CVE-2025-38637

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.

Gravité et risque d'exploitation

CVE-2025-38637 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.33 %, ce qui la place devant 24.5 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, aea5f654e6b78a0c976f7a25950155932c77a53f, <864ca690ff135078d374bd565b9872f161c614bc, <=6.12.*, <=6.14.*, <7abc8318ce0712182bf0783dcfdd9a6a8331160e, 5.15.180, <2f35b7673a3aa3d09b3eb05811669622ebaa98ca, 0, 6.14.2, 4.19, 6.1.134, <2286770b07cb5268c03d11274b8efd43dff0d380, <034b293bf17c124fec0f0e663f81203b00aa7a50, <32ee79682315e6d3c99947b3f38b078a09a66919, <=5.10.*, <=6.6.*, 6.6.87, 6.13.11, 6.12.23, <ce8fe975fd99b49c29c42e50f2441ba53112b2e8, <=5.4.*, 6.15, 5.10.236, <4.19, <1284733bab736e598341f1d3f3b94e2a322864a8, <=*, <=5.15.*, 5.4.292, <1dcc144c322a8d526b791135604c0663f1af9d85, <=6.13.*) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e
• https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8
• https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919
• https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85
• https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc
• https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca
• https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380
• https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50
• https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8