What is CVE-2026-63864?

CVE-2026-63864 is a high-severity vulnerability in Linux. CVSS score: 8.4/10. Published 2026-07-19.

How severe is CVE-2026-63864?

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

Vulnerability in Linux

CVE-2026-63864

In the Linux kernel, the following vulnerability has been resolved: bpf: Propagate error from visit_tailcall_insn Commit e40f5a6bf88a ("bpf: correct stack liveness for tail calls") added visit_tailcall_insn() but did not check its return…

EPSS: 0.001 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Linux — versions e40f5a6bf88a781d5f81bc6b8aab9ac31d8c98dd, 6.19, 0

References

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

Frequently asked questions

What is CVE-2026-63864?: CVE-2026-63864 is a high-severity vulnerability in Linux. CVSS score: 8.4/10. Published 2026-07-19.
How severe is CVE-2026-63864?: High severity. CVSS v3 base score is 8.4 out of 10.