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Vulnerability record · CVE-2026-23272 · published 20 March 2026

CVE-2026-23272: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.2%
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
4 Jul 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/25fcaef7948912652905e96922f36583a84fffed
https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c Patch
https://git.kernel.org/stable/c/86bc4b1a0f672d47ac19f9022432cb6a2e01cb33
https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21 Patch
https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a Patch
https://git.kernel.org/stable/c/e3ccb11fc8249759d23326038c8db987ddaabc77

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Source: NIST National Vulnerability Database (record CVE-2026-23272), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.