Bug 2396140 (CVE-2023-53357)

Summary: CVE-2023-53357 kernel: md/raid10: check slab-out-of-bounds in md_bitmap_get_counter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-17 15:03:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/raid10: check slab-out-of-bounds in md_bitmap_get_counter

If we write a large number to md/bitmap_set_bits, md_bitmap_checkpage()
will return -EINVAL because 'page >= bitmap->pages', but the return value
was not checked immediately in md_bitmap_get_counter() in order to set
*blocks value and slab-out-of-bounds occurs.

Move check of 'page >= bitmap->pages' to md_bitmap_get_counter() and
return directly if true.
Comment 1 Jon Moroney 2025-09-17 18:32:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091721-CVE-2023-53357-15aa@gregkh/T