CVE-2026-23272 (GCVE-0-2026-23272)

Vulnerability from cvelistv5 – Published: 2026-03-20 08:08 – Updated: 2026-08-05 12:21
VLAI
Title
netfilter: nf_tables: unconditionally bump set->nelems before insertion
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < 25fcaef7948912652905e96922f36583a84fffed (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < e3ccb11fc8249759d23326038c8db987ddaabc77 (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < 86bc4b1a0f672d47ac19f9022432cb6a2e01cb33 (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < 6826131c7674329335ca25df2550163eb8a1fd0c (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < ccb8c8f3c1127cf34d18c737309897c68046bf21 (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < def602e498a4f951da95c95b1b8ce8ae68aa733a (git)
Affected: fefdd79403e89b0c673965343b92e2e01e2713a8 (git)
Affected: 4.9.33 , < 4.10 (semver)
Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T17:12:24+00:00",
      "cve": "CVE-2026-23272",
      "id": "CVE-2026-23272",
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      "product_status:known_affected": "232",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_tables: unconditionally bump set-\u003enelems before insertion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23272.json",
      "version": "3"
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      "cve": "CVE-2026-23272",
      "id": "CVE-2026-23272",
      "initial_release_date": "2026-03-22T00:24:36Z",
      "product_status:first_fixed": "2",
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      "product_status:recommended": "556",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23272",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23272.json",
      "version": "37"
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  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.