CVE-2024-35985
sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()
At a glance
- Source
- NVD
- EPSS
- EPSS 0.23 % · percentile 13 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-476 — NULL Pointer Dereference
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2024-35703
- GCVE · GCVE-0-2024-35985
CERT-FR advisories
- CERTFR-2024-AVI-0645 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0633 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0611 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.6.4 < 6.6.30cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.8.9cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.9:rc5:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 14204acc09f652169baed1141c671429047b1313 < 470d347b14b0ecffa9b39cf8f644fa2351db3efb ; affected eab03c23c2a162085b13200d7942fc5a00b5ccc8 < 06f27e6d7bf0abf54488259ef36bbf0e1fccb35c ; affected eab03c23c2a162085b13200d7942fc5a00b5ccc8 < 1560d1f6eb6b398bddd80c16676776c0325fe5fe ; affected 6.6.4 < 6.6.30 |
| Linux · Linux | affected 6.7 ; unaffected 0 < 6.7 ; unaffected 6.6.30 ≤ 6.6.* ; unaffected 6.8.9 ≤ 6.8.* ; unaffected 6.9 ≤ * |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |