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Review reviewHigh

CVE-2025-68171

Linux

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure XFD state on signal delivery Sean reported [1] the following splat when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfd_validate_state+0x65/0x70 Call Trace: <TASK> fpu__clear_user_states+0x9c/0x100 arch_do_signal_or_restart+0x142/0x210 exit_to_user_mode_loop+0x55/0x100 do_syscall_64+0x205/0x2c0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Chao further identified [2] a reproducible scenario involving signal delivery: a non-AMX task is preempted by an AMX-enabled task which modifies the XFD MSR. When the no...

CVSS
7.8
EPSS
0.14%
3.51% percentile
CISA KEV
Not listed
Published
2025.12.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure XFD state on signal delivery Sean reported [1] the following splat when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfd_validate_state+0x65/0x70 Call Trace: <TASK> fpu__clear_user_states+0x9c/0x100 arch_do_signal_or_restart+0x142/0x210 exit_to_user_mode_loop+0x55/0x100 do_syscall_64+0x205/0x2c0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Chao further identified [2] a reproducible scenario involving signal delivery: a non-AMX task is preempted by an AMX-enabled task which modifies the XFD MSR. When the no...

Affected product and versions

Product
Linux
Affected versions
>= 672365477ae8afca5a1cca98c1deb733235e4525 < eefbfb722042fc9210d2e0ac2b063fd1abf51895, >= 672365477ae8afca5a1cca98c1deb733235e4525 < 1811c610653c0cd21cc9add14595b7cffaeca511, >= 672365477ae8afca5a1cca98c1deb733235e4525 < 5b2619b488f1d08b960c43c6468dd0759e8b3035, >= 672365477ae8afca5a1cca98c1deb733235e4525 < 3f735419c4b43cde42e6d408db39137b82474e31, >= 672365477ae8afca5a1cca98c1deb733235e4525 < 388eff894d6bc5f921e9bfff0e4b0ab2684a96e9, >= 5.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-68171 — Linux | SECUFOCUS NOW