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Exploited vulnerability · CISA KEV

Is CVE-2025-38352 exploited? Yes: in CISA KEV since 4 Sep 2025

Gociux · Linux Kernel · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-38352, Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 4 Sep 2025, 44 days after it was published. It affects Linux Kernel. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 4 Sep 2025
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity7.8CVSS 3.1 · high
US federal due25 Sep 2025BOD 22-01 deadline

What it is

Linux kernel contains a time-of-check time-of-use (TOCTOU) race condition vulnerability that has a high impact on confidentiality, integrity, and availability.

VendorLinux (32 exploited CVEs in KEV)
ProductKernel
VulnerabilityLinux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability
WeaknessCWE-367
Published22 Jul 2025
Added to KEV4 Sep 2025
Reported by (CNA)Linux

What to do

  1. Check whether you run it. Look for Kernel in your asset inventory, including appliances and cloud images. Stack check lists every exploited Linux CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Jul 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Linux.

Other exploited CVEs in Kernel

References

Questions

Is CVE-2025-38352 being exploited?

Yes. CISA added CVE-2025-38352 to the Known Exploited Vulnerabilities catalog on 4 Sep 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-38352 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-38352?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Linux's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Kernel and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2025 · Linux scorecard · act-now radar.

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