Kernel-level bug in Linux core infrastructure; affects widely used systems; could crash or corrupt memory, disrupting operations.
CVE-2026-43208
Linux kernel RPS flow_id bug may crash kernel.
Is CVE-2026-43208 being exploited?
Not confirmed. CVE-2026-43208 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 0.48% probability of exploitation in the next 30 days.
How severe is CVE-2026-43208?
CVE-2026-43208 is rated Critical with a CVSS score of 9.8. 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-2026-43208?
Yes. A fix has been recorded for CVE-2026-43208. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43208 affect?
CVE-2026-43208 affects Linux kernel. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43208?
Apply patch, update kernel, reboot.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Flow_id miscalc in set_rps_cpu may cause kernel crash or memory corruption, with DoS risk.
Patch when possible
- affected>= 48aa30443e52c9666d5cd5e67532e475f212337e and < 5455a232edea6b946b99449f15ca771a8874a5a6
- affected>= 48aa30443e52c9666d5cd5e67532e475f212337e and < ed712dc0d64dee5f0d05e4d8ca57711f8a9c850c
- affected>= 48aa30443e52c9666d5cd5e67532e475f212337e and < 8a8a9fac9efa6423fd74938b940cb7d731780718
- affected6.18
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.