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fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.

Announced Source revision 1
Original source ↗

CVE-2026-43112

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-2026-43112

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": "c63433a09d6ae4c226fcbc66da4c58fc189fd746",
        "lessThan": "a2ba20c17de8eb028f96b1d85f119d3d25655bd9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "fbced33599653471b4581dfe1abc7b467031f126",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "5d4fe469fe7dbff7d874c196bb680a82f2625d95",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "86f9c23e0814cfdffda9eedf0c591c51ba209010",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a31080899d5fdafcccf7f39dd214a814a2c82626",
        "lessThan": "78ec5bf2f589ec7fd8f169394bfeca541b077317",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.11",
        "lessThan": "5.15.209",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/smb/client/fs_context.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/client/fs_context.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43112

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40026 · Revision 1
Added to Heist Feed
Publisher date
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