What is CVE-2026-63828?

CVE-2026-63828 is a high-severity vulnerability in Linux. CVSS score: 8.4/10. Published 2026-07-19.

How severe is CVE-2026-63828?

High severity. CVSS v3 base score is 8.4 out of 10.

Vulnerability in Linux

CVE-2026-63828

In the Linux kernel, the following vulnerability has been resolved: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection…

EPSS: 0.002 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Linux — versions cf60af03ca4e71134206809ea892e49b92a88896, 3.6, 0

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2026-63828?: CVE-2026-63828 is a high-severity vulnerability in Linux. CVSS score: 8.4/10. Published 2026-07-19.
How severe is CVE-2026-63828?: High severity. CVSS v3 base score is 8.4 out of 10.