CVE-2025-68817 in the critical feed json
ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency
published 2026-01-13 9 mo ago modified 2026-08-05 3 mo ago also EUVD-2026-2302
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 5.15.199, 6.1.160, 6.6.120, 6.12.64, 6.18.3, 6.19
- linux Debian 12 6.1.162-1
- linux Debian 13 6.12.69-1
- linux Debian 14 6.18.3-1
debian advisories DEBIAN-CVE-2025-68817
- linux Ubuntu 22.04 LTS 5.15.0-176.186
- linux Ubuntu 24.04 LTS 6.8.0-110.110
- linux Ubuntu 25.10 6.17.0-22.22
- linux-aws Ubuntu 22.04 LTS 5.15.0-1105.112
- linux-aws Ubuntu 24.04 LTS 6.8.0-1052.55
- linux-aws Ubuntu 25.10 6.17.0-1012.12
- linux-gcp Ubuntu 22.04 LTS 5.15.0-1105.114
- linux-gcp Ubuntu 24.04 LTS 6.8.0-1054.57
ubuntu advisories UBUNTU-CVE-2025-68817
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- git.kernel.org/stable/c/446beed646b2e426dd53d27358365f8678e1dd01 commit
- git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a commit
- git.kernel.org/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4 commit
- git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea commit
- git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21 commit
- git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2025-68817 updated cvss 7.8
kernel: ksmbd: Use-after-free vulnerability allows arbitrary code execution
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Weakness
-
- CWE-416 Use After Free
- Technology feeds
References
-
git.kernel.org
/stable/c/446beed646b2e426dd53d27358365f8678e1dd01
patch
-
git.kernel.org
/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a
patch
-
git.kernel.org
/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4
patch
-
git.kernel.org
/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea
patch
-
git.kernel.org
/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21
patch
-
git.kernel.org
/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926
patch
Sources
- CVE List CVE-2025-68817
- NVD CVE-2025-68817
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