PT-2026-43890 · Linux · Linux
Published
2026-05-27
·
Updated
2026-05-27
·
CVE-2026-46023
None
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In the Linux kernel, the following vulnerability has been resolved:
dm mirror: fix integer overflow in create dirty log()
The argument count calculation in create dirty log() performs
*args used = 2 + param count before validating against argc. When a
user provides a param count close to UINT MAX via the device mapper
table string, this unsigned addition wraps around to a small value,
causing the subsequent argc < *args used check to be bypassed.The overflowed param count is then passed as argc to dm dirty log create(),
where it can cause out-of-bounds reads on the argv array.
Fix by comparing param count against argc - 2 before performing the
addition, following the same pattern used by parse features() in the
same file. Since argc >= 2 is already guaranteed, the subtraction is
safe.
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Related Identifiers
Affected Products
Linux