What is CVE-2025-21629?

CVE-2025-21629 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-01-15.

How severe is CVE-2025-21629?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2025-21629 known to be exploited?

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

Vulnerability in Linux

CVE-2025-21629

In the Linux kernel, the following vulnerability has been resolved: net: reenable NETIF_F_IPV6_CSUM offload for BIG TCP packets The blamed commit disabled hardware offoad of IPv6 packets with extension headers on devices that advertise N…

EPSS: 0.002 (10.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linux — versions 705350fbd6ed4b5d89ee045fa57a0594a72b17d7, a27a5c40ee4cbe00294e2c76160de5f2589061ba, 6.6.70
Linux Linux_kernel — versions 6.12, 6.13

Public proof-of-concept exploits

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)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-21629?: CVE-2025-21629 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-01-15.
How severe is CVE-2025-21629?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2025-21629 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.