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Vulnerability record · CVE-2026-43379 · published 8 May 2026

CVE-2026-43379: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.65% · top 50.8% CWE-416 · Use after free
9.8CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-43379), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.