by Kastro
Paper/Archive/CVE-2026-43378

CVE-2026-43378

Linux Linux — smb: server: fix use-after-free in smb2_open()

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
34
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 23.7.237 × 204.7No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < e1b21e6066615e7d3d3a7aa2677e415e563fd7cce1b21e6066615e7d3d3a7aa2677e415e563fd7ccCNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < b720c84087cb547f23ce03eab93568c1769e4556b720c84087cb547f23ce03eab93568c1769e4556CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 54b48ae83de8bb06e65079d96368efe359d4909c54b48ae83de8bb06e65079d96368efe359d4909cCNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 8f5b1a7cb009a93c48e9e334a2f59a660f9afc078f5b1a7cb009a93c48e9e334a2f59a660f9afc07CNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 190e5f808e8058640b408ccfed25440b441a718a190e5f808e8058640b408ccfed25440b441a718aCNA
Linuxe2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 1e689a56173827669a35da7cb2a3c78ed5c536801e689a56173827669a35da7cb2a3c78ed5c53680CNA
Linux5.15–CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgit.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7ccrefgit.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556refgit.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909crefgit.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07refgit.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718arefgit.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680