CVE-2026-45873

Description

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.

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/029e5f6a95e905b12d6bc20421be32a01e0eb311 https://git.kernel.org/stable/c/05feaf826390fd16f1deb89dd9412def3b2a280f https://git.kernel.org/stable/c/4780ec142cbb24b794129d3080eee5cac2943ffc https://git.kernel.org/stable/c/7ca5813e1b21ef300e04593f47b073ef3217aac6 https://git.kernel.org/stable/c/dad14d22dff1a191612acb98facceb303d0524a2 https://git.kernel.org/stable/c/e6497e06a102870803a59570d75ed2c36d7e11b3 https://git.kernel.org/stable/c/f1381ce0a1dd013610985e1c4260908163a427df https://git.kernel.org/stable/c/f1535d56fc3f6c625b7e0559c006bd0318791bb1

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-45873? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.