Vulnerability-Lookup

GHSA-QHVV-4MW5-PXH3

Vulnerability from github – Published: 2026-03-20 09:32 – Updated: 2026-03-20 09:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23272"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-20T09:16:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unconditionally bump set-\u003enelems before insertion\n\nIn case that the set is full, a new element gets published then removed\nwithout waiting for the RCU grace period, while RCU reader can be\nwalking over it already.\n\nTo address this issue, add the element transaction even if set is full,\nbut toggle the set_full flag to report -ENFILE so the abort path safely\nunwinds the set to its previous state.\n\nAs for element updates, decrement set-\u003enelems to restore it.\n\nA simpler fix is to call synchronize_rcu() in the error path.\nHowever, with a large batch adding elements to already maxed-out set,\nthis could cause noticeable slowdown of such batches.",
  "id": "GHSA-qhvv-4mw5-pxh3",
  "modified": "2026-03-20T09:32:10Z",
  "published": "2026-03-20T09:32:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-03-20 08:08 – Updated: 2026-03-20 08:08

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 ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6826131c767432933…
	https://git.kernel.org/stable/c/ccb8c8f3c1127cf34…
	https://git.kernel.org/stable/c/def602e498a4f951d…

Impacted products

Vendor

Product

Version

Linux

Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < 6826131c7674329335ca25df2550163eb8a1fd0c (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < ccb8c8f3c1127cf34d18c737309897c68046bf21 (git)
Affected: 35d0ac9070ef619e3bf44324375878a1c540387b , < def602e498a4f951da95c95b1b8ce8ae68aa733a (git)
Affected: fefdd79403e89b0c673965343b92e2e01e2713a8 (git)

Linux

Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6826131c7674329335ca25df2550163eb8a1fd0c",
              "status": "affected",
              "version": "35d0ac9070ef619e3bf44324375878a1c540387b",
              "versionType": "git"
            },
            {
              "lessThan": "ccb8c8f3c1127cf34d18c737309897c68046bf21",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "def602e498a4f951da95c95b1b8ce8ae68aa733a",
              "status": "affected",
              "version": "35d0ac9070ef619e3bf44324375878a1c540387b",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "versionType": "git"
            }
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        },
        {
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          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
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            },
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              "version": "6.19.7",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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    "datePublished": "2026-03-20T08:08:52.946Z",
    "dateReserved": "2026-01-13T15:37:45.991Z",
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-QHVV-4MW5-PXH3

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

Tags

Sightings

Nomenclature