Bug 2536572 (CVE-2026-90369) - CVE-2026-90369 kernel: wifi: mt76: fix out-of-bounds access in mmio copy helpers
Summary: CVE-2026-90369 kernel: wifi: mt76: fix out-of-bounds access in mmio copy helpers
Keywords:
Status: NEW
Alias: CVE-2026-90369
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 18:28 UTC by OSIDB Bzimport
Modified: 2026-10-27 10:36 UTC (History)
17 users (show)

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


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Description OSIDB Bzimport 2026-09-17 18:28:35 UTC
In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: fix out-of-bounds access in mmio copy helpers

mt76_mmio_write_copy() and mt76_mmio_read_copy() iterate up to
ALIGN(len, 4), so a length that is not a multiple of four reads past the
source buffer (write_copy) or writes past the destination (read_copy).
Copy the aligned body in the loop and handle the remaining tail through a
4-byte bounce buffer, keeping the register access width unchanged.


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