CVE-2026-45873 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.166 onward and has been patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-45873 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-45873?

Yes — CVE-2026-45873 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 5.10.166 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45873 actively exploited?

No — CVE-2026-45873 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.