Vulnerability-Lookup

GHSA-H437-RR98-FX56

Vulnerability from github – Published: 2026-02-18 18:30 – Updated: 2026-03-18 15:30

Details

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

xfs: fix UAF in xchk_btree_check_block_owner

We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23223"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-18T16:22:32Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix UAF in xchk_btree_check_block_owner\n\nWe cannot dereference bs-\u003ecur when trying to determine if bs-\u003ecur\naliases bs-\u003esc-\u003esa.{bno,rmap}_cur after the latter has been freed.\nFix this by sampling before type before any freeing could happen.\nThe correct temporal ordering was broken when we removed xfs_btnum_t.",
  "id": "GHSA-h437-rr98-fx56",
  "modified": "2026-03-18T15:30:41Z",
  "published": "2026-02-18T18:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23223"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed82e7949f5cac3058f4100f3cd670531d41a266"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-23223 (GCVE-0-2026-23223)

Vulnerability from cvelistv5 – Published: 2026-02-18 14:53 – Updated: 2026-05-11 22:02

Title

xfs: fix UAF in xchk_btree_check_block_owner

Summary

In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchk_btree_check_block_owner We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/1d411278dda293a50…
https://git.kernel.org/stable/c/ed82e7949f5cac305…
https://git.kernel.org/stable/c/ba5264610423d9653…
https://git.kernel.org/stable/c/1c253e11225bc5167…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ec793e690f801d97a7ae2a0d429fea1fee4d44aa , < 1d411278dda293a507cb794db7d9ed3511c685c6 (git) Affected: ec793e690f801d97a7ae2a0d429fea1fee4d44aa , < ed82e7949f5cac3058f4100f3cd670531d41a266 (git) Affected: ec793e690f801d97a7ae2a0d429fea1fee4d44aa , < ba5264610423d9653aa36920520902d83841bcfd (git) Affected: ec793e690f801d97a7ae2a0d429fea1fee4d44aa , < 1c253e11225bc5167217897885b85093e17c2217 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.72 , ≤ 6.12.* (semver) Unaffected: 6.18.11 , ≤ 6.18.* (semver) Unaffected: 6.19.1 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/btree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1d411278dda293a507cb794db7d9ed3511c685c6",
              "status": "affected",
              "version": "ec793e690f801d97a7ae2a0d429fea1fee4d44aa",
              "versionType": "git"
            },
            {
              "lessThan": "ed82e7949f5cac3058f4100f3cd670531d41a266",
              "status": "affected",
              "version": "ec793e690f801d97a7ae2a0d429fea1fee4d44aa",
              "versionType": "git"
            },
            {
              "lessThan": "ba5264610423d9653aa36920520902d83841bcfd",
              "status": "affected",
              "version": "ec793e690f801d97a7ae2a0d429fea1fee4d44aa",
              "versionType": "git"
            },
            {
              "lessThan": "1c253e11225bc5167217897885b85093e17c2217",
              "status": "affected",
              "version": "ec793e690f801d97a7ae2a0d429fea1fee4d44aa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/btree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.72",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.1",
              "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": "6.12.72",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.11",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: fix UAF in xchk_btree_check_block_owner\n\nWe cannot dereference bs-\u003ecur when trying to determine if bs-\u003ecur\naliases bs-\u003esc-\u003esa.{bno,rmap}_cur after the latter has been freed.\nFix this by sampling before type before any freeing could happen.\nThe correct temporal ordering was broken when we removed xfs_btnum_t."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:02:42.267Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217"
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      ],
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23223",
    "datePublished": "2026-02-18T14:53:26.603Z",
    "dateReserved": "2026-01-13T15:37:45.987Z",
    "dateUpdated": "2026-05-11T22:02:42.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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