CVE-2025-38169

MEDIUM EPSS 3.4%
Published Jul 3, 202512mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 3, 2025 12mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥6.8.12  –  <6.9
linuxlinux_kernel*≥6.9.3  –  <6.12.34
linuxlinux_kernel*≥6.13  –  <6.15.3

References 3

  • git.kernel.org https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682
    Patch