CVE-2024-42102
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".
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.26% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-369
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ecPatch
- https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942cPatch
- https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807Patch
- https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1aPatch
- https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59Patch
- https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63Patch
- https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00Patch
- https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9dPatch
- https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ecPatch
- https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942cPatch
- https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807Patch
- https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1aPatch
- https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59Patch
- https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63Patch
- https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00Patch
- https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9dPatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.