What is CVE-2025-21966?

CVE-2025-21966 is a high-severity vulnerability in Linux, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2025-04-01.

How severe is CVE-2025-21966?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2025-21966 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Linux

CVE-2025-21966

In the Linux kernel, the following vulnerability has been resolved: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature Fix memory corruption due to incorrect parameter being passed to bio_init

Vulnerability class: Buffer Overflow

EPSS: 0.002 (8.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 1d9a943898533e83f20370c0e1448d606627522e, 6.5, 0
Linux Linux_kernel — versions 6.14

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2025-21966?: CVE-2025-21966 is a high-severity vulnerability in Linux, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2025-04-01.
How severe is CVE-2025-21966?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2025-21966 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.