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smb: client: fix potential OOB read in smb3_enum_snapshots()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential OOB read in smb3_enum_snapshots() If snapshot_array_size is smaller than GMT_TOKEN_SIZE, smb3_enum_snapshots() sets ret_data_len to sizeof(struct smb_snapshot_array) without verifying the actual length of the server's reply. Because SMB2_ioctl() places no lower bound on the server-supplied OutputCount and allocates retbuf to exactly that length, a short reply results in ret_data_len exceeding the size of retbuf. The subsequent copy_to_user() then reads past the end of retbuf, leaking adjacent slab memory to userspace. The subsequent clamp check is ineffective as it only reduces ret_data_len. Fix this by rejecting replies shorter than sizeof(struct smb_snapshot_array) with -EIO. Note that the bound is set to the 12-byte struct size rather than the 16-byte MIN_SNAPSHOT_ARRAY_SIZE defined in MS-SMB2 3.3.5.15.1, because 12 bytes is exactly what copy_to_user() attempts to read.

Announced Source revision 1
Original source ↗

CVE-2026-98169

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-2026-98169

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": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "15a221c734b9d044ab769e7e3606b2cab96fb65a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "74995ee8305a7c4d76ee70d6acd996a75eda3c03",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "210f0f1f67817e7d2348b86b5115a9b85ef5c98b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "1cdf0d304d820fb13bf0faf532c3459600f9ea43",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "dbe452a905dfe2804647530a9ff3d7e3826ed04d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e02789a53d71334b067ad72eee5d4e88a0158083",
        "lessThan": "4775c3b7a597907e0b97556c7986fda238a377ae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a94703ff8e3647f8a9a3a92a468450299a7b77e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "82a856f527334ffd69aae26e7dd9e03b19c4a520",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "25b981bfe192fd208ba04c81f4aa30ffb5141660",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.9.125",
        "lessThan": "4.10",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.14.68",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.18.6",
        "lessThan": "4.19",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/smb/client/smb2ops.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/client/smb2ops.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98169

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38254 · Revision 1
Added to Heist Feed
Publisher date
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