CVE-2022-50286

published 2025-09-15

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…

Priority P4 22 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

19 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < 6f4200ec76a0d31200c308ec5a71c68df5417004	6f4200ec76a0d31200c308ec5a71c68df5417004
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < 9404839e0c9db5a517ea83c0ca3388b39d105fdf	9404839e0c9db5a517ea83c0ca3388b39d105fdf
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < d440d6427a5e3a877c1c259b8d2b216ddb65e185	d440d6427a5e3a877c1c259b8d2b216ddb65e185
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193	c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < 81b915181c630ee1cffa052e52874fe4e1ba91ac	81b915181c630ee1cffa052e52874fe4e1ba91ac
linux	linux	>= 0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6 < 131294c35ed6f777bd4e79d42af13b5c41bf2775	131294c35ed6f777bd4e79d42af13b5c41bf2775
linux	linux	>= 4.19.270 < 4.19.271	4.19.271
linux	linux	>= d40e09f701cf7a44e595a558b067b2b4f67fbf87 < f83391339d8493b9ff24167516aaa5a5e88d8f81	f83391339d8493b9ff24167516aaa5a5e88d8f81
linux	linux_kernel	< 5.4.229	5.4.229
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 5.11 < 5.15.87	5.15.87
linux	linux_kernel	>= 5.16 < 6.0.18	6.0.18
linux	linux_kernel	>= 5.5 < 5.10.163	5.10.163
linux	linux_kernel	>= 6.1 < 6.1.4	6.1.4

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-237