7.8

CVE-2026-23272

netfilter: nf_tables: unconditionally bump set->nelems before insertion

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 35d0ac9070ef619e3bf44324375878a1c540387b
Version < 6826131c7674329335ca25df2550163eb8a1fd0c
Status affected
Version 35d0ac9070ef619e3bf44324375878a1c540387b
Version < ccb8c8f3c1127cf34d18c737309897c68046bf21
Status affected
Version 35d0ac9070ef619e3bf44324375878a1c540387b
Version < def602e498a4f951da95c95b1b8ce8ae68aa733a
Status affected
Version fefdd79403e89b0c673965343b92e2e01e2713a8
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 4.10
Status affected
Version 0
Version < 4.10
Status unaffected
Version <= 6.18.*
Version 6.18.17
Status unaffected
Version <= 6.19.*
Version 6.19.7
Status unaffected
Version <= *
Version 7.0
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.032
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.