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EVULNABLE
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CVE-2025-39964

Linux — Linux Kernel Race Condition Vulnerability

CISA KEV · in the CISA KEV catalog since 2026-09-18

CISA federal deadline · Overdue by 26 daysCISA KEVActively Exploited

What EVULNABLE says

Listed in the CISA KEV catalog, and an EPSS probability of 0.014.

  • CISA KEV: applied
  • Ransomware: did not apply
  • Vendor exploitation: did not apply
  • EPSS: applied
  • Microsoft Exploitability Index: did not apply
  • Pre-patch disclosure: did not apply
  • KEV recency: applied
  • CVSS: applied

Patch This Cycle

The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.

The evidence behind it

MeasureValueSourceWhat it means
CVSS base score 3.3 NVD
Also scored: CNA-assigned CVSS (NVD not yet scored) 7.8 		How severe the flaw is in itself. It does not say how likely an attack is.
FIRST EPSS 0.014 (71.3rd pctl) FIRST FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs.
Actively exploited Confirmed CISA KEV Whether a source of record has confirmed attacks using it in the wild.
Ransomware campaign use Unknown or none CISA KEV Whether CISA has seen ransomware operators use it.
CISA remediation deadline 2026-09-21 — CISA federal deadline · Overdue by 26 days CISA KEV The date US federal agencies must have fixed or mitigated it.
Fixed in Red Hat Enterprise Linux BaseOS (v. 8) -> bpftool-0:4.18.0-553.166.1.el8_10.aarch64 | Red Hat Enterprise Linux NFV (v. 8) -> kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10.src | Red Hat Enterprise Linux AppStream (v. 9) -> kernel-64k-debug-debuginfo-0:5.14.0-687.50.1.el9_8.aarch64 | Red Hat Enterprise Linux AppStream (v. 10) -> kernel-64k-debug-debuginfo-0:6.12.0-211.58.1.el10_2.aarch64 | Red Hat Enterprise Linux AppStream EUS (v. 10.0) -> kernel-64k-debug-debuginfo-0:6.12.0-55.106.1.el10_0.aarch64 | Red Hat Enterprise Linux AppStream EUS (v.9.6) -> kernel-64k-debug-debuginfo-0:5.14.0-570.143.1.el9_6.aarch64 | Red Hat Enterprise Linux BaseOS AUS (v.8.4) -> bpftool-0:4.18.0-305.209.1.el8_4.x86_64 | Red Hat Enterprise Linux AppStream E4S (v.9.4) -> bpftool-debuginfo-0:7.3.0-427.152.1.el9_4.aarch64 | Red Hat Enterprise Linux BaseOS AUS (v.8.6) -> bpftool-0:4.18.0-372.218.1.el8_6.x86_64 | Red Hat Enterprise Linux BaseOS E4S (v.8.8) -> bpftool-0:4.18.0-477.170.1.el8_8.ppc64le | Red Hat Enterprise Linux AppStream E4S (v.9.2) -> bpftool-debuginfo-0:7.0.0-284.194.1.el9_2.aarch64 | Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) -> kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.src | Red Hat Enterprise Linux for Real Time (v. 7 ELS) -> kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7.src | Red Hat Enterprise Linux Server (v. 7 ELS) -> bpftool-0:3.10.0-1160.164.1.el7.ppc64 | NVIDIA for RHEL 10 -> kernel-0:6.12.0-231.20.el10nv.aarch64 | NVIDIA for RHEL 10 -> kernel-0:6.12.0-259.27.el10nv.aarch64 | SUSE Liberty Linux 9 -> kernel-0:5.14.0-687.50.1.el9_8.x86_64 | SUSE Liberty Linux 8 -> bpftool-0:4.18.0-553.168.1.el8_10.x86_64 | SUSE Liberty Linux 7 LTSS -> bpftool-0:3.10.0-1160.164.1.el7.x86_64 | SUSE Liberty Linux 10 -> kernel-0:6.12.0-211.61.1.el10_2.x86_64 | SUSE Linux Micro Extras 6.2 -> kernel-obs-build-0:6.12.0-160000.37.1.aarch64 | SUSE Linux Micro 6.2 -> kernel-64kb-0:6.12.0-160000.37.1.aarch64 | SUSE Linux Enterprise Server 16.0 -> cluster-md-kmp-default-0:6.12.0-160000.37.1.ppc64le | SUSE Linux Enterprise High Availability Extension 16.0 -> cluster-md-kmp-default-0:6.12.0-160000.37.1.ppc64le | SUSE Linux Micro 6.0 -> kernel-devel-rt-0:6.4.0-52.1.noarch | SUSE Linux Micro 6.0 -> kernel-default-0:6.4.0-52.1.aarch64 | SUSE Linux Micro 6.1 -> kernel-devel-rt-0:6.4.0-52.1.noarch | SUSE Linux Micro 6.1 -> kernel-default-0:6.4.0-52.1.aarch64 | SUSE Linux Enterprise Live Patching 15 SP7 -> kernel-livepatch-6_4_0-150700_7_75-rt-0:1-150700.1.3.1.x86_64 | SUSE Linux Enterprise High Performance Computing 12 SP5 -> cluster-md-kmp-default-0:4.12.14-122.328.1.aarch64 | SUSE Linux Enterprise Live Patching 15 SP6 -> kernel-default-livepatch-0:6.4.0-150600.23.135.1.ppc64le | SUSE Linux Enterprise Micro 5.5 -> kernel-devel-rt-0:5.14.21-150500.13.164.1.noarch | SUSE Linux Enterprise Micro 5.3 -> kernel-rt-0:5.14.21-150400.15.189.1.x86_64 | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS -> cluster-md-kmp-default-0:5.14.21-150500.55.192.2.aarch64 | Open Enterprise Server 23.4 -> kernel-64kb-0:5.14.21-150400.24.243.1.aarch64 | openSUSE Leap 16.0 -> cluster-md-kmp-64kb-0:6.12.0-160000.37.1.aarch64 | linux -> 6.1.158-1 | linux -> 6.16.9-1 | linux -> 6.12.57-1 NVD The version(s) the vendor has published as fixed, where NVD records one.
Public exploit module None known Metasploit Module existing is not the same as active exploitation.
EUVD cross-reference Listed ENISA EUVD ENISA's own vulnerability database entry for this CVE, where one exists.

Impacted software or hardware

  • linux kernel Operating system — >= 2.6.38 < 5.10.245, >= 5.11 < 5.15.194, >= 5.16 < 6.1.154, >= 6.2 < 6.6.108, >= 6.7 < 6.12.49, >= 6.13 < 6.16.9, 6.17
  • simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware Operating system — >= 3.1.6
  • simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware Operating system — >= 3.1.6
  • simatic s7-1500 cpu 1518-4 pn\/dp mfp Hardware
  • simatic s7-1500 cpu 1518f-4 pn\/dp mfp Hardware

Fixed versions: Red Hat Enterprise Linux BaseOS (v. 8) -> bpftool-0:4.18.0-553.166.1.el8_10.aarch64 | Red Hat Enterprise Linux NFV (v. 8) -> kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10.src | Red Hat Enterprise Linux AppStream (v. 9) -> kernel-64k-debug-debuginfo-0:5.14.0-687.50.1.el9_8.aarch64 | Red Hat Enterprise Linux AppStream (v. 10) -> kernel-64k-debug-debuginfo-0:6.12.0-211.58.1.el10_2.aarch64 | Red Hat Enterprise Linux AppStream EUS (v. 10.0) -> kernel-64k-debug-debuginfo-0:6.12.0-55.106.1.el10_0.aarch64 | Red Hat Enterprise Linux AppStream EUS (v.9.6) -> kernel-64k-debug-debuginfo-0:5.14.0-570.143.1.el9_6.aarch64 | Red Hat Enterprise Linux BaseOS AUS (v.8.4) -> bpftool-0:4.18.0-305.209.1.el8_4.x86_64 | Red Hat Enterprise Linux AppStream E4S (v.9.4) -> bpftool-debuginfo-0:7.3.0-427.152.1.el9_4.aarch64 | Red Hat Enterprise Linux BaseOS AUS (v.8.6) -> bpftool-0:4.18.0-372.218.1.el8_6.x86_64 | Red Hat Enterprise Linux BaseOS E4S (v.8.8) -> bpftool-0:4.18.0-477.170.1.el8_8.ppc64le | Red Hat Enterprise Linux AppStream E4S (v.9.2) -> bpftool-debuginfo-0:7.0.0-284.194.1.el9_2.aarch64 | Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) -> kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.src | Red Hat Enterprise Linux for Real Time (v. 7 ELS) -> kernel-rt-0:3.10.0-1160.164.1.rt56.1316.el7.src | Red Hat Enterprise Linux Server (v. 7 ELS) -> bpftool-0:3.10.0-1160.164.1.el7.ppc64 | NVIDIA for RHEL 10 -> kernel-0:6.12.0-231.20.el10nv.aarch64 | NVIDIA for RHEL 10 -> kernel-0:6.12.0-259.27.el10nv.aarch64 | SUSE Liberty Linux 9 -> kernel-0:5.14.0-687.50.1.el9_8.x86_64 | SUSE Liberty Linux 8 -> bpftool-0:4.18.0-553.168.1.el8_10.x86_64 | SUSE Liberty Linux 7 LTSS -> bpftool-0:3.10.0-1160.164.1.el7.x86_64 | SUSE Liberty Linux 10 -> kernel-0:6.12.0-211.61.1.el10_2.x86_64 | SUSE Linux Micro Extras 6.2 -> kernel-obs-build-0:6.12.0-160000.37.1.aarch64 | SUSE Linux Micro 6.2 -> kernel-64kb-0:6.12.0-160000.37.1.aarch64 | SUSE Linux Enterprise Server 16.0 -> cluster-md-kmp-default-0:6.12.0-160000.37.1.ppc64le | SUSE Linux Enterprise High Availability Extension 16.0 -> cluster-md-kmp-default-0:6.12.0-160000.37.1.ppc64le | SUSE Linux Micro 6.0 -> kernel-devel-rt-0:6.4.0-52.1.noarch | SUSE Linux Micro 6.0 -> kernel-default-0:6.4.0-52.1.aarch64 | SUSE Linux Micro 6.1 -> kernel-devel-rt-0:6.4.0-52.1.noarch | SUSE Linux Micro 6.1 -> kernel-default-0:6.4.0-52.1.aarch64 | SUSE Linux Enterprise Live Patching 15 SP7 -> kernel-livepatch-6_4_0-150700_7_75-rt-0:1-150700.1.3.1.x86_64 | SUSE Linux Enterprise High Performance Computing 12 SP5 -> cluster-md-kmp-default-0:4.12.14-122.328.1.aarch64 | SUSE Linux Enterprise Live Patching 15 SP6 -> kernel-default-livepatch-0:6.4.0-150600.23.135.1.ppc64le | SUSE Linux Enterprise Micro 5.5 -> kernel-devel-rt-0:5.14.21-150500.13.164.1.noarch | SUSE Linux Enterprise Micro 5.3 -> kernel-rt-0:5.14.21-150400.15.189.1.x86_64 | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS -> cluster-md-kmp-default-0:5.14.21-150500.55.192.2.aarch64 | Open Enterprise Server 23.4 -> kernel-64kb-0:5.14.21-150400.24.243.1.aarch64 | openSUSE Leap 16.0 -> cluster-md-kmp-64kb-0:6.12.0-160000.37.1.aarch64 | linux -> 6.1.158-1 | linux -> 6.16.9-1 | linux -> 6.12.57-1

Remediation: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Remediation basis: CISA KEV required action

ENISA EUVD also lists this CVE at CVSS 7.8 (v3.1), assigned by Linux. Source: euvd.enisa.europa.eu.

23 days recorded, 2026-09-24 to 2026-10-16

1.36% as of 2026-10-16 (71.3rd percentile). FIRST EPSS, recorded daily since this page started tracking it.

2026-09-24 2026-10-16

What CISA says to do

The primary records

This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.

NVD ↗ CISA KEV ↗ Vendor Advisory ↗

Where this sits

CVE-2025-39964 is one of the entries ranked on the priority feed and in the non-Microsoft advisories.