CVE-2025-38169arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP
Updated under an hour ago ()
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from e92bee9f861b466c676f0200be3e46af7bc4ac6b before 55d52af498daea75aa03ba9b7e444c8ae495ac20; from e92bee9f861b466c676f0200be3e46af7bc4ac6b before a305821f597ec943849d3e53924adb88c61ed682; from e92bee9f861b466c676f0200be3e46af7bc4ac6b before 01098d893fa8a6edb2b56e178b798e3e6b674f02; e003c485ac82a9f8de4204912ed059ac6dd4257c; 25b90cd122d546823da90b916f7c3289dfe83a99; from 6.8.12 before 6.9; from 6.9.3 before 6.10 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.8.12 before 6.9; from 6.9.3 before 6.12.34; from 6.13 before 6.15.3 | NVD |
References
- https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20patch
- https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682patch
- https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.