CVE-2026-53671
eBPF verifier bug enables context overwrite and kernel pointer deref.
Is CVE-2026-53671 being exploited?
Not confirmed. CVE-2026-53671 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-53671?
CVE-2026-53671 is rated Critical with a CVSS score of 9.3. 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-2026-53671?
Yes. A fix has been recorded for CVE-2026-53671. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-53671 affect?
CVE-2026-53671 affects vbpf/prevail < 0.2.4, eBPF toolchains that use prevail for verification. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-53671?
Upgrade prevail to v0.2.4, avoid loading untrusted eBPF, audit eBPF toolchains
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypass verifier to write a context field, cause attacker-controlled pointer deref, enabling kernel memory corruption and potential local privilege escalation or code execution.
Immediate action required
- affected< 0.2.4
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.