In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel
Redhat
  • Enterprise Linux

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:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 9
kernel-0:5.14.0-570.12.1.el9_6 cpe:/a:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
kernel-0:5.14.0-570.12.1.el9_6 cpe:/o:redhat:enterprise_linux:9 RHSA-2025:6966 2025-05-13T00:00:00Z
References
Link Providers
https://git.kernel.org/stable/c/91751e248256efc111e52e15115840c35d85abaf cve-icon cve-icon
https://git.kernel.org/stable/c/9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e cve-icon cve-icon
https://git.kernel.org/stable/c/b52e50dd4fabd12944172bd486a4f4853b7f74dd cve-icon cve-icon
https://git.kernel.org/stable/c/bc9c49341f9728c31fe248c5fbba32d2e81a092b cve-icon cve-icon
https://git.kernel.org/stable/c/c23d1d4f8efefb72258e9cedce29de10d057f8ca cve-icon cve-icon
https://git.kernel.org/stable/c/daeac89cdb03d30028186f5ff7dc26ec8fa843e7 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025013157-CVE-2025-21666-465a@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21666 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21666 cve-icon
History

Wed, 01 Oct 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

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

Type Values Removed Values Added
Metrics epss

{'score': 0.00039}

 epss

{'score': 0.00043}

Fri, 11 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00027}

 epss

{'score': 0.00039}

Wed, 14 May 2025 03:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux

Mon, 03 Feb 2025 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-476
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Sun, 02 Feb 2025 10:30:00 +0000

Type Values Removed Values Added
References

Sat, 01 Feb 2025 02:00:00 +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

Moderate

Fri, 31 Jan 2025 11:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.
Title vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-01-31T11:25:31.138Z

Updated: 2025-10-01T19:57:12.729Z

Reserved: 2024-12-29T08:45:45.733Z

Link: CVE-2025-21666

cve-icon Vulnrichment

Updated: 2025-10-01T15:58:19.420Z

cve-icon NVD

Status : Modified

Published: 2025-01-31T12:15:27.763

Modified: 2025-10-01T20:18:17.717

Link: CVE-2025-21666

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-01-31T00:00:00Z

Links: CVE-2025-21666 - Bugzilla