In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix use-after-free in smb2_lock

If smb_lock->zero_len has value, ->llist of smb_lock is not delete and
flock is old one. It will cause use-after-free on error handling
routine.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00017.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*

No data.

No data.

Advisories
Source ID Title
Debian DLA Debian DLA DLA-4193-1 linux-6.1 security update
Debian DSA Debian DSA DSA-5900-1 linux security update
EUVD EUVD EUVD-2025-9376 In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_lock If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine.
Ubuntu USN Ubuntu USN USN-7605-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7605-2 Linux kernel (Low Latency) vulnerabilities
Ubuntu USN Ubuntu USN USN-7606-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-7628-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7764-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7764-2 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7765-1 Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-7766-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-7767-1 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7767-2 Linux kernel (Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7779-1 Linux kernel (IBM) vulnerabilities
Ubuntu USN Ubuntu USN USN-7790-1 Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN Ubuntu USN USN-7800-1 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-1 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-7802-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-2 Linux kernel (Oracle) vulnerabilities
Ubuntu USN Ubuntu USN USN-7809-1 Linux kernel (Azure, N-Series) vulnerabilities
Ubuntu USN Ubuntu USN USN-7801-3 Linux kernel (Oracle) vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/410ce35a2ed6d0e114132bba29af49b69880c8c7 cve-icon cve-icon
https://git.kernel.org/stable/c/636e021646cf9b52ddfea7c809b018e91f2188cb cve-icon cve-icon
https://git.kernel.org/stable/c/84d2d1641b71dec326e8736a749b7ee76a9599fc cve-icon cve-icon
https://git.kernel.org/stable/c/8573571060ca466cbef2c6f03306b2cc7b883506 cve-icon cve-icon
https://git.kernel.org/stable/c/a0609097fd10d618aed4864038393dd75131289e cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html cve-icon
https://lore.kernel.org/linux-cve-announce/2025040136-CVE-2025-21945-d791@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21945 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21945 cve-icon
History

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Wed, 16 Apr 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Sat, 12 Apr 2025 03:00:00 +0000

Type Values Removed Values Added
Metrics threat_severity

Low

 threat_severity

Moderate

Thu, 10 Apr 2025 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-416
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Wed, 02 Apr 2025 14:00:00 +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, 01 Apr 2025 16:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb2_lock If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine.
Title ksmbd: fix use-after-free in smb2_lock
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-11-03T19:39:45.983Z

Reserved: 2024-12-29T08:45:45.790Z

Link: CVE-2025-21945

cve-icon Vulnrichment

Updated: 2025-11-03T19:39:45.983Z

cve-icon NVD

Status : Modified

Published: 2025-04-01T16:15:25.633

Modified: 2025-11-03T20:17:31.417

Link: CVE-2025-21945

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-04-01T00:00:00Z

Links: CVE-2025-21945 - Bugzilla

cve-icon OpenCVE Enrichment

No data.