Vulnerability-Lookup

GHSA-4C46-9F7J-R9VQ

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_counter: serialize reset with spinlock

Add a global static spinlock to serialize counter fetch+reset operations, preventing concurrent dump-and-reset from underrunning values.

The lock is taken before fetching the total so that two parallel resets cannot both read the same counter values and then both subtract them.

A global lock is used for simplicity since resets are infrequent. If this becomes a bottleneck, it can be replaced with a per-net lock later.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45897"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:03Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_counter: serialize reset with spinlock\n\nAdd a global static spinlock to serialize counter fetch+reset\noperations, preventing concurrent dump-and-reset from underrunning\nvalues.\n\nThe lock is taken before fetching the total so that two parallel\nresets cannot both read the same counter values and then both\nsubtract them.\n\nA global lock is used for simplicity since resets are infrequent.\nIf this becomes a bottleneck, it can be replaced with a per-net\nlock later.",
  "id": "GHSA-4c46-9f7j-r9vq",
  "modified": "2026-05-27T15:33:15Z",
  "published": "2026-05-27T15:33:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45897"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f15a43526841b679445c32e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/779c60a5190c42689534172f4b49e927c9959e4e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45897 (GCVE-0-2026-45897)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17

Title

netfilter: nft_counter: serialize reset with spinlock

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_counter: serialize reset with spinlock Add a global static spinlock to serialize counter fetch+reset operations, preventing concurrent dump-and-reset from underrunning values. The lock is taken before fetching the total so that two parallel resets cannot both read the same counter values and then both subtract them. A global lock is used for simplicity since resets are infrequent. If this becomes a bottleneck, it can be replaced with a per-net lock later.

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f…
https://git.kernel.org/stable/c/779c60a5190c42689…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3cb03edb4de33fd04c4ea55f47397b96a8657c53 , < 0cdc6d5a26f2d1f7f15a43526841b679445c32e2 (git) Affected: 3cb03edb4de33fd04c4ea55f47397b96a8657c53 , < 779c60a5190c42689534172f4b49e927c9959e4e (git) Affected: fb1adb05ea87b6149e65a31e511756c4f470d0cd (git) Affected: f123293db16dcd0cd81b246ae60e6362f0025d0a (git) Affected: 6.1.107 , < 6.2 (semver) Affected: 6.6.48 , < 6.7 (semver)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_counter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0cdc6d5a26f2d1f7f15a43526841b679445c32e2",
              "status": "affected",
              "version": "3cb03edb4de33fd04c4ea55f47397b96a8657c53",
              "versionType": "git"
            },
            {
              "lessThan": "779c60a5190c42689534172f4b49e927c9959e4e",
              "status": "affected",
              "version": "3cb03edb4de33fd04c4ea55f47397b96a8657c53",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "fb1adb05ea87b6149e65a31e511756c4f470d0cd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f123293db16dcd0cd81b246ae60e6362f0025d0a",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.107",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.48",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_counter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.107",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.6.48",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_counter: serialize reset with spinlock\n\nAdd a global static spinlock to serialize counter fetch+reset\noperations, preventing concurrent dump-and-reset from underrunning\nvalues.\n\nThe lock is taken before fetching the total so that two parallel\nresets cannot both read the same counter values and then both\nsubtract them.\n\nA global lock is used for simplicity since resets are infrequent.\nIf this becomes a bottleneck, it can be replaced with a per-net\nlock later."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:07.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f15a43526841b679445c32e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/779c60a5190c42689534172f4b49e927c9959e4e"
        }
      ],
      "title": "netfilter: nft_counter: serialize reset with spinlock",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45897",
    "datePublished": "2026-05-27T12:17:07.038Z",
    "dateReserved": "2026-05-13T15:03:33.083Z",
    "dateUpdated": "2026-05-27T12:17:07.038Z",
    "state": "PUBLISHED"
  },
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}

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.

Action not permitted

GHSA-4C46-9F7J-R9VQ

CVE-2026-45897 (GCVE-0-2026-45897)

Tags

Sightings

Nomenclature