What’s Vulnerable › Vulnerabilities

CVE-2026-63864: bpf: Propagate error from visit_tailcall_insn

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-26

Description

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 value.

Affected products

• Linux kernel: from 6.19 before 7.0.10 — fixed in 7.0.10
• Linux kernel: 6.19 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 7.0.10; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6bd96e40f31dde8f8cd79772b4df0f171cf8a915
• https://git.kernel.org/stable/c/945816e63c8677cf4bfde963a0774432ce8afc85

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