CVE-2024-35985 (GCVE-0-2024-35985)
Vulnerability from cvelistv5 – Published: 2024-05-20 09:47 – Updated: 2026-05-23 15:45
VLAI
EPSS
VEX
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
References
Impacted products
2 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 | |
| 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 |
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"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T03:30:11.561Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-35985\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:40:16.595087Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:12.555Z\"}}], \"cna\": {\"title\": \"sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"14204acc09f652169baed1141c671429047b1313\", \"lessThan\": \"470d347b14b0ecffa9b39cf8f644fa2351db3efb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eab03c23c2a162085b13200d7942fc5a00b5ccc8\", \"lessThan\": \"06f27e6d7bf0abf54488259ef36bbf0e1fccb35c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"eab03c23c2a162085b13200d7942fc5a00b5ccc8\", \"lessThan\": \"1560d1f6eb6b398bddd80c16676776c0325fe5fe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6.6.4\", \"lessThan\": \"6.6.30\", \"versionType\": \"semver\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.30\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb\"}, {\"url\": \"https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c\"}, {\"url\": \"https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.30\", \"versionStartIncluding\": \"6.6.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.9\", \"versionStartIncluding\": \"6.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:45:47.239Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-35985\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:45:47.239Z\", \"dateReserved\": \"2024-05-17T13:50:33.145Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-20T09:47:52.389Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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