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Critical 9.8Published May 8, 2026
CVE-2026-43378smb: server: fix use-after-free in smb2_open()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before e1b21e6066615e7d3d3a7aa2677e415e563fd7cc; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b720c84087cb547f23ce03eab93568c1769e4556; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 54b48ae83de8bb06e65079d96368efe359d4909c; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 190e5f808e8058640b408ccfed25440b441a718a; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 1e689a56173827669a35da7cb2a3c78ed5c53680 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7ccpatch
- https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556patch
- https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909cpatch
- https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07patch
- https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718apatch
- https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.