Service interruption via dirty-threshold multiplication overflow
Published Jul 30, 2024 · Updated May 23, 2026
Integer overflow in affected Linux kernel releases allows local users to interrupt service through dirty-page throttling. In mm/page-writeback.c, wb_dirty_limits() multiplies wb_thresh by bg_thresh without a u64 cast, causing wraparound on 32-bit kernels when the product reaches 2^32. Low-privileged local access and the threshold condition are required; default settings with 4 GB of RAM satisfy it, but the public record does not specify whether disruption ends in a hang, crash, or reboot.
Summary
What happened
Integer overflow in affected Linux kernel releases allows local users to interrupt service through dirty-page throttling. In mm/page-writeback.c, wb_dirty_limits() multiplies wb_thresh by bg_thresh without a u64 cast, causing wraparound on 32-bit kernels when the product reaches 2^32. Low-privileged local access and the threshold condition are required; default settings with 4 GB of RAM satisfy it, but the public record does not specify whether disruption ends in a hang, crash, or reboot.
The record
- CVE
- CVE-2024-42102
- Published
- Jul 30, 2024
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-369
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 30, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16b1025eaa8fc223ab4273ece20d1c3a4211a95d <cbbe17a324437c0ff99881a3ee453da45b228a00
- Affected versionversion=1f12e4b3284d6c863f272eb2de0d4248ed211cf4 <23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807
- Affected versionversion=4.19.307 <4.19.318
- Affected versionversion=5099871b370335809c0fd1abad74d9c7c205d43f <2820005edae13b140f2d54267d1bd6bb23915f59
- Affected versionversion=5.10.210 <5.10.222
- Affected versionversion=5.15.149 <5.15.163
- Affected versionversion=5.4.269 <5.4.280
- Affected versionversion=6.1.79 <6.1.98
- Affected versionversion=65977bed167a92e87085e757fffa5798f7314c9f
- Affected versionversion=6.6.18 <6.6.39
- Affected versionversion=6.7.6 <6.8
- Affected versionversion=6.8
- Affected versionversion=81e7d2530d458548b90a5c5e76b77ad5e5d1c0df <145faa3d03688cbb7bbaaecbd84c01539852942c
- Affected versionversion=9319b647902cbd5cc884ac08a8a6d54ce111fc78 <000099d71648504fb9c7a4616f92c2b70c3e44ec
- Affected versionversion=9319b647902cbd5cc884ac08a8a6d54ce111fc78 <30139c702048f1097342a31302cbd3d478f50c63
- Affected versionversion=c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e <253f9ea7e8e53a5176bd80ceb174907b10724c1a
- Affected versionversion=ec18ec230301583395576915d274b407743d8f6c <f6620df12cb6bdcad671d269debbb23573502f9d
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo