CVE-2026-98686 (GCVE-0-2026-98686)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:45 – Updated: 2026-10-30 12:38
VLAI
Title
smb: client: discard post-EOF pagecache when extending a file via zero range
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < 1ecf89d8efca618e0c758c06b9a1fdde8bd941da (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < 03408d15c5405f8dc3e1a114cdce2174027a85f6 (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < 3df27277f8f95345d4a6c57367824bf1aefdbf66 (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < 94949b6b2f2bf0dba2e8786aed0b08cc6bc3a183 (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < b75dadb50a25eed525264bf6fea44fad94e7626f (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < 6a8279c98ad289b27c0bdb11adb3f0c0b7fd456d (git)
Affected: 72c419d9b073628d3b5b0b2fc787b724f1a8c726 , < da4fe97fb6c730d9c94a115c7bfa6f98e0d578d0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: discard post-EOF pagecache when extending a file via zero range\n\nsmb3_zero_range() removed the pagecache only for the range being zeroed,\nso when it extends the file the folio straddling the old EOF - which may\nhold data dirtied past EOF through an mmap - was never dropped and became\nvisible as file content once the file was extended.\n\nLower the discard boundary to the smaller of the zero-range offset and the\nold EOF."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:44.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: discard post-EOF pagecache when extending a file via zero range",
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        "id": "CVE-2026-98686",
        "lastModified": "2026-10-30T13:21:18.100",
        "metrics": {},
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      "cve": "CVE-2026-98686",
      "id": "CVE-2026-98686",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: smb: client: discard post-EOF pagecache when extending a file via zero range",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98686.json",
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}



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