Vulnerability-Lookup

GHSA-J574-JVXX-M43Q

Vulnerability from github – Published: 2026-05-08 15:31 – Updated: 2026-05-26 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

nstree: tighten permission checks for listing

Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43390"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:50Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnstree: tighten permission checks for listing\n\nEven privileged services should not necessarily be able to see other\nprivileged service\u0027s namespaces so they can\u0027t leak information to each\nother. Use may_see_all_namespaces() helper that centralizes this policy\nuntil the nstree adapts.",
  "id": "GHSA-j574-jvxx-m43q",
  "modified": "2026-05-26T15:32:08Z",
  "published": "2026-05-08T15:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43390"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43390 (GCVE-0-2026-43390)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-11 22:23

Title

nstree: tighten permission checks for listing

Summary

In the Linux kernel, the following vulnerability has been resolved: nstree: tighten permission checks for listing Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/0abd81645fc95ec6a…
https://git.kernel.org/stable/c/8d76afe84fa2babf6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76b6f5dfb3fda76fce1f9990d6fa58adc711122b , < 0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 (git) Affected: 76b6f5dfb3fda76fce1f9990d6fa58adc711122b , < 8d76afe84fa2babf604b3c173730d4d2b067e361 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/nstree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0abd81645fc95ec6a9d4e4813000f22c5efc0ff4",
              "status": "affected",
              "version": "76b6f5dfb3fda76fce1f9990d6fa58adc711122b",
              "versionType": "git"
            },
            {
              "lessThan": "8d76afe84fa2babf604b3c173730d4d2b067e361",
              "status": "affected",
              "version": "76b6f5dfb3fda76fce1f9990d6fa58adc711122b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/nstree.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnstree: tighten permission checks for listing\n\nEven privileged services should not necessarily be able to see other\nprivileged service\u0027s namespaces so they can\u0027t leak information to each\nother. Use may_see_all_namespaces() helper that centralizes this policy\nuntil the nstree adapts."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:23:39.579Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361"
        }
      ],
      "title": "nstree: tighten permission checks for listing",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43390",
    "datePublished": "2026-05-08T14:21:35.337Z",
    "dateReserved": "2026-05-01T14:12:56.007Z",
    "dateUpdated": "2026-05-11T22:23:39.579Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-J574-JVXX-M43Q

CVE-2026-43390 (GCVE-0-2026-43390)

Tags

Sightings

Nomenclature