CVE-2026-31423Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: net/sched: sch_hfsc: fix divide-by-zero in rtsc_min() m2sm() converts a u32 slope to a u64 scaled value. For large inputs (e.g. m1=4000000000), the result can reach 2…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.1%
0.1% → 0.2%
Last analysed / modified upstream
— → 5.5
none → medium
In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
m2sm() converts a u32 slope to a u64 scaled value. For large inputs
(e.g. m1=4000000000), the result can reach 2^32. rtsc_min() stores
the difference of two such u64 values in a u32 variable dsm and
uses it as a divisor. When the difference is exactly 2^32 the
truncation yields zero, causing a divide-by-zero oops in the
concave-curve intersection path:
Oops: divide error: 0000 RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601) Call Trace: init_ed (net/sched/sch_hfsc.c:629) hfsc_enqueue (net/sched/sch_hfsc.c:1569) [...]
Widen dsm to u64 and replace do_div() with div64_u64() so the full
difference is preserved.
linux_kernel >= 2.6.12.1, < 5.10.253linux_kernel >= 5.11, < 5.15.203linux_kernel >= 5.16, < 6.1.168linux_kernel >= 6.2, < 6.6.134linux_kernel >= 6.7, < 6.12.81linux_kernel >= 6.13, < 6.18.22linux_kernel >= 6.19, < 6.19.12linux_kernel = 2.6.12linux_kernel = 7.0Upgrade past the affected range:
linux_kernel 6.19.12Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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