Medium 4.4Published Jul 30, 2024

CVE-2024-42131mm: avoid overflows in dirty throttling logic

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 4.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	2da02997e08d3efe8174c7a47696e6f7cbe69ba9 builds before 2b2d2b8766db028bd827af34075f221ae9e9efff; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before 4d3817b64eda07491bdd86a234629fe0764fb42a; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before 7a49389771ae7666f4dc3426e2a4594bf23ae290; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before a25e8536184516b55ef89ab91dd2eea429de28d2; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before c83ed422c24f0d4b264f89291d4fabe285f80dbc; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before bd16a7ee339aef3ee4c90cb23902afb6af379ea0; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before 8e0b5e7f2895eccef5c2a0018b589266f90c4805; from 2da02997e08d3efe8174c7a47696e6f7cbe69ba9 before 385d838df280eba6c8680f9777bfa0d0bfe7e8b2	CNA record
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name)	before V3.1	CISA ADP
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name)	all versions not affected	CISA ADP
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name)	before V3.1	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
linux linux_kernel linux:linux_kernel	before 4.19.320; from 4.20 before 5.4.282; from 5.5 before 5.10.222; from 5.11 before 5.15.163; from 5.16 before 6.1.98; from 6.2 before 6.6.39; from 6.7 before 6.9.9; 6.10; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/2b2d2b8766db028bd827af34075f221ae9e9efff	patch
https://git.kernel.org/stable/c/4d3817b64eda07491bdd86a234629fe0764fb42a	patch
https://git.kernel.org/stable/c/7a49389771ae7666f4dc3426e2a4594bf23ae290	patch
https://git.kernel.org/stable/c/a25e8536184516b55ef89ab91dd2eea429de28d2	patch
https://git.kernel.org/stable/c/c83ed422c24f0d4b264f89291d4fabe285f80dbc	patch
https://git.kernel.org/stable/c/bd16a7ee339aef3ee4c90cb23902afb6af379ea0	patch
https://git.kernel.org/stable/c/8e0b5e7f2895eccef5c2a0018b589266f90c4805	patch
https://git.kernel.org/stable/c/385d838df280eba6c8680f9777bfa0d0bfe7e8b2	patch
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.