CVE-2026-43379critical

CVE-2026-43379: critical vulnerability in Linux

ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()

Published · Updated

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.7%
exploitation probability
0.7%top 50% of all CVEs
observed exploitation
nono source reports it
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
Linux · Linux
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References
https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25