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CVE-2025-38457

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <923a276c74e25073ae391e930792ac86a9f77f1e, <=6.1.*, <ffdde7bf5a439aaa1955ebd581f5c64ab1533963, <=6.12.*, 2.6.20, 0, 6.1.146, 6.15.7, 6.12.39, <=6.15.*, <=5.10.*, <=6.6.*, 5.10.240, 5.4.296, <=5.4.*, 6.16, <23c165dde88eac405eebb59051ea1fe139a45803, 6.6.99, 5.15.189, <90436e72c9622c2f70389070088325a3232d339f, <2.6.20, 5e50da01d0ce7ef0ba3ed6cfabd62f327da0aca6, <e28a383d6485c3bb51dc5953552f76c4dea33eea, <=*, <=5.15.*, <8ecd651ef24ab50123692a4e3e25db93cb11602a, <4c691d1b6b6dbd73f30ed9ee7da05f037b0c49af, <25452638f133ac19d75af3f928327d8016952c8e

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: Abort __tc_modify_qdisc if parent class does not exist Lion's patch [1] revealed an ancient bug in the qdisc API. Whenever a user creates/modifies a qdisc specifying as a parent another qdisc, the qdisc API will, during grafting, detect that the user is not trying to attach to a class and reject. However grafting is performed after qdisc_create (and thus the qdiscs' init callback) is executed. In qdiscs that eventually call qdisc_tree_reduce_backlog during init or change (such as fq, hhf, choke, etc), an issue arises. For example, executing the following commands: sudo tc qdisc add dev lo root handle a: htb default 2 sudo tc qdisc add dev lo parent a: handle beef fq Qdiscs such as fq, hhf, choke, etc unconditionally invoke qdisc_tree_reduce_backlog() in their control path init() or change() which then causes a failure to find the child class; however, that does not stop the unconditional invocation of the assumed child qdisc's qlen_notify with a null class. All these qdiscs make the assumption that class is non-null. The solution is ensure that qdisc_leaf() which looks up the parent class, and is invoked prior to qdisc_create(), should return failure on not finding the class. In this patch, we leverage qdisc_leaf to return ERR_PTRs whenever the parentid doesn't correspond to a class, so that we can detect it earlier on and abort before qdisc_create is called. [1] https://lore.kernel.org/netdev/d912cbd7-193b-4269-9857-525bee8bbb6a@gmail.com/

Gravité et risque d'exploitation

CVE-2025-38457 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 0.18 %, ce qui la place devant 7.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <923a276c74e25073ae391e930792ac86a9f77f1e, <=6.1.*, <ffdde7bf5a439aaa1955ebd581f5c64ab1533963, <=6.12.*, 2.6.20, 0, 6.1.146, 6.15.7, 6.12.39, <=6.15.*, <=5.10.*, <=6.6.*, 5.10.240, 5.4.296, <=5.4.*, 6.16, <23c165dde88eac405eebb59051ea1fe139a45803, 6.6.99, 5.15.189, <90436e72c9622c2f70389070088325a3232d339f, <2.6.20, 5e50da01d0ce7ef0ba3ed6cfabd62f327da0aca6, <e28a383d6485c3bb51dc5953552f76c4dea33eea, <=*, <=5.15.*, <8ecd651ef24ab50123692a4e3e25db93cb11602a, <4c691d1b6b6dbd73f30ed9ee7da05f037b0c49af, <25452638f133ac19d75af3f928327d8016952c8e) 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

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