CVE-2026-43379

CRITICAL EPSS 35.5%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
35.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥6.6.32  –  <6.6.130
linuxlinux_kernel*≥6.9  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25
    Patch