Tracker / CVE-2023-53624
CVE-2023-53624
Medium 5.5
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_fq: fix integer overflow of "credit" if sch_fq is configured with "initial quantum" having values greater than INT_MAX, the first assignment of "credit" does signed integer overflow to a very negative value. In this situation, the syzkaller script provided by Cristoph triggers the CPU soft-lockup warning even with few sockets. It's not an infinite loop, but "credit" wasn't probably meant to be minus 2Gb for each new flow. Capping "initial quantum" to INT_MAX proved to fix the issue. v2: validation of "initial quantum" is done in fq_policy, instead of open coding in fq_change() _ suggested by Jakub Kicinski
Affected products and versions
| linux | linux_kernel · 3.12 → 5.10.180 |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.111 |
| linux | linux_kernel · 5.16 → 6.1.28 |
| linux | linux_kernel · 6.2 → 6.2.15 |
| linux | linux_kernel · 6.3 → 6.3.2 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.