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Review reviewHigh

CVE-2025-37899

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

CVSS
7.8
EPSS
0.93%
57.1% percentile
CISA KEV
Not listed
Published
2025.05.21
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.93%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 0626e6641f6b467447c81dd7678a69c66f7746cf < 931dc8a3670f71c45c0b1379ea4e92dafbda1aca, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 70ad6455139e26e85f48f95d0e21f351c1909342, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < d5ec1d79509b3ee01de02c236f096bc050221b7f, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 02d16046cd11a5c037b28c12ffb818c56dd3ef43, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 2fc9feff45d92a92cd5f96487655d5be23fb7e2b, >= 5.15, >= 5.15 < 6.12.28, >= 6.13 < 6.14.6, 6.15
Fixed versions
6.12.28, 6.14.6

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