Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ad8e8fec40290a8c8cf145c0deaadf76f80c5163; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ab1ff5890c7354afc7be56502fcfbd61f3b7ae4f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 25b6821884713a31e2b49fb67b0ebd765b33e0a9; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c56f78614e7781aaceca9bd3cb2128bf7d45c3bd; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b9e6431cbea8bb1fae8069ed099b4ee100499835; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 17c1b9807b8a67d676b6dcf749ee932ebaa7f568; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d0aefec1b1a1ba2c1d251028dc2c4e5b4ce1fea5; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 4576100b8cd03118267513cafacde164b498b322 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.