CVE-2026-43378

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

State: Published
Severity: 9.8 Critical
Published: May 8, 2026
Updated: Aug 5, 2026
Reserved: May 1, 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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before e1b21e6066615e7d3d3a7aa2677e415e563fd7ccAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b720c84087cb547f23ce03eab93568c1769e4556Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 54b48ae83de8bb06e65079d96368efe359d4909cAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 190e5f808e8058640b408ccfed25440b441a718aAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 1e689a56173827669a35da7cb2a3c78ed5c53680Affected
LinuxLinux	5.15Affected before 5.15Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.78 through 6.12.Not affected 6.18.19 through 6.18.Not affected 6.19.9 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before e1b21e6066615e7d3d3a7aa2677e415e563fd7ccAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b720c84087cb547f23ce03eab93568c1769e4556Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 54b48ae83de8bb06e65079d96368efe359d4909cAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 190e5f808e8058640b408ccfed25440b441a718aAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 1e689a56173827669a35da7cb2a3c78ed5c53680Affected

LinuxLinux

5.15Affected
before 5.15Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.78 through 6.12.*Not affected
6.18.19 through 6.18.*Not affected
6.19.9 through 6.19.*Not affected
7.0 and laterNot affected

References

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