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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ad8e8fec40290a8c8cf145c0deaadf76f80c5163affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ab1ff5890c7354afc7be56502fcfbd61f3b7ae4faffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 25b6821884713a31e2b49fb67b0ebd765b33e0a9affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < c56f78614e7781aaceca9bd3cb2128bf7d45c3bdaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < b9e6431cbea8bb1fae8069ed099b4ee100499835affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 17c1b9807b8a67d676b6dcf749ee932ebaa7f568affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4576100b8cd03118267513cafacde164b498b322affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.168 to ≤ 6.1.*unaffected6.6.134 to ≤ 6.6.*unaffected6.12.81 to ≤ 6.12.*unaffected6.18.22 to ≤ 6.18.*unaffected6.19.12 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ad8e8fec40290a8c8cf145c0deaadf76f80c5163 ↗
- https://git.kernel.org/stable/c/ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f ↗
- https://git.kernel.org/stable/c/25b6821884713a31e2b49fb67b0ebd765b33e0a9 ↗
- https://git.kernel.org/stable/c/c56f78614e7781aaceca9bd3cb2128bf7d45c3bd ↗
- https://git.kernel.org/stable/c/b9e6431cbea8bb1fae8069ed099b4ee100499835 ↗
- https://git.kernel.org/stable/c/17c1b9807b8a67d676b6dcf749ee932ebaa7f568 ↗
- https://git.kernel.org/stable/c/d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5 ↗
- https://git.kernel.org/stable/c/4576100b8cd03118267513cafacde164b498b322 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗