CVE-2026-43378
Published May 8, 2026
Modified May 12, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: fix use-after-free in smb2_open() The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is dereferenced after rcu_read_unlock(), creating a use-after-free window.
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EPSS — Exploit Prediction
0.0003
Probability of exploitation
0.08%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718a
https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680
https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909c
https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07
https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556
https://git.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc
Frequently Asked Questions
What is CVE-2026-43378? +
In the Linux kernel, the following vulnerability has been resolved:
smb: server: fix use-after-free in smb2_open()
The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is
dereferenced after rcu_read_unlock(), creating a use-after-free
window.
How do I check if I'm vulnerable to CVE-2026-43378? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.