Vulnerability-Lookup

GHSA-RRPQ-4XMF-C84J

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30

Details

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

xfs: handle NULL b_addr in xfs_buf_free

When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the folio_put path which calls virt_to_folio(NULL), dereferencing an invalid address and causing a kernel crash.

Call Trace: xfs_buf_free+0x25f/0x510 xfs_buf_alloc+0xc98/0x19b0 xfs_buf_find_insert+0x55/0x14d0 xfs_buf_get_map+0x122b/0x17c0 xfbtree_init_leaf_block+0x11c/0x4a0 xfbtree_init+0x1bb/0x460 xrep_rmap_setup_scan+0x100/0x1f0 xrep_rmapbt+0x41/0xc0

Fix this by skipping folio_put() when bp->b_addr is NULL.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74728"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: handle NULL b_addr in xfs_buf_free\n\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp-\u003eb_addr still NULL.  The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\n\n Call Trace:\n  xfs_buf_free+0x25f/0x510\n  xfs_buf_alloc+0xc98/0x19b0\n  xfs_buf_find_insert+0x55/0x14d0\n  xfs_buf_get_map+0x122b/0x17c0\n  xfbtree_init_leaf_block+0x11c/0x4a0\n  xfbtree_init+0x1bb/0x460\n  xrep_rmap_setup_scan+0x100/0x1f0\n  xrep_rmapbt+0x41/0xc0\n\nFix this by skipping folio_put() when bp-\u003eb_addr is NULL.",
  "id": "GHSA-rrpq-4xmf-c84j",
  "modified": "2026-08-22T18:30:30Z",
  "published": "2026-08-22T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74728"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74728 (GCVE-0-2026-74728)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33

Title

xfs: handle NULL b_addr in xfs_buf_free

Summary

In the Linux kernel, the following vulnerability has been resolved: xfs: handle NULL b_addr in xfs_buf_free When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the folio_put path which calls virt_to_folio(NULL), dereferencing an invalid address and causing a kernel crash. Call Trace: xfs_buf_free+0x25f/0x510 xfs_buf_alloc+0xc98/0x19b0 xfs_buf_find_insert+0x55/0x14d0 xfs_buf_get_map+0x122b/0x17c0 xfbtree_init_leaf_block+0x11c/0x4a0 xfbtree_init+0x1bb/0x460 xrep_rmap_setup_scan+0x100/0x1f0 xrep_rmapbt+0x41/0xc0 Fix this by skipping folio_put() when bp->b_addr is NULL.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ccf6738adcafa5ddb…
https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b…
https://git.kernel.org/stable/c/d852729c5f4f830fb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5076a6040ca1613e616d84aecfaac5f932db84e0 , < ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 (git) Affected: 5076a6040ca1613e616d84aecfaac5f932db84e0 , < 3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 (git) Affected: 5076a6040ca1613e616d84aecfaac5f932db84e0 , < d852729c5f4f830fbe7413df032e29459b3daf83 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_buf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ccf6738adcafa5ddbddc4e71b45d8a51b86643c7",
              "status": "affected",
              "version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
              "versionType": "git"
            },
            {
              "lessThan": "3aa0c1d23ee1b9d9b340fb2f4736536e1408d706",
              "status": "affected",
              "version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
              "versionType": "git"
            },
            {
              "lessThan": "d852729c5f4f830fbe7413df032e29459b3daf83",
              "status": "affected",
              "version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/xfs_buf.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": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: handle NULL b_addr in xfs_buf_free\n\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp-\u003eb_addr still NULL.  The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\n\n Call Trace:\n  xfs_buf_free+0x25f/0x510\n  xfs_buf_alloc+0xc98/0x19b0\n  xfs_buf_find_insert+0x55/0x14d0\n  xfs_buf_get_map+0x122b/0x17c0\n  xfbtree_init_leaf_block+0x11c/0x4a0\n  xfbtree_init+0x1bb/0x460\n  xrep_rmap_setup_scan+0x100/0x1f0\n  xrep_rmapbt+0x41/0xc0\n\nFix this by skipping folio_put() when bp-\u003eb_addr is NULL."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:18.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"
        },
        {
          "url": "https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"
        }
      ],
      "title": "xfs: handle NULL b_addr in xfs_buf_free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74728",
    "datePublished": "2026-08-22T15:33:18.412Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-22T15:33:18.412Z",
    "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.

Action not permitted

GHSA-RRPQ-4XMF-C84J

CVE-2026-74728 (GCVE-0-2026-74728)

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Nomenclature