CVE-2026-46057 (GCVE-0-2026-46057)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-06-14 17:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork() hook_cred_transfer() only copies the Landlock security blob when the source credential has a domain. This is inconsistent with landlock_restrict_self() which can set LOG_SUBDOMAINS_OFF on a credential without creating a domain (via the ruleset_fd=-1 path): the field is committed but not preserved across fork() because the child's prepare_creds() calls hook_cred_transfer() which skips the copy when domain is NULL. This breaks the documented use case where a process mutes subdomain logs before forking sandboxed children: the children lose the muting and their domains produce unexpected audit records. Fix this by unconditionally copying the Landlock credential blob.
References
Impacted products
Vendor Product Version
Linux Linux Version: ead9079f75696a028aea8860787770c80eddb8f9
Version: ead9079f75696a028aea8860787770c80eddb8f9
Version: ead9079f75696a028aea8860787770c80eddb8f9
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          "programFiles": [
            "security/landlock/cred.c",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlandlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork()\n\nhook_cred_transfer() only copies the Landlock security blob when the\nsource credential has a domain.  This is inconsistent with\nlandlock_restrict_self() which can set LOG_SUBDOMAINS_OFF on a\ncredential without creating a domain (via the ruleset_fd=-1 path): the\nfield is committed but not preserved across fork() because the child\u0027s\nprepare_creds() calls hook_cred_transfer() which skips the copy when\ndomain is NULL.\n\nThis breaks the documented use case where a process mutes subdomain logs\nbefore forking sandboxed children: the children lose the muting and\ntheir domains produce unexpected audit records.\n\nFix this by unconditionally copying the Landlock credential blob."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:51:11.492Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724"
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    "cveId": "CVE-2026-46057",
    "datePublished": "2026-05-27T12:57:16.076Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-06-14T17:51:11.492Z",
    "state": "PUBLISHED"
  },
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