CVE-2026-31423 net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
Description
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.
Produits et versions touchés
| Produit | Versions touchées | Corrigé en |
|---|---|---|
| Linux 7.0 | premières → < 7.0 | 7.0 |
| Linux 6.19 | premières → < 6.19.12 | 6.19.12 |
| Linux 6.18 | premières → < 6.18.22 | 6.18.22 |
| Linux 6.12 | premières → < 6.12.81 | 6.12.81 |
| Linux 6.6 | premières → < 6.6.134 | 6.6.134 |
| Linux 6.1 | premières → < 6.1.168 | 6.1.168 |
| Linux 5.15 | premières → < 5.15.203 | 5.15.203 |
| Linux 5.10 | premières → < 5.10.253 | 5.10.253 |
| Linux | 2.6.12 | Pas de correctif indiqué |
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| Produit | Versions touchées | Corrigé en |
|---|---|---|
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → dernières | Pas de correctif indiqué |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.7 → dernières | Pas de correctif indiqué |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → dernières | Pas de correctif indiqué |