[BUG] WARNING in do_sve_acc in Linux kernel v6.6

[Luka]

Dear Kernel Maintainers,

I am writing to report a potential vulnerability identified in the
upstream Linux Kernel version v6.6, corresponding to the following
commit in the mainline repository:

Git Commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa (tag: v6.6)

This issue was discovered during the testing of the Android 15 AOSP
kernel, which is based on Linux kernel version 6.6, specifically from
the AOSP kernel branch:

AOSP kernel branch: android15-6.6
Manifest path: kernel/common.git
Source URL:  https://android.googlesource.com/kernel/common/+/refs/heads/android15-6.6

Although this kernel branch is used in Android 15 development, its
base is aligned with the upstream Linux v6.6 release. I observed this
issue while conducting stability and fuzzing tests on the Android 15
platform and identified that the root cause lies in the upstream
codebase.


Bug Location:  do_sve_acc+0x17c/0x3f4 arch/arm64/kernel/fpsimd.c:1479

Bug Report: https://hastebin.com/share/calarosado.css

Entire Log: https://hastebin.com/share/efepocaxoh.perl


Thank you very much for your time and attention. I sincerely apologize
that I am currently unable to provide a reproducer for this issue.
However, I am actively working on reproducing the problem, and I will
make sure to share any findings or reproducing steps with you as soon
as they are available.

I greatly appreciate your efforts in maintaining the Linux kernel and
your attention to this matter.

Best regards,
Luka