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Review reviewHigh

CVE-2025-68817

Linux Linux, linux kernel

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
7.8
EPSS
0.40%
32.8% percentile
CISA KEV
Not listed
Published
2026.01.14
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.40%
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c < 446beed646b2e426dd53d27358365f8678e1dd01, >= 7b58ee8d0b91359554cf219cd4f33872ea2afd66 < d092de8a26c952379ded8e6b0bda31d89befac1a, >= 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e < d64977495e44855f2b28d8ce56107c963a7a50e4, >= 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e < 21a3d01fc6db5129f81edb0ab7cb94fd758bcbea, >= 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e < 063cbbc6f595ea36ad146e1b7d2af820894beb21, >= 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e < b39a1833cc4a2755b02603eec3a71a85e9dff926, >= 5.15.145 < 5.15.199, >= 6.1.71 < 6.1.160, >= 6.6, >= 6.6.1 < 6.6.120, >= 6.7 < 6.12.64, >= 6.13 < 6.18.3, 6.6
Fixed versions
5.15.199, 6.1.160, 6.6.120, 6.12.64, 6.18.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416