Linux Kernel AMDXDNA Flexible Array Bounds Check Vulnerability
CVE-2026-98146 Published on September 25, 2026
accel/amdxdna: Remove __counted_by from struct amdxdna_cmd_chain
In the Linux kernel, the following vulnerability has been resolved:
accel/amdxdna: Remove __counted_by from struct amdxdna_cmd_chain
struct amdxdna_cmd_chain contains a flexible array annotated with
__counted_by(command_count). Since the structure is stored in shared
AMDXDNA_BO_SHARE memory, userspace can modify command_count concurrently.
If command_count is changed to zero, the bounds check generated from
__counted_by may fail and trigger a kernel panic.
Remove __counted_by to avoid relying on the userspace-controlled
command_count for the flexible array bounds check.
Products Associated with CVE-2026-98146
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Affected Versions
Linux:- Version aac243092b707bb3018e951d470cc1a9bcbaba6c and below 93fa3e925b15b0ded0a549fe7f12bfbb1c4e171a is affected.
- Version aac243092b707bb3018e951d470cc1a9bcbaba6c and below 52f3e086760a9a3e02a46a10b57caffd73b1c204 is affected.
- Version aac243092b707bb3018e951d470cc1a9bcbaba6c and below b3709d354545e70388177500761f92d906c4dfd6 is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.