CVE-2023-53624None▾ SunlitIn 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"…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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
Linux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < 4b8a05e3801661a0438fcd0cdef181030d966a5aLinux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < d0b43125ec892aeb1b03e5df5aab595097da225aLinux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < 4fbefeab88c6e79753a25099d455d3d59d2946b4Linux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < 85f24cb2f10b2b0f2882e5786a09b4790bb3a0adLinux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < 2322462d6f9ad4874f4e3c63df3b5cc00cb1acbdLinux >= afe4fd062416b158a8a8538b23adc1930a9b88dc < 7041101ff6c3073fd8f2e99920f535b111c929cbLinux 3.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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