Critical 9.8Published Jan 13, 2026

CVE-2025-68817ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

Updated under an hour ago (Oct 27, 2026, 2:10 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

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

Affected products

Linux Linux linux:linux (from the name)	from dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c before 446beed646b2e426dd53d27358365f8678e1dd01; from 7b58ee8d0b91359554cf219cd4f33872ea2afd66 before d092de8a26c952379ded8e6b0bda31d89befac1a; from 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e before d64977495e44855f2b28d8ce56107c963a7a50e4; 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e builds before 21a3d01fc6db5129f81edb0ab7cb94fd758bcbea; from 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e before 063cbbc6f595ea36ad146e1b7d2af820894beb21; from 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e before b39a1833cc4a2755b02603eec3a71a85e9dff926; from 5.15.145 before 5.15.199; from 6.1.71 before 6.1.160	CNA record
linux linux_kernel linux:linux_kernel	from 5.15.145 before 5.15.199; from 6.1.71 before 6.1.160; from 6.6.1 before 6.6.120; from 6.7 before 6.12.64; from 6.13 before 6.18.3; 6.6; 6.6; 6.6; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/446beed646b2e426dd53d27358365f8678e1dd01	patch
https://git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a	patch
https://git.kernel.org/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4	patch
https://git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea	patch
https://git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21	patch
https://git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926	patch

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.