github - ghsa-f43m-69ch-cggg

GHSA-F43M-69CH-CGGG

Vulnerability from github – Published: 2024-10-21 21:30 – Updated: 2024-10-25 15:31

Details

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

riscv: Sync efi page table's kernel mappings before switching

The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic.

Fix that by updating the efi kernel mappings before switching to the efi page table.

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-2022-49004"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T20:15:11Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Sync efi page table\u0027s kernel mappings before switching\n\nThe EFI page table is initially created as a copy of the kernel page table.\nWith VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area:\nif the stack is allocated in a new PGD (one that was not present at the\nmoment of the efi page table creation or not synced in a previous vmalloc\nfault), the kernel will take a trap when switching to the efi page table\nwhen the vmalloc kernel stack is accessed, resulting in a kernel panic.\n\nFix that by updating the efi kernel mappings before switching to the efi\npage table.",
  "id": "GHSA-f43m-69ch-cggg",
  "modified": "2024-10-25T15:31:26Z",
  "published": "2024-10-21T21:30:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49004"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f105a742725a1b78766a55169f1d827732e62b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f479383d92944406d4b3f2bc03c2f640def9f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa7a7d185ef380546b4b1fed6f84f31dbae8cec7"
    }
  ],
  "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-2022-49004 (GCVE-0-2022-49004)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2025-05-04 08:27

Summary

In the Linux kernel, the following vulnerability has been resolved: riscv: Sync efi page table's kernel mappings before switching The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic. Fix that by updating the efi kernel mappings before switching to the efi page table.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/fa7a7d185ef380546…
	https://git.kernel.org/stable/c/96f479383d9294440…
	https://git.kernel.org/stable/c/3f105a742725a1b78…

Impacted products

Vendor

Product

Version

Linux

Affected: b91540d52a08b65eb6a2b09132e1bd54fa82754c , < fa7a7d185ef380546b4b1fed6f84f31dbae8cec7 (git)
Affected: b91540d52a08b65eb6a2b09132e1bd54fa82754c , < 96f479383d92944406d4b3f2bc03c2f640def9f1 (git)
Affected: b91540d52a08b65eb6a2b09132e1bd54fa82754c , < 3f105a742725a1b78766a55169f1d827732e62b8 (git)

Linux

Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.15.82 , ≤ 5.15.* (semver)
Unaffected: 6.0.12 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)

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                "timestamp": "2024-10-22T13:14:45.523737Z",
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Sightings

Author	Source	Type	Date

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-F43M-69CH-CGGG

CVE-2022-49004 (GCVE-0-2022-49004)

Tags

Sightings

Nomenclature