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CVE-2025-38721

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <=6.16.*, 2.6.18, 6.17, 0, <de788b2e6227462b6dcd0e07474e72c089008f74, <=6.15.*, 5.4.297, 6.6.103, <2.6.18, <19b909a4b1452fb97e477d2f08b97f8d04095619, <=5.10.*, <=6.6.*, <586892e341fbf698e7cbaca293e1353957db725a, 5.15.190, <30cf811058552b8cd0e98dff677ef3f89d6d34ce, <=5.4.*, 6.12.43, <e14f72aa66c029db106921d621edcedef68e065b, <962518c6ca9f9a13df099cafa429f72f68ad61f0, 6.1.149, 6.16.2, <a62d6aa3f31f216b637a4c71b7a8bfc7c57f049b, d205dc40798d97d63ad348bfaf7394f445d152d4, 5.10.241, <=*, <=5.15.*, <41462f4cfc583513833f87f9ee55d12da651a7e3, <a2cb4df7872de069f809de2f076ec8e54d649fe3, 6.15.11

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: fix refcount leak on table dump There is a reference count leak in ctnetlink_dump_table(): if (res < 0) { nf_conntrack_get(&ct->ct_general); // HERE cb->args[1] = (unsigned long)ct; ... While its very unlikely, its possible that ct == last. If this happens, then the refcount of ct was already incremented. This 2nd increment is never undone. This prevents the conntrack object from being released, which in turn keeps prevents cnet->count from dropping back to 0. This will then block the netns dismantle (or conntrack rmmod) as nf_conntrack_cleanup_net_list() will wait forever. This can be reproduced by running conntrack_resize.sh selftest in a loop. It takes ~20 minutes for me on a preemptible kernel on average before I see a runaway kworker spinning in nf_conntrack_cleanup_net_list. One fix would to change this to: if (res < 0) { if (ct != last) nf_conntrack_get(&ct->ct_general); But this reference counting isn't needed in the first place. We can just store a cookie value instead. A followup patch will do the same for ctnetlink_exp_dump_table, it looks to me as if this has the same problem and like ctnetlink_dump_table, we only need a 'skip hint', not the actual object so we can apply the same cookie strategy there as well.

Gravité et risque d'exploitation

CVE-2025-38721 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 0.17 %, ce qui la place devant 6.0 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <=6.16.*, 2.6.18, 6.17, 0, <de788b2e6227462b6dcd0e07474e72c089008f74, <=6.15.*, 5.4.297, 6.6.103, <2.6.18, <19b909a4b1452fb97e477d2f08b97f8d04095619, <=5.10.*, <=6.6.*, <586892e341fbf698e7cbaca293e1353957db725a, 5.15.190, <30cf811058552b8cd0e98dff677ef3f89d6d34ce, <=5.4.*, 6.12.43, <e14f72aa66c029db106921d621edcedef68e065b, <962518c6ca9f9a13df099cafa429f72f68ad61f0, 6.1.149, 6.16.2, <a62d6aa3f31f216b637a4c71b7a8bfc7c57f049b, d205dc40798d97d63ad348bfaf7394f445d152d4, 5.10.241, <=*, <=5.15.*, <41462f4cfc583513833f87f9ee55d12da651a7e3, <a2cb4df7872de069f809de2f076ec8e54d649fe3, 6.15.11) 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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