CVE-2024-35985 (GCVE-0-2024-35985)

Vulnerability from cvelistv5 – Published: 2024-05-20 09:47 – Updated: 2026-05-23 15:45
VLAI
Title
sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:40 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6847 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 14204acc09f652169baed1141c671429047b1313 , < 470d347b14b0ecffa9b39cf8f644fa2351db3efb (git)
Affected: eab03c23c2a162085b13200d7942fc5a00b5ccc8 , < 06f27e6d7bf0abf54488259ef36bbf0e1fccb35c (git)
Affected: eab03c23c2a162085b13200d7942fc5a00b5ccc8 , < 1560d1f6eb6b398bddd80c16676776c0325fe5fe (git)
Affected: 6.6.4 , < 6.6.30 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.6.30 , ≤ 6.6.* (semver)
Unaffected: 6.8.9 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2024/cve-2024-35985.json",
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              "url": "https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe"
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        "cveId": "CVE-2024-35985",
        "datePublished": "2024-05-20T09:47:52.389Z",
        "dateReserved": "2024-05-17T13:50:33.145Z",
        "dateUpdated": "2026-05-23T15:45:47.239Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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