Core Linux kernel issue with wide infra impact; could enable firewall bypass.
CVE-2026-46244
Linux kernel IPv6 inner header desync enables transport header forgery and firewall bypass.
Is CVE-2026-46244 being exploited?
Not confirmed. CVE-2026-46244 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 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-46244?
CVE-2026-46244 is rated Critical with a CVSS score of 9.1. 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-2026-46244?
Yes. A fix has been recorded for CVE-2026-46244. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-46244 affect?
CVE-2026-46244 affects Linux kernel 6.2+ (stable). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-46244?
Patch kernel to fixed version; reboot if needed
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Transport header forgery via crafted inner IPv6 headers could bypass firewall rules and enable spoofed traffic.
Immediate action required
- affected>= 3a07327d10a09379315c844c63f27941f5081e0a and < c161ad9157f5a0429b5ff94d9770faf3bf48d273
- affected>= 3a07327d10a09379315c844c63f27941f5081e0a and < 870d59e2cf218e7418491e26bad768cb16654582
- affected>= 3a07327d10a09379315c844c63f27941f5081e0a and < 689bbf48c1f45130086ae1c46ab83ea4c753c601
- affected>= 3a07327d10a09379315c844c63f27941f5081e0a and < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce
- affected>= 3a07327d10a09379315c844c63f27941f5081e0a and < b6a91f68ebfed9c38e0e9150f58a9b85da07181c
- affected6.2
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.