# CVE-2026-45873: netfilter: nft_set_rbtree: check for partial overlaps in anonymous sets

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 4aacf3d78424293e318c616016865380b37b9cc5; < 7ca5813e1b21ef300e04593f47b073ef3217aac6 (affected, git); ≥ 2bf1435fa19d2c58054391b3bba40d5510a5758c; < 029e5f6a95e905b12d6bc20421be32a01e0eb311 (affected, git); ≥ 318cb24a4c3fce8140afaf84e4d45fcb76fb280b; < f1381ce0a1dd013610985e1c4260908163a427df (affected, git); ≥ c9e6978e2725a7d4b6cd23b2facd3f11422c0643; < f1535d56fc3f6c625b7e0559c006bd0318791bb1 (affected, git); ≥ c9e6978e2725a7d4b6cd23b2facd3f11422c0643; < 05feaf826390fd16f1deb89dd9412def3b2a280f (affected, git); ≥ c9e6978e2725a7d4b6cd23b2facd3f11422c0643; < dad14d22dff1a191612acb98facceb303d0524a2 (affected, git); ≥ c9e6978e2725a7d4b6cd23b2facd3f11422c0643; < e6497e06a102870803a59570d75ed2c36d7e11b3 (affected, git); ≥ c9e6978e2725a7d4b6cd23b2facd3f11422c0643; < 4780ec142cbb24b794129d3080eee5cac2943ffc (affected, git); 7ab87a326f20c52ff4d9972052d085be951c704b (affected, git); 181859bdfb9734aca449512fccaee4cacce64aed (affected, git); ≥ 5.10.166; < 5.10.252 (affected, semver); ≥ 5.15.91; < 5.15.202 (affected, semver); ≥ 6.1.9; < 6.1.165 (affected, semver); ≥ 4.19.316; < 4.20 (affected, semver); ≥ 5.4.262; < 5.5 (affected, semver). Source: CNA: Linux
- Linux / Linux: 6.2 (affected); ≥ 0; < 6.2 (unaffected, semver); ≥ 5.10.252; ≤ 5.10.* (unaffected, semver); ≥ 5.15.202; ≤ 5.15.* (unaffected, semver); ≥ 6.1.165; ≤ 6.1.* (unaffected, semver); ≥ 6.6.128; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.27%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/7ca5813e1b21ef300e04593f47b073ef3217aac6 (CNA: Linux)

- https://git.kernel.org/stable/c/029e5f6a95e905b12d6bc20421be32a01e0eb311 (CNA: Linux)

- https://git.kernel.org/stable/c/f1381ce0a1dd013610985e1c4260908163a427df (CNA: Linux)

- https://git.kernel.org/stable/c/f1535d56fc3f6c625b7e0559c006bd0318791bb1 (CNA: Linux)

- https://git.kernel.org/stable/c/05feaf826390fd16f1deb89dd9412def3b2a280f (CNA: Linux)

- https://git.kernel.org/stable/c/dad14d22dff1a191612acb98facceb303d0524a2 (CNA: Linux)

- https://git.kernel.org/stable/c/e6497e06a102870803a59570d75ed2c36d7e11b3 (CNA: Linux)

- https://git.kernel.org/stable/c/4780ec142cbb24b794129d3080eee5cac2943ffc (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45873; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45873; retrieved 2026-11-06; source updated Not reported

Revision: 519656a9da2e09c5a5fe19dfa22d0847f483e2f0b28bfadd82cd6ac1e3e3832a

Canonical: https://y2.dev/cve/CVE-2026-45873

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