CVE-2026-63864
Linux kernel BPF verifier bug may allow local kernel crash or privilege escalation.
Is CVE-2026-63864 being exploited?
Not confirmed. CVE-2026-63864 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.14% probability of exploitation in the next 30 days.
How severe is CVE-2026-63864?
CVE-2026-63864 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63864?
Yes. A fix has been recorded for CVE-2026-63864. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63864 affect?
CVE-2026-63864 affects Linux kernel (BPF subsystem), Linux distributions with unpatched kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63864?
Install vendor kernel updates ASAP; disable unprivileged BPF or restrict BPF access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attacker can craft BPF programs to bypass verifier, causing kernel crashes or escalate to root.
Patch when possible
- affected>= e40f5a6bf88a781d5f81bc6b8aab9ac31d8c98dd and < 945816e63c8677cf4bfde963a0774432ce8afc85
- affected>= e40f5a6bf88a781d5f81bc6b8aab9ac31d8c98dd and < 6bd96e40f31dde8f8cd79772b4df0f171cf8a915
- affected6.19
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.