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🛡️ CVE-2022-50425 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

x86/fpu: Fix copy_xstate_to_uabi() to copy init states correctly

In the Linux kernel, the following vulnerability has been resolved:

x86/fpu: Fix copy_xstate_to_uabi() to copy init states correctly

When an extended state component is not present in fpstate, but in init

state, the function copies from init_fpstate via copy_feature().

But, dynamic states are not present in init_fpstate because of all-zeros

init states. Then retrieving them from init_fpstate will explode like this:

BUG: kernel NULL pointer dereference, address: 0000000000000000

...

RIP: 0010:memcpy_erms+0x6/0x10

? __copy_xstate_to_uabi_buf+0x381/0x870

fpu_copy_guest_fpstate_to_uabi+0x28/0x80

kvm_arch_vcpu_ioctl+0x14c/0x1460 [kvm]

? __this_cpu_preempt_check+0x13/0x20

? vmx_vcpu_put+0x2e/0x260 [kvm_intel]

kvm_vcpu_ioctl+0xea/0x6b0 [kvm]

? kvm_vcpu_ioctl+0xea/0x6b0 [kvm]

? __fget_light+0xd4/0x130

__x64_sys_ioctl+0xe3/0x910

? debug_smp_processor_id+0x17/0x20

? fpregs_assert_state_consistent+0x27/0x50

do_syscall_64+0x3f/0x90

entry_SYSCALL_64_after_hwframe+0x63/0xcd

Adjust the 'mask' to zero out the userspace buffer for the features that

are not available both from fpstate and from init_fpstate.

The dynamic features depend on the compacted XSAVE format. Ensure it is

enabled before reading XCOMP_BV in init_fpstate.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2022-50425 is recorded against 2 packages.

  • kernel (from 5.16.0 up to 6.0.7)
  • linux-kernel

Timeline and source

Published on 1 October 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2022-50425 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-10-01
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 5.16.0 6.0.7
linux-kernel — —

Similar Threats

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