CVE-2025-38169

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  3. CVE-2025-38169

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

I

n 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
Link Resource
https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02 Patch
https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20 Patch
https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

20 Nov 2025, 19:28

Type Values Removed Values Added
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02 - () https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02 - Patch
References () https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20 - () https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20 - Patch
References () https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682 - () https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682 - Patch

03 Jul 2025, 15:13

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64/fpsimd: Evite afectar negativamente al estado FPSIMD del kernel con SMSTOP En sistemas con SMSTOP, el estado FPSIMD del kernel de un subproceso puede verse afectado negativamente durante un cambio de contexto inmediatamente después de restaurarse dicho estado. Los sistemas sin SMSTOP no se ven afectados. Si la CPU está en modo SVE de transmisión antes de un cambio de contexto a un subproceso con estado FPSIMD del kernel, fpsimd_thread_switch() restaurará el estado FPSIMD del kernel mediante fpsimd_load_kernel_state() mientras la CPU sigue en modo SVE de transmisión. Cuando fpsimd_thread_switch() llama posteriormente a fpsimd_flush_cpu_state(), se ejecutará un SMSTOP, lo que provocará la salida del modo SVE de transmisión. La salida del modo SVE de transmisión provocará que el hardware restablezca varios registros FPSIMD/SVE/SME, afectando negativamente al estado FPSIMD. Solucione esto llamando a fpsimd_flush_cpu_state() antes de restaurar el estado FPSIMD del kernel.

03 Jul 2025, 09:15

Type Values Removed Values Added
New CVE
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

CWE
NVD-CWE-noinfo