CVE-2026-43379 | In the Linux kernel, the following vulnerability has been re… | CVSS 9.8 CRITICAL

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close() opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being accessed after rcu_read_unlock() has been called. This creates a race condition where the memory could be freed by a concurrent writer between the unlock and the subsequent pointer dereferences (opinfo->is_lease, etc.), leading to a use-after-free.

Metadata

CVE ID: CVE-2026-43379
State: PUBLISHED
Assigner: Linux
Reserved: 2026-05-01 14:12 UTC
Published: 2026-05-08 14:21 UTC
Last updated: 2026-05-23 16:06 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	27b40b7bfcd121fe13a150ffe11957630cf49246 < bf4d66d72e4a9e268c1012c331ce9eaedb5e2086, 5fb282ba4fef8985a5acf2b32681f2ec07732561 < 960699317d39f46611f4ebeb69edc567c1f4e6b6, 5fb282ba4fef8985a5acf2b32681f2ec07732561 < dbbd328cf58261ca239756fe1c0d10c9518d3399, 5fb282ba4fef8985a5acf2b32681f2ec07732561 < b3568347c51c46e2cabc356bc34676df98296619 …
Linux	Linux	—	6.9, 0 < 6.9, 6.6.130 ≤ 6.6., 6.12.78 ≤ 6.12. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (5)