What is CVE-2026-63909?

CVE-2026-63909 is a high-severity vulnerability in Linux. CVSS score: 8.1/10. Published 2026-07-19.

How severe is CVE-2026-63909?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Linux

CVE-2026-63909

In the Linux kernel, the following vulnerability has been resolved: ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops Commit d07b26f39246 ("ksmbd: require minimum ACE size in smb_check_perm_dacl()") introduced a transpos…

EPSS: 0.002 (11.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Linux — versions 282cbbb476b9f35793452bc461934af4c7eca169, f20adc4ef7428bc485ee83fd1a592252fb87718b, 325d4ac11f526cb8964cff14548ccf02d8c756d8

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

Frequently asked questions

What is CVE-2026-63909?: CVE-2026-63909 is a high-severity vulnerability in Linux. CVSS score: 8.1/10. Published 2026-07-19.
How severe is CVE-2026-63909?: High severity. CVSS v3 base score is 8.1 out of 10.