CVE-2024-26720
Linux Kernel Divide-By-Zero Vulnerability in Writeback Module
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)
INFO
Published Date :
April 3, 2024, 3:15 p.m.
Last Modified :
July 18, 2024, 12:15 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-26720
.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2024-26720
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-26720
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 18, 2024
Action Type Old Value New Value Added Reference kernel.org https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59 [No types assigned] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 11, 2024
Action Type Old Value New Value Added Reference kernel.org https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/000099d71648504fb9c7a4616f92c2b70c3e44ec [No types assigned] Removed Reference kernel.org https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Removed Reference kernel.org https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 27, 2024
Action Type Old Value New Value Added Reference kernel.org https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html [No types assigned] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 25, 2024
Action Type Old Value New Value Added Reference kernel.org https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html [No types assigned] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 29, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 03, 2024
Action Type Old Value New Value Added 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) Added Reference kernel.org https://git.kernel.org/stable/c/c593d26fb5d577ef31b6e49a31e08ae3ebc1bc1e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1f12e4b3284d6c863f272eb2de0d4248ed211cf4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/81e7d2530d458548b90a5c5e76b77ad5e5d1c0df [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/5099871b370335809c0fd1abad74d9c7c205d43f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/16b1025eaa8fc223ab4273ece20d1c3a4211a95d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ec18ec230301583395576915d274b407743d8f6c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/65977bed167a92e87085e757fffa5798f7314c9f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9319b647902cbd5cc884ac08a8a6d54ce111fc78 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-26720
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-26720
weaknesses.