What is CVE-2026-43384?

CVE-2026-43384 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-05-08.

How severe is CVE-2026-43384?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Linux

CVE-2026-43384

In the Linux kernel, the following vulnerability has been resolved: net/tcp-ao: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 0a3a809089eb1d4a0a2fd0c16b520d603988c859, 6.7, 0
Linux Linux_kernel — versions 7.0

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-2026-43384?: CVE-2026-43384 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-05-08.
How severe is CVE-2026-43384?: Critical severity. CVSS v3 base score is 9.8 out of 10.