Description
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.
Published: 2025-05-20
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4436-1 linux-6.1 security update
EUVD EUVD EUVD-2025-15946 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.
Ubuntu USN Ubuntu USN USN-7649-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7649-2 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7650-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-7665-1 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7665-2 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-7721-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-2 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-4 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-5 Linux kernel (FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-6 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-7 Linux kernel (AWS FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-8 Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-8059-9 Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8125-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8126-1 Linux kernel (Azure) vulnerabilities
History

Sat, 06 Dec 2025 21:45:00 +0000


Wed, 19 Nov 2025 14:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00014}

epss

{'score': 0.00017}


Sat, 14 Jun 2025 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Sat, 24 May 2025 19:45:00 +0000


Wed, 21 May 2025 03:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low


Tue, 20 May 2025 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title ksmbd: fix use-after-free in session logoff
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-11T21:17:16.984Z

Reserved: 2025-04-16T04:51:23.965Z

Link: CVE-2025-37899

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2025-05-20T16:15:26.273

Modified: 2025-12-06T22:15:50.277

Link: CVE-2025-37899

cve-icon Redhat

Severity : Low

Publid Date: 2025-05-20T00:00:00Z

Links: CVE-2025-37899 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-06-27T09:26:51Z

Weaknesses