CVE-2026-64156 (GCVE-0-2026-64156)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-07-19 15:40
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6dd80936618c4ff852d4db73aca400351d9bd9f0
Version: 6dd80936618c4ff852d4db73aca400351d9bd9f0
Version: 6dd80936618c4ff852d4db73aca400351d9bd9f0
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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": [
            {
              "lessThan": "77bb293049d61e04c12b24ebbffafaf5ab36af90",
              "status": "affected",
              "version": "6dd80936618c4ff852d4db73aca400351d9bd9f0",
              "versionType": "git"
            },
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              "lessThan": "f91e10435c0dd37c48b1b25e6236284f656ddc0c",
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              "versionType": "git"
            },
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          ]
        },
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          "programFiles": [
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            "fs/netfs/write_issue.c"
          ],
          "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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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
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                  "vulnerable": true
                },
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                  "versionEndExcluding": "7.1",
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:44.277Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90"
        },
        {
          "url": "https://git.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5"
        }
      ],
      "title": "netfs, afs: Fix write skipping in dir/link writepages",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64156",
    "datePublished": "2026-07-19T15:40:44.277Z",
    "dateReserved": "2026-07-19T07:54:57.038Z",
    "dateUpdated": "2026-07-19T15:40:44.277Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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