TI-2025-25510 Aliases CVE-2025-38169 GHSA-m2xh-87px-jgff

arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP

LOW 35Published 2025-07-03 · Updated 2026-10-15

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00176 7th percentileScored 2026-11-07

Fix Partial Linux (Linux): 6.9, 6.10, 6.12.34 +2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	6.8.12 to before 6.9; 6.9.3 to before 6.10	6.9, 6.10	Patch available	CNA
Linux	Linux	6.10 and later	6.12.34, 6.15.3, 6.16	Patch available	CNA

Linux VendorLinux Affected 6.8.12 to before 6.9; 6.9.3 to before 6.10 Fixed in 6.9, 6.10 Patch available CNA
Linux VendorLinux Affected 6.10 and later Fixed in 6.12.34, 6.15.3, 6.16 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	6.8.12 to before 6.9; 6.9.3 to before 6.12.34; 6.13 to before 6.15.3	Vulnerable	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.8.12 to before 6.9; 6.9.3 to before 6.12.34; 6.13 to before 6.15.3 Vulnerable ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 6.9, 6.10
Fix · CNA Linux (Linux) Fixed in 6.12.34, 6.15.3, 6.16

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Not affected: 3 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2025-38169
2026-10-03 Alias added: GHSA-m2xh-87px-jgff
2026-10-16 CISA SSVC decision points changed

References

Patch 3

TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3

See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences