CVE-2026-43378 PUBLISHED

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

Assigner: Linux
Reserved: 01.05.2026 Published: 08.05.2026 Updated: 09.05.2026

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.

Vendor	Linux
Product	Linux
Versions	Default: unaffected affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to e1b21e6066615e7d3d3a7aa2677e415e563fd7cc (excl.) affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to b720c84087cb547f23ce03eab93568c1769e4556 (excl.) affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to 54b48ae83de8bb06e65079d96368efe359d4909c (excl.) affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07 (excl.) affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to 190e5f808e8058640b408ccfed25440b441a718a (excl.) affected from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to 1e689a56173827669a35da7cb2a3c78ed5c53680 (excl.)

Vendor	Linux
Product	Linux
Versions	Default: affected Version 5.15 is affected unaffected from 0 to 5.15 (excl.) unaffected from 6.1.167 to 6.1.* (incl.) unaffected from 6.6.130 to 6.6.* (incl.) unaffected from 6.12.78 to 6.12.* (incl.) unaffected from 6.18.19 to 6.18.* (incl.) unaffected from 6.19.9 to 6.19.* (incl.) unaffected from 7.0 to * (incl.)