Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 14204acc09f652169baed1141c671429047b1313 before 470d347b14b0ecffa9b39cf8f644fa2351db3efb; affected eab03c23c2a162085b13200d7942fc5a00b5ccc8 before 06f27e6d7bf0abf54488259ef36bbf0e1fccb35c; affected eab03c23c2a162085b13200d7942fc5a00b5ccc8 before 1560d1f6eb6b398bddd80c16676776c0325fe5fe; affected 6.6.4 before 6.6.30 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.6.30 through 6.6.*; unaffected 6.8.9 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb
- https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c
- https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.