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CVE-2025-21898

MEDIUMCVSS 5.5/10EPSS 0.18%

Last modified

CVE-2025-21898 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ftrace: Avoid potential division by zero in function_stat_show() Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Avoid potential division by zero in function_stat_show() Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.

Metrics

CVSS 3.1
5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.18%

8.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
LinuxLinux Kernel>= 3.16.83, < 3.17—
LinuxLinux Kernel>= 4.4.206, < 4.5—
LinuxLinux Kernel>= 4.9.209, < 4.10—
LinuxLinux Kernel>= 4.14.163, < 4.15—
LinuxLinux Kernel>= 4.19.94, < 4.20—
LinuxLinux Kernel>= 5.4.9, < 5.4.291—
LinuxLinux Kernel>= 5.5, < 5.10.235—
LinuxLinux Kernel>= 5.11, < 5.15.179—
LinuxLinux Kernel>= 5.16, < 6.1.130—
LinuxLinux Kernel>= 6.2, < 6.6.81—
LinuxLinux Kernel>= 6.7, < 6.12.18—
LinuxLinux Kernel>= 6.13, < 6.13.6—
LinuxLinux Kernel6.14Rc1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2025-21898?
In the Linux kernel, the following vulnerability has been resolved: ftrace: Avoid potential division by zero in function_stat_show() Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.
How severe is CVE-2025-21898?
CVE-2025-21898 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2025-21898?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21898?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST