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CVE Record

CVE-2024-35985: sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-35985 is a Linux kernel scheduler bug that can cause a fatal kernel crash. The public record describes it as rare, but fatal when triggered. There is no cited evidence of active exploitation and no CVSS score in the provided sources.

Executive priority

Treat as a reliability and availability risk, not a confirmed breach indicator. Patch during the next appropriate kernel maintenance window, faster for critical systems where crashes create business disruption.

Technical view

In the Linux EEVDF scheduler, reweight_eevdf() did not constrain vlag like update_entity_lag(). A signed 64-bit multiplication overflow could corrupt vruntime calculations, causing entity_eligible() to falsely find no eligible entity. pick_eevdf() could then return NULL, leading to a kernel NULL dereference.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions or downstream kernels containing this scheduler code. The CVE record lists affected versions including 6.7, 6.6.30, 6.8.9, and 6.9. Confirm exact exposure through your distribution’s kernel advisories.

Exploitation context

The sources describe a rare scheduler calculation failure causing a fatal NULL dereference. They do not describe remote exploitation, privilege requirements, proof-of-concept activity, or active exploitation. CISA KEV status is false in the provided bundle.

Researcher notes

The public details point to an integer overflow in scheduler lag scaling and a NULL dereference outcome. Evidence is incomplete for exploitability assessment: no CVSS, CWE, attack vector, reproducer, or active exploitation details are provided.

Mitigation direction

  • Apply vendor or distribution kernel updates that include the referenced stable fixes.
  • Prioritize systems where kernel crashes would cause material downtime.
  • If updates are unavailable, follow vendor guidance for supported workarounds or backports.
  • Track distribution advisories for corrected package versions.

Validation and detection

  • Inventory Linux kernel versions across servers, endpoints, appliances, and cloud images.
  • Compare installed kernels against vendor advisories for CVE-2024-35985.
  • Confirm whether deployed kernels include the referenced stable commits.
  • Review crash telemetry for scheduler-related NULL dereferences after rollout.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2024-35985 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux14204acc09f652169baed1141c671429047b1313, eab03c23c2a162085b13200d7942fc5a00b5ccc8, eab03c23c2a162085b13200d7942fc5a00b5ccc8unaffected
LinuxLinux6.7, 0, 6.6.30, 6.8.9, 6.9affected
Weakness

CWE details

No CWE listed

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