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ksmbd: Do not skip lock checks for single-byte ranges

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not skip lock checks for single-byte ranges check_lock_range() uses inclusive ranges. Its callers pass the end offset as start + length - 1, so start == end represents a valid single-byte range rather than an empty range. The start == end shortcut therefore skips mandatory byte-range lock checks for one-byte reads, writes, copychunk operations and one-byte truncate ranges. A conflicting lock covering that byte is not checked and the operation is allowed to proceed. Remove the shortcut. The truncate size == inode->i_size case is already handled by only calling check_lock_range() when the new size differs from the current file size.

Announced Source revision 1
Original source ↗

CVE-2026-90176

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90176

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "52fcbb92e0d3acfd1448b2a43b6595d540da5295",
        "lessThan": "a89cc145832e81c32199d4ca2e1ea8bd51ed601d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "da29cd197246c85c0473259f1cad897d9d28faea",
        "lessThan": "993e0158331d37c04da18efe551b5e1e35fb3078",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a6f4cfa3783804336491e0edcb250c25f9b59d33",
        "lessThan": "f751d6e39d4c937c45f8fedc66699aa7d2d52288",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "571204e4758a528fbd67330bd4b0dfbdafb33dd8",
        "lessThan": "84c2d8e807ac489f5c91769293fb15dfdae8bae8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d510ac31626ed157d2182149559430350cf2104",
        "lessThan": "07a9e289ff7edcc004f58952405f8a65c4e37512",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5d510ac31626ed157d2182149559430350cf2104",
        "lessThan": "d40c24634fe077a0dc91fd11fccf44ce12b454d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.1.160",
        "lessThan": "6.1.188",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.120",
        "lessThan": "6.6.157",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.64",
        "lessThan": "6.12.110",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.18.3",
        "lessThan": "6.18.52",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/smb/server/vfs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/server/vfs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90176

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36559 · Revision 1
Added to Heist Feed
Publisher date
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