Affects the Linux kernel (core infrastructure) with CVSS 9.1; reboot risk across enterprises.
CVE-2026-43197
Linux kernel netconsole OOB read via non-null-terminated msg.
Is CVE-2026-43197 being exploited?
Not confirmed. CVE-2026-43197 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-2026-43197?
CVE-2026-43197 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-2026-43197?
Yes. A fix has been recorded for CVE-2026-43197. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43197 affect?
CVE-2026-43197 affects Linux kernel. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43197?
Update to patched kernel and reboot; disable netconsole if unused.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attacker could trigger an out-of-bounds read in netconsole, risking kernel memory corruption or crash.
Patch when possible
- affected>= c62c0a17f9b7398022f9eebe547878033264f81f and < 8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9
- affected>= c62c0a17f9b7398022f9eebe547878033264f81f and < 3126a2f98beaec5a554a1fb31c46db1e8542665e
- affected>= c62c0a17f9b7398022f9eebe547878033264f81f and < 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58
- affected>= c62c0a17f9b7398022f9eebe547878033264f81f and < 82aec772fca2223bc5774bd9af486fd95766e578
- affected6.6
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.