CVE-2022-50286: linux kernel — Fix

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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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.4.229
linux	linux_kernel	5.5 — 5.10.163
linux	linux_kernel	5.11 — 5.15.87
linux	linux_kernel	5.16 — 6.0.18
linux	linux_kernel	6.1 — 6.1.4

References

Advisories & Patches

https://git.kernel.org/stable/c/131294c35ed6f777bd4e79d42af13b5c41bf2775 https://git.kernel.org/stable/c/6f4200ec76a0d31200c308ec5a71c68df5417004 https://git.kernel.org/stable/c/81b915181c630ee1cffa052e52874fe4e1ba91ac https://git.kernel.org/stable/c/9404839e0c9db5a517ea83c0ca3388b39d105fdf https://git.kernel.org/stable/c/c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193 https://git.kernel.org/stable/c/d440d6427a5e3a877c1c259b8d2b216ddb65e185

Other References

https://git.kernel.org/stable/c/f83391339d8493b9ff24167516aaa5a5e88d8f81

Frequently Asked Questions

What is CVE-2022-50286? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50286? +

CVE-2022-50286 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-50286? +

CVE-2022-50286 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50286? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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