Vulnerability-Lookup

GHSA-HCXQ-WXQG-V33Q

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-19 18:31

Details

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

netfs, afs: Fix write skipping in dir/link writepages

Fix netfs_write_single() and afs_single_writepages() to better handle a write that would be skipped due to lock contention and WB_SYNC_NONE by returning 1 from netfs_write_single() if it skipped and making afs_single_writepages() skip also. If a skip occurs, the inode must be re-marked as the VFS may have cleared the mark.

This is really only theoretical for directories in netfs_write_single() as the only path to that is through afs_single_writepages() that takes the ->validate_lock around it, thereby serialising it.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64156"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:57Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs, afs: Fix write skipping in dir/link writepages\n\nFix netfs_write_single() and afs_single_writepages() to better handle a\nwrite that would be skipped due to lock contention and WB_SYNC_NONE by\nreturning 1 from netfs_write_single() if it skipped and making\nafs_single_writepages() skip also.  If a skip occurs, the inode must be\nre-marked as the VFS may have cleared the mark.\n\nThis is really only theoretical for directories in netfs_write_single() as\nthe only path to that is through afs_single_writepages() that takes the\n-\u003evalidate_lock around it, thereby serialising it.",
  "id": "GHSA-hcxq-wxqg-v33q",
  "modified": "2026-07-19T18:31:54Z",
  "published": "2026-07-19T18:31:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64156 (GCVE-0-2026-64156)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40

Title

netfs, afs: Fix write skipping in dir/link writepages

Summary

In the Linux kernel, the following vulnerability has been resolved: netfs, afs: Fix write skipping in dir/link writepages Fix netfs_write_single() and afs_single_writepages() to better handle a write that would be skipped due to lock contention and WB_SYNC_NONE by returning 1 from netfs_write_single() if it skipped and making afs_single_writepages() skip also. If a skip occurs, the inode must be re-marked as the VFS may have cleared the mark. This is really only theoretical for directories in netfs_write_single() as the only path to that is through afs_single_writepages() that takes the ->validate_lock around it, thereby serialising it.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/77bb293049d61e04c…
https://git.kernel.org/stable/c/f91e10435c0dd37c4…
https://git.kernel.org/stable/c/9871938f99cc6cb26…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6dd80936618c4ff852d4db73aca400351d9bd9f0 , < 77bb293049d61e04c12b24ebbffafaf5ab36af90 (git) Affected: 6dd80936618c4ff852d4db73aca400351d9bd9f0 , < f91e10435c0dd37c48b1b25e6236284f656ddc0c (git) Affected: 6dd80936618c4ff852d4db73aca400351d9bd9f0 , < 9871938f99cc6cb266a77265491660e2375271f5 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/dir.c",
            "fs/netfs/write_issue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6dd80936618c4ff852d4db73aca400351d9bd9f0",
              "versionType": "git"
            },
            {
              "lessThan": "f91e10435c0dd37c48b1b25e6236284f656ddc0c",
              "status": "affected",
              "version": "6dd80936618c4ff852d4db73aca400351d9bd9f0",
              "versionType": "git"
            },
            {
              "lessThan": "9871938f99cc6cb266a77265491660e2375271f5",
              "status": "affected",
              "version": "6dd80936618c4ff852d4db73aca400351d9bd9f0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
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              "version": "7.0.11",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs, afs: Fix write skipping in dir/link writepages\n\nFix netfs_write_single() and afs_single_writepages() to better handle a\nwrite that would be skipped due to lock contention and WB_SYNC_NONE by\nreturning 1 from netfs_write_single() if it skipped and making\nafs_single_writepages() skip also.  If a skip occurs, the inode must be\nre-marked as the VFS may have cleared the mark.\n\nThis is really only theoretical for directories in netfs_write_single() as\nthe only path to that is through afs_single_writepages() that takes the\n-\u003evalidate_lock around it, thereby serialising it."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:44.277Z",
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        },
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          "url": "https://git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5"
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      ],
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    "datePublished": "2026-07-19T15:40:44.277Z",
    "dateReserved": "2026-07-19T07:54:57.038Z",
    "dateUpdated": "2026-07-19T15:40:44.277Z",
    "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-HCXQ-WXQG-V33Q

CVE-2026-64156 (GCVE-0-2026-64156)

Tags

Sightings

Nomenclature