CVE-2026-43378

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

HIGH

7.8

CVSS Score

Published: May 8, 2026 at 02:21 PM UTC

Updated: August 5, 2026 at 01:24 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

5.15 ≤ v < 6.1.1675.15 ≤ v < 6.12.785.15 ≤ v < 6.18.195.15 ≤ v < 6.19.95.15 ≤ v < 6.6.1305.15 ≤ v < 7.06.13 ≤ v < 6.18.196.19 ≤ v < 6.19.96.2 ≤ v < 6.6.1306.7 ≤ v < 6.12.785.15 7.0 rc1 7.0 rc2 7.0 rc3e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9

Vendor states this is fixed in 190e5f808e8058640b408ccfed25440b441a718a (fixed)

Vendor states this is fixed in 1e689a56173827669a35da7cb2a3c78ed5c53680 (fixed)

Vendor states this is fixed in 54b48ae83de8bb06e65079d96368efe359d4909c (fixed)

Vendor states this is fixed in 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07 (fixed)

Vendor states this is fixed in b720c84087cb547f23ce03eab93568c1769e4556 (fixed)

Vendor states this is fixed in e1b21e6066615e7d3d3a7aa2677e415e563fd7cc (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 6.1.167 (unaffected)

Vendor states this is fixed in 6.12.78 (unaffected)

Vendor states this is fixed in 6.18.19 (unaffected)

Vendor states this is fixed in 6.19.9 (unaffected)

Vendor states this is fixed in 6.6.130 (unaffected)