Very high impact Linux kernel vulnerability; widely used core infrastructure, CVSS 9.1; could disrupt IT operations.
CVE-2026-43083
Linux kernel net ioam6 OOB access via RX queue mapping; potential kernel crash.
Is CVE-2026-43083 being exploited?
Not confirmed. CVE-2026-43083 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 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-43083?
CVE-2026-43083 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-2026-43083?
Yes. A fix has been recorded for CVE-2026-43083. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43083 affect?
CVE-2026-43083 affects Linux kernel. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43083?
Update to patched kernel version and reboot
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Out-of-bounds access in RX queue mapping could crash kernel; potential privilege escalation if exploited.
Patch when possible
- affected>= b63c5478e9cb1d1504eb02d9dac827ad24612b32 and < 6d1d9ed9b409e0662241e3d245d574a18f643494
- affected>= b63c5478e9cb1d1504eb02d9dac827ad24612b32 and < 95a1334748c95dd15546056280ade0c4b8dd7b78
- affected>= b63c5478e9cb1d1504eb02d9dac827ad24612b32 and < b30b1675aa2bcf0491fd3830b051df4e08a7c8ca
- affected5.17
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.