Skip to content
Heist/ feed
High

smb: client: fix overflow in passthrough ioctl bounds check

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.

Announced Group revision 1
Original source ↗

CVE-2026-72310

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-2026-72310

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": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "175357ee0c596cb82054650dfa32fda51ad35aaa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "dbd126539c098dba3159ce7d34b10b2daddcbd0f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "63feb687e89a3a52a31e6e01764117cc500f1974",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "160045fc943f6c46b227644261252c8a22b8a87a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "b30771b69eafae750afb7385fbcc3d77ed3f3670",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "1627e7d5c9b09721a141d07cedb178882f1ded67",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1116bbe898aefdf584838448c6869f69851e0f",
        "lessThan": "a4f27ad055392fa164f5649e89a3637b033c5fcc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2005c32ec99ee2490e8131b3953f3f212009ffea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.69",
        "lessThan": "5.5",
        "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": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/client/smb2ops.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72310

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33016 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-72310 · Revision 1Source updated