github - ghsa-p5hp-9793-2w9c

GHSA-P5HP-9793-2W9C

Vulnerability from github – Published: 2024-07-16 12:30 – Updated: 2024-08-07 21:31

Details

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

KVM: x86: nSVM: fix potential NULL derefernce on nested migration

Turns out that due to review feedback and/or rebases I accidentally moved the call to nested_svm_load_cr3 to be too early, before the NPT is enabled, which is very wrong to do.

KVM can't even access guest memory at that point as nested NPT is needed for that, and of course it won't initialize the walk_mmu, which is main issue the patch was addressing.

Fix this for real.

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-2022-48793"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-16T12:15:04Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: nSVM: fix potential NULL derefernce on nested migration\n\nTurns out that due to review feedback and/or rebases\nI accidentally moved the call to nested_svm_load_cr3 to be too early,\nbefore the NPT is enabled, which is very wrong to do.\n\nKVM can\u0027t even access guest memory at that point as nested NPT\nis needed for that, and of course it won\u0027t initialize the walk_mmu,\nwhich is main issue the patch was addressing.\n\nFix this for real.",
  "id": "GHSA-p5hp-9793-2w9c",
  "modified": "2024-08-07T21:31:43Z",
  "published": "2024-07-16T12:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48793"
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      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-48793 (GCVE-0-2022-48793)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:43 – Updated: 2025-05-04 08:23

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: nSVM: fix potential NULL derefernce on nested migration Turns out that due to review feedback and/or rebases I accidentally moved the call to nested_svm_load_cr3 to be too early, before the NPT is enabled, which is very wrong to do. KVM can't even access guest memory at that point as nested NPT is needed for that, and of course it won't initialize the walk_mmu, which is main issue the patch was addressing. Fix this for real.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/74b426bea4f7e3b08…
	https://git.kernel.org/stable/c/352193edda48e08e8…
	https://git.kernel.org/stable/c/e1779c2714c3023e4…

Impacted products

Vendor

Product

Version

Linux

Affected: 232f75d3b4b5456de6f0b671aa86345d62de1473 , < 74b426bea4f7e3b081add2b88d4fba16d3af7ab6 (git)
Affected: 232f75d3b4b5456de6f0b671aa86345d62de1473 , < 352193edda48e08e8824a7ece09aec830a603cfe (git)
Affected: 232f75d3b4b5456de6f0b671aa86345d62de1473 , < e1779c2714c3023e4629825762bcbc43a3b943df (git)

Linux

Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.25 , ≤ 5.15.* (semver)
Unaffected: 5.16.11 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

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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-P5HP-9793-2W9C

CVE-2022-48793 (GCVE-0-2022-48793)

Tags

Sightings

Nomenclature