CVE-2026-43378
Critical
smb: server: fix use-after-free in smb2_open()
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.
Exploit probability
0.3%
Published
May 8, 2026
Required by
Not available
Last source change
August 12, 2026
02 / AFFECTED SOFTWARE
Affected packages
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2026-43378
View original source
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- 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
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43378.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-43378