Core OS infrastructure; Linux kernel is widely deployed and a netfilter memory-read risk could disrupt networks.
CVE-2026-43452
Linux kernel netfilter option walkers unsafe tail-read; fixed by added bounds check.
Is CVE-2026-43452 being exploited?
Not confirmed. CVE-2026-43452 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-2026-43452?
CVE-2026-43452 is rated High with a CVSS score of 8.2. 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-2026-43452?
Yes. A fix has been recorded for CVE-2026-43452. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43452 affect?
CVE-2026-43452 affects Linux kernel (netfilter xt_tcpudp, xt_dccp). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43452?
Update to patched kernel and reboot
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Potential kernel memory read via crafted netfilter options; may cause information disclosure or kernel crash.
Patch when possible
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < c2a445367a496a3c25dbc940c10c8bd1cfd4c14a
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < ae1e1267650638136b84c23f2b31250f0ccb6823
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < c39f84e4be1be63fc60ca7141ea7b76edcea5907
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < 9b94f0e42ed248eb31929da84ed9f5310d7ff540
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < 5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < bc18551c6169eac5ed813778d3e3e484002dbbe5
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < d04800323336eebf441d153f43234eac9b833d36
- affected>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc and < cfe770220ac2dbd3e104c6b45094037455da81d4
- affected2.6.16
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.