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CVE-2026-43379

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CVE-2026-43379

Published: May 8, 2026

Modified: May 23, 2026

PUBLISHED

CVSS v3.1

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.

VendorProductVersions

Linux

Linux

affected
27b40b7bfcd121fe13a150ffe11957630cf49246 - < bf4d66d72e4a9e268c1012c331ce9eaedb5e2086
affected
5fb282ba4fef8985a5acf2b32681f2ec07732561 - < 960699317d39f46611f4ebeb69edc567c1f4e6b6
affected
5fb282ba4fef8985a5acf2b32681f2ec07732561 - < dbbd328cf58261ca239756fe1c0d10c9518d3399
affected
5fb282ba4fef8985a5acf2b32681f2ec07732561 - < b3568347c51c46e2cabc356bc34676df98296619
affected
5fb282ba4fef8985a5acf2b32681f2ec07732561 - < eac3361e3d5dd8067b3258c69615888eb45e9f25

+1 more versions

Linux

Linux

affected
6.9
unaffected
0 - < 6.9
unaffected
6.6.130 - <= 6.6.*
unaffected
6.12.78 - <= 6.12.*
unaffected
6.18.19 - <= 6.18.*

+2 more versions

CVSS v3.1 Details

CVSS v3.1 Vector

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

References

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