CVSS 4.7 · Medium EPSS 0,26%
Kerentanan Divide By Zero pada linux kernel. Skor CVSS 3.1 4.7 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 4.19.307 hingga sebelum 4.19.318 |
| linux | linux kernel | Versi 5.4.269 hingga sebelum 5.4.280 |
| linux | linux kernel | Versi 5.10.210 hingga sebelum 5.10.222 |
| linux | linux kernel | Versi 5.15.149 hingga sebelum 5.15.163 |
| linux | linux kernel | Versi 6.1.79 hingga sebelum 6.1.98 |
| linux | linux kernel | Versi 6.6.18 hingga sebelum 6.6.39 |
| linux | linux kernel | Versi 6.8 hingga sebelum 6.9.9 |