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ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling 1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths. 2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.

Announced Source revision 1
Original source ↗

CVE-2026-93811

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-2026-93811

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": "cb69d4d6f709f87c94afa28ae64c501576692171",
        "lessThan": "f46a70a082bdbfecbe074af8a719c26c4deb58c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7",
        "lessThan": "86c2625fb9863139b359805fc6be1e31edbd3d65",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7",
        "lessThan": "edc17db83085624a2b1bacf6a4521d7f15571737",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7",
        "lessThan": "c3836f55e0dab96314774215e12d87f63fa919f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7",
        "lessThan": "6e6329322ad733c5b23555c609353841560b26bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8f0541186e9ad1b62accc9519cc2b7a7240272a7",
        "lessThan": "d708a36634bb7b6f94d0e76d587d2ec50b2b93b5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6e8f4abf584253cbaa596ea4ad13110cf61cd4c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8e33102309bd6839b2e2e158f93a7b378cb4655d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.62",
        "lessThan": "5.15.222",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.18.18",
        "lessThan": "5.19",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.19.2",
        "lessThan": "5.20",
        "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": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "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": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/server/vfs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93811

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#8285 · Revision 1
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Publisher date
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