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CVE-2026-43378smb: server: fix use-after-free in smb2_open()
- 9.8CriticalCVSS base score
- 0.31%Exploitation in 30 daysEPSS · top 76% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (13 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < e1b21e6066615e7d3d3a7aa2677e415e563fd7cc
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < b720c84087cb547f23ce03eab93568c1769e4556
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 54b48ae83de8bb06e65079d96368efe359d4909c
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 8f5b1a7cb009a93c48e9e334a2f59a660f9afc07
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 190e5f808e8058640b408ccfed25440b441a718a
- affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 – < 1e689a56173827669a35da7cb2a3c78ed5c53680
- affected 5.15
- unaffected < 5.15
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc (opens in a new tab)
- https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556 (opens in a new tab)
- https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909c (opens in a new tab)
- https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07 (opens in a new tab)
- https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718a (opens in a new tab)
- https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28684 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43378)Record last updated .