github - ghsa-cjw7-m4qf-xc59

GHSA-CJW7-M4QF-XC59

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-04-29 21:31

Details

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

x86/fpu: Prevent state corruption in __fpu__restore_sig()

The non-compacted slowpath uses __copy_from_user() and copies the entire user buffer into the kernel buffer, verbatim. This means that the kernel buffer may now contain entirely invalid state on which XRSTOR will #GP. validate_user_xstate_header() can detect some of that corruption, but that leaves the onus on callers to clear the buffer.

Prior to XSAVES support, it was possible just to reinitialize the buffer, completely, but with supervisor states that is not longer possible as the buffer clearing code split got it backwards. Fixing that is possible but not corrupting the state in the first place is more robust.

Avoid corruption of the kernel XSAVE buffer by using copy_user_to_xstate() which validates the XSAVE header contents before copying the actual states to the kernel. copy_user_to_xstate() was previously only called for compacted-format kernel buffers, but it works for both compacted and non-compacted forms.

Using it for the non-compacted form is slower because of multiple __copy_from_user() operations, but that cost is less important than robust code in an already slow path.

[ Changelog polished by Dave Hansen ]

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-2021-47227"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-754"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:11Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fpu: Prevent state corruption in __fpu__restore_sig()\n\nThe non-compacted slowpath uses __copy_from_user() and copies the entire\nuser buffer into the kernel buffer, verbatim.  This means that the kernel\nbuffer may now contain entirely invalid state on which XRSTOR will #GP.\nvalidate_user_xstate_header() can detect some of that corruption, but that\nleaves the onus on callers to clear the buffer.\n\nPrior to XSAVES support, it was possible just to reinitialize the buffer,\ncompletely, but with supervisor states that is not longer possible as the\nbuffer clearing code split got it backwards. Fixing that is possible but\nnot corrupting the state in the first place is more robust.\n\nAvoid corruption of the kernel XSAVE buffer by using copy_user_to_xstate()\nwhich validates the XSAVE header contents before copying the actual states\nto the kernel. copy_user_to_xstate() was previously only called for\ncompacted-format kernel buffers, but it works for both compacted and\nnon-compacted forms.\n\nUsing it for the non-compacted form is slower because of multiple\n__copy_from_user() operations, but that cost is less important than robust\ncode in an already slow path.\n\n[ Changelog polished by Dave Hansen ]",
  "id": "GHSA-cjw7-m4qf-xc59",
  "modified": "2025-04-29T21:31:33Z",
  "published": "2024-05-21T15:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47227"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/076f732b16a5bf842686e1b43ab6021a2d98233e"
    },
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    },
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  "severity": [
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CVE-2021-47227 (GCVE-0-2021-47227)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2025-05-04 07:06

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Prevent state corruption in __fpu__restore_sig() The non-compacted slowpath uses __copy_from_user() and copies the entire user buffer into the kernel buffer, verbatim. This means that the kernel buffer may now contain entirely invalid state on which XRSTOR will #GP. validate_user_xstate_header() can detect some of that corruption, but that leaves the onus on callers to clear the buffer. Prior to XSAVES support, it was possible just to reinitialize the buffer, completely, but with supervisor states that is not longer possible as the buffer clearing code split got it backwards. Fixing that is possible but not corrupting the state in the first place is more robust. Avoid corruption of the kernel XSAVE buffer by using copy_user_to_xstate() which validates the XSAVE header contents before copying the actual states to the kernel. copy_user_to_xstate() was previously only called for compacted-format kernel buffers, but it works for both compacted and non-compacted forms. Using it for the non-compacted form is slower because of multiple __copy_from_user() operations, but that cost is less important than robust code in an already slow path. [ Changelog polished by Dave Hansen ]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/076f732b16a5bf842…
	https://git.kernel.org/stable/c/ec25ea1f3f05d6f8e…
	https://git.kernel.org/stable/c/484cea4f362e1eeb5…

Impacted products

Vendor

Product

Version

Linux

Affected: b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94 , < 076f732b16a5bf842686e1b43ab6021a2d98233e (git)
Affected: b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94 , < ec25ea1f3f05d6f8ee51d1277efea986eafd4f2a (git)
Affected: b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94 , < 484cea4f362e1eeb5c869abbfb5f90eae6421b38 (git)

Linux

Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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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-CJW7-M4QF-XC59

CVE-2021-47227 (GCVE-0-2021-47227)

Tags

Sightings

Nomenclature