In the Linux kernel, the following vulnerability has been resolved:
arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP
On system with SME, a thread's kernel FPSIMD state may be erroneously
clobbered during a context switch immediately after that state is
restored. Systems without SME are unaffected.
If the CPU happens to be in streaming SVE mode before a context switch
to a thread with kernel FPSIMD state, fpsimd_thread_switch() will
restore the kernel FPSIMD state using fpsimd_load_kernel_state() while
the CPU is still in streaming SVE mode. When fpsimd_thread_switch()
subsequently calls fpsimd_flush_cpu_state(), this will execute an
SMSTOP, causing an exit from streaming SVE mode. The exit from
streaming SVE mode will cause the hardware to reset a number of
FPSIMD/SVE/SME registers, clobbering the FPSIMD state.
Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel
FPSIMD state.
References
Configurations
Configuration 1 (hide)
|
History
20 Nov 2025, 19:28
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02 - Patch | |
| References | () https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20 - Patch | |
| References | () https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682 - Patch | |
| CWE | NVD-CWE-noinfo | |
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
Information
Published : 2025-07-03 09:15
Updated : 2025-11-20 19:28
NVD link : CVE-2025-38169
Mitre link : CVE-2025-38169
CVE.ORG link : CVE-2025-38169
JSON object : View
Products Affected
linux
- linux_kernel
CWE