What is CVE-2026-64597?

CVE-2026-64597 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-08-06.

How severe is CVE-2026-64597?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Linux

CVE-2026-64597

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_close() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

EPSS: 0.004 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 7.2-rc1, 6.6.145, 433042a91f9373241307725b52de573933ffedbf

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2026-64597?: CVE-2026-64597 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-08-06.
How severe is CVE-2026-64597?: Critical severity. CVSS v3 base score is 9.8 out of 10.