What is CVE-2025-21851?

CVE-2025-21851 is a low-severity vulnerability in Linux, classified under Improper Locking. CVSS score: 3.3/10. Published 2025-03-12.

How severe is CVE-2025-21851?

Low severity. CVSS v3 base score is 3.3 out of 10.

Is CVE-2025-21851 known to be exploited?

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

Vulnerability in Linux

CVE-2025-21851

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix softlockup in arena_map_free on 64k page kernel On an aarch64 kernel with CONFIG_PAGE_SIZE_64KB=y, arena_htab tests cause a segmentation fault and soft lockup. …

EPSS: 0.001 (4.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Linux — versions 317460317a02a1af512697e6e964298dedd8a163, 6.9, 0
Linux Linux_kernel — versions 6.9, 6.14

Weakness classification (CWE)

CWE-667 — Improper Locking

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)

Frequently asked questions

What is CVE-2025-21851?: CVE-2025-21851 is a low-severity vulnerability in Linux, classified under Improper Locking. CVSS score: 3.3/10. Published 2025-03-12.
How severe is CVE-2025-21851?: Low severity. CVSS v3 base score is 3.3 out of 10.
Is CVE-2025-21851 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.