CVE-2024-42243: Linux kernel · mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 15:19 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 7 Aug 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
AI-suggested
A patch series has been released that adjusts MAX_PAGECACHE_ORDER to values supported by xarray and avoids PMD-sized page caches in certain kernel paths. Applying these patches or updating to a kernel version that includes this fix will mitigate the issue. Since this is a kernel-level fix, users should update their Linux kernel to a version containing these patches. No additional mitigation steps are indicated.
Description
CVE-2024-42243 addresses a Linux kernel vulnerability related to the page cache size handling in the memory management subsystem. The issue arises because the xarray data structure cannot support arbitrary page cache sizes, leading to a warning and potential instability on systems with large base page sizes, such as ARM64 with 64KB base pages and 512MB huge pages. The fix involves adjusting the MAX_PAGECACHE_ORDER to a value supported by xarray and avoiding PMD-sized page caches in certain paths. This vulnerability was resolved by a patch series that limits the page cache size accordingly.
References
- git.kernel.org/stable/c/0c8a837153c15c33f9b4616860331a2dba1120c1 (opens in a new tab)
- git.kernel.org/stable/c/a0c42ddd0969fdc760a85e20e267776028a7ca4e (opens in a new tab)
- git.kernel.org/stable/c/333c5539a31f48828456aa9997ec2808f06a699a (opens in a new tab)
- git.kernel.org/stable/c/099d90642a711caae377f53309abfe27e8724a8b (opens in a new tab)