CVE-2026-64382
Linux kernel SMB client double-free enables kernel memory corruption (DoS/RCE).
Is CVE-2026-64382 being exploited?
Not confirmed. CVE-2026-64382 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-64382?
CVE-2026-64382 is rated High with a CVSS score of 8.8. 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-2026-64382?
Yes. A fix has been recorded for CVE-2026-64382. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64382 affect?
CVE-2026-64382 affects Linux kernel (SMB/CIFS client), Linux distributions with SMB client enabled, Clients using SMB2/SMB3 stacks. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64382?
Apply vendor kernel updates or upgrade to the patched kernel immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious SMB server can trigger a double-free in SMB2_open, causing kernel crash (DoS) or memory corruption that may enable privilege escalation or RCE.
Immediate action required
- affected>= 433042a91f9373241307725b52de573933ffedbf and < 02bc2896bdc3e29362d6e40d404006944a159c25
- affected>= 4f1fffa2376922f3d1d506e49c0fd445b023a28e and < 3196b5192f246df4272072f61a2f4a3e9967f55d
- affected>= 4f1fffa2376922f3d1d506e49c0fd445b023a28e and < 14498ff5ce0f272ce0ef988721413e06b7038972
- affected>= 4f1fffa2376922f3d1d506e49c0fd445b023a28e and < ff2d30927bc3bf3c629f0768d2068096e64ef5ce
- affected>= 4f1fffa2376922f3d1d506e49c0fd445b023a28e and < b55e182f2324bc6a604c21a47aa6c448f719a532
- affected>= 6.6.32 and < 6.6.145
- affected6.8
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.