github - ghsa-qp9g-95jm-jwfj

ghsa-qp9g-95jm-jwfj

Vulnerability from github

Published

2024-05-20 12:30

Modified

2024-05-20 12:30

Details

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

sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()

It was possible to have pick_eevdf() return NULL, which then causes a NULL-deref. This turned out to be due to entity_eligible() returning falsely negative because of a s64 multiplcation overflow.

Specifically, reweight_eevdf() computes the vlag without considering the limit placed upon vlag as update_entity_lag() does, and then the scaling multiplication (remember that weight is 20bit fixed point) can overflow. This then leads to the new vruntime being weird which then causes the above entity_eligible() to go side-ways and claim nothing is eligible.

Thus limit the range of vlag accordingly.

All this was quite rare, but fatal when it does happen.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-35985"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-20T10:15:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()\n\nIt was possible to have pick_eevdf() return NULL, which then causes a\nNULL-deref. This turned out to be due to entity_eligible() returning\nfalsely negative because of a s64 multiplcation overflow.\n\nSpecifically, reweight_eevdf() computes the vlag without considering\nthe limit placed upon vlag as update_entity_lag() does, and then the\nscaling multiplication (remember that weight is 20bit fixed point) can\noverflow. This then leads to the new vruntime being weird which then\ncauses the above entity_eligible() to go side-ways and claim nothing\nis eligible.\n\nThus limit the range of vlag accordingly.\n\nAll this was quite rare, but fatal when it does happen.",
  "id": "GHSA-qp9g-95jm-jwfj",
  "modified": "2024-05-20T12:30:29Z",
  "published": "2024-05-20T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35985"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c"
    },
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  "schema_version": "1.4.0",
  "severity": []
}

cve-2024-35985

Vulnerability from cvelistv5

Published

2024-05-20 09:47

Modified

2024-11-05 09:26

Severity ?

Summary

sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()

References

▼	URL	Tags
	https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb
	https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c
	https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe

Impacted products

Vendor

Product

Version

▼

Linux

Version: 14204acc09f6
Version: eab03c23c2a1
Version: eab03c23c2a1

Linux

Version: 6.7

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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