CVE - CVE-2024-26720

CVE-ID
CVE-2024-26720	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again (struct dirty_throttle_control )->thresh is an unsigned long, but is passed as the u32 divisor argument to div_u64(). On architectures where unsigned long is 64 bytes, the argument will be implicitly truncated. Use div64_u64() instead of div_u64() so that the value used in the "is this a safe division" check is the same as the divisor. Also, remove redundant cast of the numerator to u64, as that should happen implicitly. This would be difficult to exploit in memcg domain, given the ratio-based arithmetic domain_drity_limits() uses, but is much easier in global writeback domain with a BDI_CAP_STRICTLIMIT-backing device, using e.g. vm.dirty_bytes=(1<<32)PAGE_SIZE so that dtc->thresh == (1<<32)
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/16b1025eaa8fc223ab4273ece20d1c3a4211a95d URL:https://git.kernel.org/stable/c/16b1025eaa8fc223ab4273ece20d1c3a4211a95d MISC:https://git.kernel.org/stable/c/1f12e4b3284d6c863f272eb2de0d4248ed211cf4 URL:https://git.kernel.org/stable/c/1f12e4b3284d6c863f272eb2de0d4248ed211cf4 MISC:https://git.kernel.org/stable/c/5099871b370335809c0fd1abad74d9c7c205d43f URL:https://git.kernel.org/stable/c/5099871b370335809c0fd1abad74d9c7c205d43f MISC:https://git.kernel.org/stable/c/65977bed167a92e87085e757fffa5798f7314c9f URL:https://git.kernel.org/stable/c/65977bed167a92e87085e757fffa5798f7314c9f MISC:https://git.kernel.org/stable/c/81e7d2530d458548b90a5c5e76b77ad5e5d1c0df URL:https://git.kernel.org/stable/c/81e7d2530d458548b90a5c5e76b77ad5e5d1c0df MISC:https://git.kernel.org/stable/c/9319b647902cbd5cc884ac08a8a6d54ce111fc78 URL:https://git.kernel.org/stable/c/9319b647902cbd5cc884ac08a8a6d54ce111fc78 MISC:https://git.kernel.org/stable/c/c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e URL:https://git.kernel.org/stable/c/c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e MISC:https://git.kernel.org/stable/c/ec18ec230301583395576915d274b407743d8f6c URL:https://git.kernel.org/stable/c/ec18ec230301583395576915d274b407743d8f6c
Assigning CNA
kernel.org
Date Record Created
20240219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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