CVE-2023-53624
Description
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
How to fix
- linux linux_kernel5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2 or later
- git.kernel.org/stable/c/2322462d6f9ad4874f4e3c63df3b5cc00cb1acbd
- git.kernel.org/stable/c/4b8a05e3801661a0438fcd0cdef181030d966a5a
- git.kernel.org/stable/c/4fbefeab88c6e79753a25099d455d3d59d2946b4
- git.kernel.org/stable/c/7041101ff6c3073fd8f2e99920f535b111c929cb
- git.kernel.org/stable/c/85f24cb2f10b2b0f2882e5786a09b4790bb3a0ad
- git.kernel.org/stable/c/d0b43125ec892aeb1b03e5df5aab595097da225a
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.12 ≤ v < 5.10.180, 5.11 ≤ v < 5.15.111, 5.16 ≤ v < 6.1.28, 6.2 ≤ v < 6.2.15, 6.3 ≤ v < 6.3.2 | 5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.