In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable. This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion. The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.

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.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50 cve-icon cve-icon
https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8 cve-icon cve-icon
https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85 cve-icon cve-icon
https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380 cve-icon cve-icon
https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca cve-icon cve-icon
https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919 cve-icon cve-icon
https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e cve-icon cve-icon
https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc cve-icon cve-icon
https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025041819-CVE-2025-38637-8e27@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-38637 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-38637 cve-icon
History

Wed, 23 Apr 2025 15:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-617

Sat, 19 Apr 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, 18 Apr 2025 07:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: net_sched: skbprio: Remove overly strict queue assertions In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable. This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion. The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.
Title net_sched: skbprio: Remove overly strict queue assertions
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-04-18T07:01:34.564Z

Updated: 2025-04-18T07:01:34.564Z

Reserved: 2025-04-16T04:51:24.030Z

Link: CVE-2025-38637

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-04-18T07:15:43.823

Modified: 2025-04-21T14:23:45.950

Link: CVE-2025-38637

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-04-18T00:00:00Z

Links: CVE-2025-38637 - Bugzilla