ghsa-7x54-v488-56pj
Vulnerability from github
Published
2024-07-29 15:30
Modified
2025-11-04 00:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

mm: prevent derefencing NULL ptr in pfn_section_valid()

Commit 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing memory_section->usage") changed pfn_section_valid() to add a READ_ONCE() call around "ms->usage" to fix a race with section_deactivate() where ms->usage can be cleared. The READ_ONCE() call, by itself, is not enough to prevent NULL pointer dereference. We need to check its value before dereferencing it.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-41055"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-29T15:15:13Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: prevent derefencing NULL ptr in pfn_section_valid()\n\nCommit 5ec8e8ea8b77 (\"mm/sparsemem: fix race in accessing\nmemory_section-\u003eusage\") changed pfn_section_valid() to add a READ_ONCE()\ncall around \"ms-\u003eusage\" to fix a race with section_deactivate() where\nms-\u003eusage can be cleared.  The READ_ONCE() call, by itself, is not enough\nto prevent NULL pointer dereference.  We need to check its value before\ndereferencing it.",
  "id": "GHSA-7x54-v488-56pj",
  "modified": "2025-11-04T00:31:00Z",
  "published": "2024-07-29T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41055"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0100aeb8a12d51950418e685f879cc80cb8e5982"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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"
    }
  ]
}


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