CVE-2026-23333: netfilter: nft_set_rbtree: validate open interval overlap

mediumCVSS 5.5CVE-2026-23333

CSIRTS triage

vendor: Linux product: Linux Kernel Memory corruption

What: The netfilter nft_set_rbtree implementation fails to properly validate overlapping open intervals.
Who is affected: Systems running affected Linux kernel versions with netfilter nft_set_rbtree rules configured.
Urgency: Medium severity with no exploitation reported; address in regular patching cycle.
Action: Apply Linux kernel patch adding open interval overlap validation to nft_set_rbtree.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23333

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-23333	coverage & exploitation status	NVD · CVE.org

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