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ksmbd: pin conn during async oplock break notification

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ksmbd: pin conn during async oplock break notification smb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn pointer in an async ksmbd_work and then queue that work on ksmbd-io. The work only increments conn->r_count, which prevents teardown from passing the pending-request wait after the increment, but it does not pin the struct ksmbd_conn object. If connection teardown races with an oplock break notification, the last conn reference can be dropped before the queued worker finishes. The worker then uses the freed conn in ksmbd_conn_write() and ksmbd_conn_r_count_dec(). Take a real conn reference when publishing the conn pointer to the async work item, and drop it after the notification work has decremented r_count. Apply the same lifetime rule to lease break notification, which uses the same work->conn pattern.

Announced Group revision 1
Original source ↗

CVE-2026-68381

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-2026-68381

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": "09aeab68033161cb54f194da93e51a11aee6144b",
        "lessThan": "0f72fc9659d7f585460d43c158055df5afdcffb6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a4261bbc33fbf99b99c80aa3a2c5097611802980",
        "lessThan": "793e1c7041b93af96ff87e678329bc16aee7ba88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3aa660c059240e0c795217182cf7df32909dd917",
        "lessThan": "6ecb252efa0b413ac3d9979fb4eec247f8fc1258",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3aa660c059240e0c795217182cf7df32909dd917",
        "lessThan": "14062c74e5b25c27edcff7a2fe0dc701c930b372",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3aa660c059240e0c795217182cf7df32909dd917",
        "lessThan": "aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.84",
        "lessThan": "6.6.148",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.20",
        "lessThan": "6.12.101",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.13.8",
        "lessThan": "6.14",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/smb/server/oplock.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/server/oplock.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68381

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41709 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-68381 · Revision 1Source updated