ghsa-pghg-fxcf-g9f9
Vulnerability from github
Published
2025-04-16 15:34
Modified
2025-11-03 21:33
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:

x86/mm: Fix flush_tlb_range() when used for zapping normal PMDs

On the following path, flush_tlb_range() can be used for zapping normal PMD entries (PMD entries that point to page tables) together with the PTE entries in the pointed-to page table:

collapse_pte_mapped_thp
  pmdp_collapse_flush
    flush_tlb_range

The arm64 version of flush_tlb_range() has a comment describing that it can be used for page table removal, and does not use any last-level invalidation optimizations. Fix the X86 version by making it behave the same way.

Currently, X86 only uses this information for the following two purposes, which I think means the issue doesn't have much impact:

  • In native_flush_tlb_multi() for checking if lazy TLB CPUs need to be IPI'd to avoid issues with speculative page table walks.
  • In Hyper-V TLB paravirtualization, again for lazy TLB stuff.

The patch "x86/mm: only invalidate final translations with INVLPGB" which is currently under review (see https://lore.kernel.org/all/20241230175550.4046587-13-riel@surriel.com/) would probably be making the impact of this a lot worse.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-22045"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:15:57Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Fix flush_tlb_range() when used for zapping normal PMDs\n\nOn the following path, flush_tlb_range() can be used for zapping normal\nPMD entries (PMD entries that point to page tables) together with the PTE\nentries in the pointed-to page table:\n\n    collapse_pte_mapped_thp\n      pmdp_collapse_flush\n        flush_tlb_range\n\nThe arm64 version of flush_tlb_range() has a comment describing that it can\nbe used for page table removal, and does not use any last-level\ninvalidation optimizations. Fix the X86 version by making it behave the\nsame way.\n\nCurrently, X86 only uses this information for the following two purposes,\nwhich I think means the issue doesn\u0027t have much impact:\n\n - In native_flush_tlb_multi() for checking if lazy TLB CPUs need to be\n   IPI\u0027d to avoid issues with speculative page table walks.\n - In Hyper-V TLB paravirtualization, again for lazy TLB stuff.\n\nThe patch \"x86/mm: only invalidate final translations with INVLPGB\" which\nis currently under review (see\n\u003chttps://lore.kernel.org/all/20241230175550.4046587-13-riel@surriel.com/\u003e)\nwould probably be making the impact of this a lot worse.",
  "id": "GHSA-pghg-fxcf-g9f9",
  "modified": "2025-11-03T21:33:35Z",
  "published": "2025-04-16T15:34:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22045"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0708fd6bd8161871bfbadced2ca4319b84ab44fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a8f806ea6b5dd64b3d1f05ff774817d5f7ddbd1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/320ac1af4c0bdb92c864dc9250d1329234820edf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ef938c3503563bfc2ac15083557f880d29c2e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/556d446068f90981e5d71ca686bdaccdd545d491"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/618d5612ecb7bfc1c85342daafeb2b47e29e77a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7085895c59e4057ffae17f58990ccb630087d0d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78d6f9a9eb2a5da6fcbd76d6191d24b0dcc321be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93224deb50a8d20df3884f3672ce9f982129aa50"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.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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