Bug 2536794 (CVE-2026-90134) - CVE-2026-90134 kernel: ntfs: fix kmap_local_page() usage in compress
Summary: CVE-2026-90134 kernel: ntfs: fix kmap_local_page() usage in compress
Keywords:
Status: NEW
Alias: CVE-2026-90134
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 19:34 UTC by OSIDB Bzimport
Modified: 2026-10-13 12:49 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


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Description OSIDB Bzimport 2026-09-17 19:34:03 UTC
In the Linux kernel, the following vulnerability has been resolved:

ntfs: fix kmap_local_page() usage in compress

Several compressed I/O paths discard the address returned by
kmap_local_page() and later access or unmap the page using page_address().
This is invalid for highmem pages, and local mappings must also be unmapped
using the address returned by kmap_local_page().

Map each destination page in ntfs_decompress() only while producing the
current sub-block. Use memcpy_from_page(), memcpy_to_page(), and
memzero_page() for the other page accesses. Remove unnecessary local
mappings from ntfs_write_cb(), where pages are accessed through the vmap()
mapping.


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