Vulnerability-Lookup

GHSA-C47W-GGCW-5493

Vulnerability from github – Published: 2026-02-04 18:30 – Updated: 2026-02-04 18:30

Details

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

fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()

Above the while() loop in wait_sb_inodes(), we document that we must wait for all pages under writeback for data integrity. Consequently, if a mapping, like fuse, traditionally does not have data integrity semantics, there is no need to wait at all; we can simply skip these inodes.

This restores fuse back to prior behavior where syncs are no-ops. This fixes a user regression where if a system is running a faulty fuse server that does not reply to issued write requests, this causes wait_sb_inodes() to wait forever.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23109"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-04T17:16:21Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()\n\nAbove the while() loop in wait_sb_inodes(), we document that we must wait\nfor all pages under writeback for data integrity.  Consequently, if a\nmapping, like fuse, traditionally does not have data integrity semantics,\nthere is no need to wait at all; we can simply skip these inodes.\n\nThis restores fuse back to prior behavior where syncs are no-ops.  This\nfixes a user regression where if a system is running a faulty fuse server\nthat does not reply to issued write requests, this causes wait_sb_inodes()\nto wait forever.",
  "id": "GHSA-c47w-ggcw-5493",
  "modified": "2026-02-04T18:30:44Z",
  "published": "2026-02-04T18:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23109"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f4ed5e2b8f111553562507ad6202432c7c57731"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9a49aa302a05e91ca01f69031cb79a0ea33031f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23109 (GCVE-0-2026-23109)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-04 16:08

Title

fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()

Summary

In the Linux kernel, the following vulnerability has been resolved: fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes() Above the while() loop in wait_sb_inodes(), we document that we must wait for all pages under writeback for data integrity. Consequently, if a mapping, like fuse, traditionally does not have data integrity semantics, there is no need to wait at all; we can simply skip these inodes. This restores fuse back to prior behavior where syncs are no-ops. This fixes a user regression where if a system is running a faulty fuse server that does not reply to issued write requests, this causes wait_sb_inodes() to wait forever.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3f4ed5e2b8f111553…
	https://git.kernel.org/stable/c/f9a49aa302a05e91c…

Impacted products

Vendor

Product

Version

Linux

Affected: 0c58a97f919c24fe4245015f4375a39ff05665b6 , < 3f4ed5e2b8f111553562507ad6202432c7c57731 (git)
Affected: 0c58a97f919c24fe4245015f4375a39ff05665b6 , < f9a49aa302a05e91ca01f69031cb79a0ea33031f (git)

Linux

Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc7 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fs-writeback.c",
            "fs/fuse/file.c",
            "include/linux/pagemap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f4ed5e2b8f111553562507ad6202432c7c57731",
              "status": "affected",
              "version": "0c58a97f919c24fe4245015f4375a39ff05665b6",
              "versionType": "git"
            },
            {
              "lessThan": "f9a49aa302a05e91ca01f69031cb79a0ea33031f",
              "status": "affected",
              "version": "0c58a97f919c24fe4245015f4375a39ff05665b6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fs-writeback.c",
            "fs/fuse/file.c",
            "include/linux/pagemap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc7",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.8",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc7",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()\n\nAbove the while() loop in wait_sb_inodes(), we document that we must wait\nfor all pages under writeback for data integrity.  Consequently, if a\nmapping, like fuse, traditionally does not have data integrity semantics,\nthere is no need to wait at all; we can simply skip these inodes.\n\nThis restores fuse back to prior behavior where syncs are no-ops.  This\nfixes a user regression where if a system is running a faulty fuse server\nthat does not reply to issued write requests, this causes wait_sb_inodes()\nto wait forever."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-04T16:08:29.468Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3f4ed5e2b8f111553562507ad6202432c7c57731"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9a49aa302a05e91ca01f69031cb79a0ea33031f"
        }
      ],
      "title": "fs/writeback: skip AS_NO_DATA_INTEGRITY mappings in wait_sb_inodes()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23109",
    "datePublished": "2026-02-04T16:08:29.468Z",
    "dateReserved": "2026-01-13T15:37:45.967Z",
    "dateUpdated": "2026-02-04T16:08:29.468Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-C47W-GGCW-5493

CVE-2026-23109 (GCVE-0-2026-23109)

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Sightings

Nomenclature