Vulnerability-Lookup

GHSA-FQ97-HV4F-CRM6

Vulnerability from github – Published: 2024-02-26 18:30 – Updated: 2024-04-17 18:31

Details

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

x86/fpu: Stop relying on userspace for info to fault in xsave buffer

Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where:

fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures.
user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible.

In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever.

Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size).

[ dhansen: tweak subject / changelog ]

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-2024-26603"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-26T16:28:00Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fpu: Stop relying on userspace for info to fault in xsave buffer\n\nBefore this change, the expected size of the user space buffer was\ntaken from fx_sw-\u003exstate_size. fx_sw-\u003exstate_size can be changed\nfrom user-space, so it is possible construct a sigreturn frame where:\n\n * fx_sw-\u003exstate_size is smaller than the size required by valid bits in\n   fx_sw-\u003exfeatures.\n * user-space unmaps parts of the sigrame fpu buffer so that not all of\n   the buffer required by xrstor is accessible.\n\nIn this case, xrstor tries to restore and accesses the unmapped area\nwhich results in a fault. But fault_in_readable succeeds because buf +\nfx_sw-\u003exstate_size is within the still mapped area, so it goes back and\ntries xrstor again. It will spin in this loop forever.\n\nInstead, fault in the maximum size which can be touched by XRSTOR (taken\nfrom fpstate-\u003euser_size).\n\n[ dhansen: tweak subject / changelog ]",
  "id": "GHSA-fq97-hv4f-crm6",
  "modified": "2024-04-17T18:31:31Z",
  "published": "2024-02-26T18:30:31Z",
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}

CVE-2024-26603 (GCVE-0-2024-26603)

Vulnerability from cvelistv5 – Published: 2024-02-24 14:56 – Updated: 2026-05-11 20:00

Title

x86/fpu: Stop relying on userspace for info to fault in xsave buffer

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8bd3eee7720c14b59…
https://git.kernel.org/stable/c/627339cccdc916679…
https://git.kernel.org/stable/c/b2479ab426cef7ab7…
https://git.kernel.org/stable/c/627e28cbb65564e55…
https://git.kernel.org/stable/c/d877550eaf2dc9090…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 8bd3eee7720c14b59a206bd05b98d7586bccf99a (git) Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 627339cccdc9166792ecf96bc3c9f711a60ce996 (git) Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < b2479ab426cef7ab79a13005650eff956223ced2 (git) Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 627e28cbb65564e55008315d9e02fbb90478beda (git) Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < d877550eaf2dc9090d782864c96939397a3c6835 (git)
Linux	Linux	Affected: 5.14 Unaffected: 0 , < 5.14 (semver) Unaffected: 5.15.150 , ≤ 5.15.* (semver) Unaffected: 6.1.79 , ≤ 6.1.* (semver) Unaffected: 6.6.18 , ≤ 6.6.* (semver) Unaffected: 6.7.6 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

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.

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GHSA-FQ97-HV4F-CRM6

CVE-2024-26603 (GCVE-0-2024-26603)

Tags

Sightings

Nomenclature