CVE-2022-50286
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-12-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline When converting files with inline data to extents, delayed allocations made on a file system created with both the bigalloc and inline options can result in invalid extent status cache content, incorrect reserved cluster counts, kernel memory leaks, and potential kernel panics. With bigalloc, the code that determines whether a block must be delayed allocated searches the extent tree to see if that block maps to a previously allocated cluster. If not, the block is delayed allocated, and otherwise, it isn't. However, if the inline option is also used, and if the file containing the block is marked as able to store data inline, there isn't a valid extent tree associated with the file. The current code in ext4_clu_mapped() calls ext4_find_extent() to search the non-existent tree for a previously allocated cluster anyway, which typically finds nothing, as desired. However, a side effect of the search can be to cache invalid content from the non-existent tree (garbage) in the extent status tree, including bogus entries in the pending reservation tree. To fix this, avoid searching the extent tree when allocating blocks for bigalloc + inline files that are being converted from inline to extent mapped.
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Meta Information
Published
2025-09-15
Last Modified
2025-12-03
Generated
2026-05-27
AI Q&A
2025-09-15
EPSS Evaluated
2026-05-25
NVD
CVE-2022-50286
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
linux linux_kernel to 5.4.229 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.163 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.87 (exc)
linux linux_kernel From 5.16 (inc) to 6.0.18 (exc)
linux linux_kernel From 6.1 (inc) to 6.1.4 (exc)
Helpful Resources
Exploitability
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CWE ID Description
CWE-NVD-CWE-noinfo
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability occurs in the Linux kernel's ext4 filesystem when both the bigalloc and inline options are used. When files with inline data are converted to extents, delayed allocations can cause invalid extent status cache content, incorrect reserved cluster counts, kernel memory leaks, and potential kernel panics. The issue arises because the code incorrectly searches for an extent tree that doesn't exist for inline files, leading to caching of invalid data.


How can this vulnerability impact me? :

The vulnerability can lead to kernel memory leaks and potential kernel panics, which may cause system instability or crashes. It can also result in incorrect filesystem metadata, such as invalid extent status cache content and incorrect reserved cluster counts, potentially affecting data integrity.


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