High 7.8Published Mar 20, 2026

CVE-2026-23272netfilter: nf_tables: unconditionally bump set->nelems before insertion

Updated under an hour ago (Oct 27, 2026, 10:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	35d0ac9070ef619e3bf44324375878a1c540387b builds before 25fcaef7948912652905e96922f36583a84fffed; from 35d0ac9070ef619e3bf44324375878a1c540387b before e3ccb11fc8249759d23326038c8db987ddaabc77; from 35d0ac9070ef619e3bf44324375878a1c540387b before 86bc4b1a0f672d47ac19f9022432cb6a2e01cb33; from 35d0ac9070ef619e3bf44324375878a1c540387b before 6826131c7674329335ca25df2550163eb8a1fd0c; from 35d0ac9070ef619e3bf44324375878a1c540387b before ccb8c8f3c1127cf34d18c737309897c68046bf21; from 35d0ac9070ef619e3bf44324375878a1c540387b before def602e498a4f951da95c95b1b8ce8ae68aa733a; fefdd79403e89b0c673965343b92e2e01e2713a8; from 4.9.33 before 4.10	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 4.9.33 before 4.10; from 4.10.1 before 6.18.17; from 6.19 before 6.19.7; 4.10; 4.10; 4.10; 4.10; 7.0; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/25fcaef7948912652905e96922f36583a84fffed
https://git.kernel.org/stable/c/e3ccb11fc8249759d23326038c8db987ddaabc77
https://git.kernel.org/stable/c/86bc4b1a0f672d47ac19f9022432cb6a2e01cb33
https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c	patch
https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21	patch
https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.