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CVE-2022-50425

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

MEDIUM
5.5
CVSS Score
Published: October 1, 2025 at 11:42 AM UTC
Updated: June 17, 2026 at 05:23 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.16 ≤ v < 6.0.75.16 ≤ v < 6.12308ee57d93d896618dd65c996429c9d3e469fe05.166.1 rc1
Vendor states this is fixed in 471f0aa7fa64e23766a1473b32d9ec3f0718895a (fixed)
Vendor states this is fixed in 6ff29642fd28965a8f8d6d326ac91bf6075f3113 (fixed)
Vendor states this is fixed in 5.16 (unaffected)
Vendor states this is fixed in 6.0.7 (unaffected)
Vendor states this is fixed in 6.1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch
Source: cverecord
https://git.kernel.org/stable/c/6ff29642fd28965a8f8d6d326ac91bf6075f3113
Patch
Source: cverecord
https://git.kernel.org/stable/c/471f0aa7fa64e23766a1473b32d9ec3f0718895a

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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