Linux kernel vulnerability affecting netfs/CIFS stack; kernel bugs are widespread and can disrupt many organizations and infrastructure.
CVE-2026-64061
Linux kernel netfs use-after-free in netfs_read_gaps enabling kernel compromise.
Is CVE-2026-64061 being exploited?
Not confirmed. CVE-2026-64061 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 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-64061?
CVE-2026-64061 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-2026-64061?
Yes. A fix has been recorded for CVE-2026-64061. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64061 affect?
CVE-2026-64061 affects Linux kernel (netfs/netfs_read_gaps), CIFS/SMB server (cifsd), Linux distributions with affected kernels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64061?
Apply vendor/distro kernel updates or upstream patch; restrict SMB/CIFS network exposure until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Memory corruption via CIFS/SMB recv path allowing kernel crash, privilege escalation, or remote code execution.
Immediate action required
- affected>= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and < 2a39d49c8d97df8cb8fa80c10859bc1ba7358c6b
- affected>= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and < d4f4bc87c76511cf2532448b0fa40c25e894bd7d
- affected>= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and < 412e8bad48967fd34295866636c028befd27d8b9
- affected>= ee4cdf7ba857a894ad1650d6ab77669cbbfa329e and < 3e5dd91b87a8b1450217b56a336bee315f40da7d
- affected6.12
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.