CVE-2026-98683

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: flush dirty data before zeroing a range smb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the page cache over the target range with truncate_pagecache_range() and then issuing FSCTL_SET_ZERO_DATA to the server. Dirty data was only flushed conditionally, when the range reached or extended EOF. For a purely interior zero range that does not reach EOF, no flush happened, so a dirty folio overlapping the range could be written back to the server after the FSCTL and refill the range that was just zeroed with stale data. Fix this by unconditionally flushing and waiting for dirty data in the range before invalidating the page cache and issuing FSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in commit d7d2adcd022b ("smb/client: flush dirty data before punching a hole"); the two paths are structurally identical here. This is observed as generic/363 randomly reading stale data where a zeroed range is expected against Windows Server.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-18 16:17:21.660000

Last modified

2026-10-19 10:19:32.727000

View original CVE JSON

{
  "id": "CVE-2026-98683",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-18T16:17:21.660",
  "lastModified": "2026-10-19T10:19:32.727",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: flush dirty data before zeroing a range\n\nsmb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the\npage cache over the target range with truncate_pagecache_range() and\nthen issuing FSCTL_SET_ZERO_DATA to the server.\n\nDirty data was only flushed conditionally, when the range reached or\nextended EOF.  For a purely interior zero range that does not reach\nEOF, no flush happened, so a dirty folio overlapping the range could\nbe written back to the server after the FSCTL and refill the range\nthat was just zeroed with stale data.\n\nFix this by unconditionally flushing and waiting for dirty data in the\nrange before invalidating the page cache and issuing\nFSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in\ncommit d7d2adcd022b (\"smb/client: flush dirty data before punching a\nhole\"); the two paths are structurally identical here.\n\nThis is observed as generic/363 randomly reading stale data where a\nzeroed range is expected against Windows Server."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "lessThan": "cecf4114069fc19629d284710fd783d56bbca862",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "lessThan": "e8ba21c7e6ef3d4cb617858760673877b2e4a2bb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
              "lessThan": "8f8d32c1044f70e46e87550e039a15ff20a4b21c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "13af7446428771e9e529284d390e7994df8be683",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "0a9423f99ded38b32bd1864347332cc557e6b141",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7dfa4279c55f467a88e653a5d544817181b22aea",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.1.110",
              "lessThan": "6.2",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.6.51",
              "lessThan": "6.7",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.10.10",
              "lessThan": "6.11",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.11",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.56",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.10",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8f8d32c1044f70e46e87550e039a15ff20a4b21c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cecf4114069fc19629d284710fd783d56bbca862",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e8ba21c7e6ef3d4cb617858760673877b2e4a2bb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}