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

io_uring/kbuf: reallocate buf lists on upgrade

IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it
was created for legacy selected buffer and has been emptied. It violates
the requirement that most of the field should stay stable after publish.
Always reallocate it instead.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

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 0.00041.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

No data.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/146a185f6c05ee263db715f860620606303c4633 cve-icon cve-icon
https://git.kernel.org/stable/c/2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4 cve-icon cve-icon
https://git.kernel.org/stable/c/7d0dc28dae836caf7645fef62a10befc624dd17b cve-icon cve-icon
https://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025030706-CVE-2025-21836-b358@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-21836 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-21836 cve-icon
History

Wed, 02 Apr 2025 03:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}

 cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H'}

Thu, 27 Mar 2025 15:30:00 +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'}

threat_severity

Low

 cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}

threat_severity

Moderate

Sat, 08 Mar 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

Fri, 07 Mar 2025 09:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
Title io_uring/kbuf: reallocate buf lists on upgrade
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-04T07:22:09.559Z

Reserved: 2024-12-29T08:45:45.777Z

Link: CVE-2025-21836

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2025-03-07T09:15:16.600

Modified: 2025-03-07T09:15:16.600

Link: CVE-2025-21836

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-03-07T00:00:00Z

Links: CVE-2025-21836 - Bugzilla

cve-icon OpenCVE Enrichment

No data.