CVE-2023-52942 (GCVE-0-2023-52942)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:37 – Updated: 2025-05-04 07:46
VLAI?
Title
cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()
Summary
In the Linux kernel, the following vulnerability has been resolved: cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask() It was found that the check to see if a partition could use up all the cpus from the parent cpuset in update_parent_subparts_cpumask() was incorrect. As a result, it is possible to leave parent with no effective cpu left even if there are tasks in the parent cpuset. This can lead to system panic as reported in [1]. Fix this probem by updating the check to fail the enabling the partition if parent's effective_cpus is a subset of the child's cpus_allowed. Also record the error code when an error happens in update_prstate() and add a test case where parent partition and child have the same cpu list and parent has task. Enabling partition in the child will fail in this case. [1] https://www.spinics.net/lists/cgroups/msg36254.html
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f0af1bfc27b52a4d42510051154c61bd176a8f06 , < a2ab7f2cf5ef8f0c6212a246e681d1fe358cec1f (git)
Affected: f0af1bfc27b52a4d42510051154c61bd176a8f06 , < e5ae8803847b80fe9d744a3174abe2b7bfed222a (git)
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    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.11 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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          "programFiles": [
            "kernel/cgroup/cpuset.c",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()\n\nIt was found that the check to see if a partition could use up all\nthe cpus from the parent cpuset in update_parent_subparts_cpumask()\nwas incorrect. As a result, it is possible to leave parent with no\neffective cpu left even if there are tasks in the parent cpuset. This\ncan lead to system panic as reported in [1].\n\nFix this probem by updating the check to fail the enabling the partition\nif parent\u0027s effective_cpus is a subset of the child\u0027s cpus_allowed.\n\nAlso record the error code when an error happens in update_prstate()\nand add a test case where parent partition and child have the same cpu\nlist and parent has task. Enabling partition in the child will fail in\nthis case.\n\n[1] https://www.spinics.net/lists/cgroups/msg36254.html"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:46:34.623Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a2ab7f2cf5ef8f0c6212a246e681d1fe358cec1f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5ae8803847b80fe9d744a3174abe2b7bfed222a"
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      ],
      "title": "cgroup/cpuset: Fix wrong check in update_parent_subparts_cpumask()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52942",
    "datePublished": "2025-03-27T16:37:20.155Z",
    "dateReserved": "2024-08-21T06:07:11.022Z",
    "dateUpdated": "2025-05-04T07:46:34.623Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1"
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