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CVE-2024-42131 In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The…

Description

In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.

Affected products and versions

Product Affected versions Fixed in
Linux 6.10 earliest → < 6.10 6.10
Linux 6.9 earliest → < 6.9.9 6.9.9
Linux 6.6 earliest → < 6.6.39 6.6.39
Linux 6.1 earliest → < 6.1.98 6.1.98
Linux 5.15 earliest → < 5.15.163 5.15.163
Linux 5.10 earliest → < 5.10.222 5.10.222
Linux 5.4 earliest → < 5.4.282 5.4.282
Linux 4.19 earliest → < 4.19.320 4.19.320
Linux 2.6.29 No fix stated
Show the 6 other branches
Product Affected versions Fixed in
RUGGEDCOM RST2428P 3.1 earliest → < 3.1 3.1
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Versions not published
SCALANCE XCM-/XRM-/XCH-/XRH-300 family 3.1 earliest → < 3.1 3.1
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5

References

Timeline

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