CVE-2025-68171

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-12-16. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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: 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 non-AMX task resumes and reloads XSTATE with init values, a warning is triggered due to a mismatch between fpstate::xfd and the CPU's current XFD state. fpu__clear_user_states() does not currently re-synchronize the XFD state after such preemption.

Invoke xfd_update_state() which detects and corrects the mismatch if there is a dynamic feature.

This also benefits the sigreturn path, as fpu__restore_sig() may call fpu__clear_user_states() when the sigframe is inaccessible.

[ dhansen: minor changelog munging ]

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

December 16, 2025

Last Modified

July 30, 2026

Advisory Details (5)

Auto-updated Jul 31, 2026
No patch confirmed yet.
generic

x86/fpu: Ensure XFD state on signal delivery - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eefbfb722042fc9210d2e0ac2b063fd1abf51895
generic

x86/fpu: Ensure XFD state on signal delivery - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5b2619b488f1d08b960c43c6468dd0759e8b3035
generic

x86/fpu: Ensure XFD state on signal delivery - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3f735419c4b43cde42e6d408db39137b82474e31
generic

x86/fpu: Ensure XFD state on signal delivery - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/388eff894d6bc5f921e9bfff0e4b0ab2684a96e9
generic

x86/fpu: Ensure XFD state on signal delivery - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1811c610653c0cd21cc9add14595b7cffaeca511

Vendor Advisories for CVE-2025-68171(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure-6.17 (6.17.0-1008.8) @ questing2026-05-21ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-14.14) @ questing2026-05-21ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1011.11) @ noble2026-05-21ubuntu
ubuntulinux-tools-gcp-64k-6.17 (6.17.0-1007.7) @ questing2026-05-21ubuntu
ubuntulinux-tools-oracle-64k-6.17 (6.17.0-1007.7) @ questing2026-05-21ubuntu
ubuntulinux-virtual-6.8 (6.8.0-106.106) @ noble2026-05-21ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1052.55+fips1) @ noble2026-05-21ubuntu
ubuntulinux-tools-realtime-6.8.1 (6.8.1-1045.46) @ noble2026-05-21ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy2026-05-21ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1052.58+fips1) @ noble2026-05-21ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1051.57) @ noble2026-05-21ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2040.41) @ noble2026-05-21ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1049.52.1) @ noble2026-05-21ubuntu
ubuntulinux-tools-aws-edge (6.8.0-1050.53~22.04.1) @ jammy2026-05-21ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1029.30) @ noble2026-05-21ubuntu
linuxKernel @ 6.1.159—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(15)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-08-01 04:15 UTCEPSS rescore
  2. 2026-07-30 16:27 UTCEPSS rescore
  3. 2026-07-30 06:48 UTCEG score recompute
  4. 2026-07-30 06:48 UTCGHSA enrichment
  5. 2026-07-30 06:23 UTCEG score recompute▲ 7.80
  6. 2026-07-30 06:22 UTCGHSA enrichment
  7. 2026-07-30 06:18 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  8. 2026-07-30 01:30 UTCEPSS rescore
  9. 2026-07-27 14:13 UTCEPSS rescore
  10. 2026-07-27 04:39 UTCOSV refresh
  11. 2026-07-26 14:54 UTCEPSS rescore
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  16. 2026-07-23 03:02 UTCEG score recompute
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  1. 2026-07-16 17:02 UTCEPSS rescore
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  10. 2026-07-11 08:27 UTCEPSS rescore
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  12. 2026-07-09 23:18 UTCOSV refresh
  13. 2026-07-09 19:10 UTCEPSS rescore
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  15. 2026-07-07 13:46 UTCEPSS rescore
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  25. 2026-06-28 14:07 UTCEPSS rescore
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  27. 2026-06-28 04:56 UTCEPSS rescore
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  30. 2026-06-25 13:49 UTCEPSS rescore
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  35. 2026-06-22 14:25 UTCEPSS rescore
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  37. 2026-06-21 09:31 UTCOSV refresh
  38. 2026-06-21 01:59 UTCEPSS rescore
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  40. 2026-06-19 19:25 UTCEPSS rescore
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  45. 2026-06-16 17:52 UTCEPSS rescore
  46. 2026-06-15 17:48 UTCEPSS rescore
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  48. 2026-06-14 23:18 UTCEPSS rescore
  49. 2026-06-13 23:00 UTCEPSS rescore
  50. 2026-06-13 23:00 UTCEPSS rescore
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  60. 2026-06-06 13:47 UTCEPSS rescore
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  68. 2026-06-02 20:13 UTCEPSS rescore
  69. 2026-06-02 20:12 UTCEPSS rescore
  70. 2026-06-02 00:09 UTCOSV refresh
  71. 2026-06-01 13:51 UTCEPSS rescore
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  73. 2026-05-31 22:30 UTCEPSS rescore
  74. 2026-05-31 22:30 UTCEPSS rescore
  75. 2026-05-31 00:16 UTCEPSS rescore

Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2025-68171?
CVE-2025-68171 is a high vulnerability published on December 16, 2025. 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 xfdvalidatestate+0x65/0x70 Call Trace: <TASK> fpuclearuserstates+0x9c/0x100…
When was CVE-2025-68171 disclosed?
CVE-2025-68171 was first published in the National Vulnerability Database on December 16, 2025, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-68171 actively exploited?
CVE-2025-68171 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.7% of all scored CVEs.
What is the CVSS score of CVE-2025-68171?
CVE-2025-68171 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-68171?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-68171, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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