Vulnerability-Lookup

GHSA-Q738-WCRR-X4XX

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46057"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:25Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-q738-wcrr-x4xx",
  "modified": "2026-05-27T15:33:22Z",
  "published": "2026-05-27T15:33:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46057"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46057 (GCVE-0-2026-46057)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-05-27 12:57

Title

landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork()

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.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/2fcde49092aac55d5…
https://git.kernel.org/stable/c/1c513b8a00df13d23…
https://git.kernel.org/stable/c/874c8f83826c95c62…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ead9079f75696a028aea8860787770c80eddb8f9 , < 2fcde49092aac55d5beef43fdd3633217672f7d1 (git) Affected: ead9079f75696a028aea8860787770c80eddb8f9 , < 1c513b8a00df13d231021e74ad92babb3fedf64a (git) Affected: ead9079f75696a028aea8860787770c80eddb8f9 , < 874c8f83826c95c62c21d9edfe9ef43e5c346724 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/landlock/cred.c",
            "tools/testing/selftests/landlock/audit_test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2fcde49092aac55d5beef43fdd3633217672f7d1",
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              "versionType": "git"
            },
            {
              "lessThan": "1c513b8a00df13d231021e74ad92babb3fedf64a",
              "status": "affected",
              "version": "ead9079f75696a028aea8860787770c80eddb8f9",
              "versionType": "git"
            },
            {
              "lessThan": "874c8f83826c95c62c21d9edfe9ef43e5c346724",
              "status": "affected",
              "version": "ead9079f75696a028aea8860787770c80eddb8f9",
              "versionType": "git"
            }
          ]
        },
        {
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          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
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              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-27T12:57:16.076Z",
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        },
        {
          "url": "https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724"
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      ],
      "title": "landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork()",
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    "datePublished": "2026-05-27T12:57:16.076Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-05-27T12:57:16.076Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-Q738-WCRR-X4XX

CVE-2026-46057 (GCVE-0-2026-46057)

Tags

Sightings

Nomenclature