CVE-2025-21781

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix panic during interface removal Reference counting is used to ensure that batadv_hardif_neigh_node and batadv_hard_iface are not freed before/during batadv_v_elp_throughput_metric_update work is finished. But there isn't a guarantee that the hard if will remain associated with a soft interface up until the work is finished. This fixes a crash triggered by reboot that looks like this: Call trace: batadv_v_mesh_free+0xd0/0x4dc [batman_adv] batadv_v_elp_throughput_metric_update+0x1c/0xa4 process_one_work+0x178/0x398 worker_thread+0x2e8/0x4d0 kthread+0xd8/0xdc ret_from_fork+0x10/0x20 (the batadv_v_mesh_free call is misleading, and does not actually happen) I was able to make the issue happen more reliably by changing hardif_neigh->bat_v.metric_work work to be delayed work. This allowed me to track down and confirm the fix. [sven@narfation.org: prevent entering batadv_v_elp_get_throughput without soft_iface]

Gravité et risque d'exploitation

CVE-2025-21781 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 0.22 %, ce qui la place devant 12.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <ccb7276a6d26d6f8416e315b43b45e15ee7f29e2, <522b1596ea19e327853804da2de60aeb9c5d6f42, <=6.12.*, 0, <4.6, <ce3f1545bf8fa28bd05ec113679e8e6cd23af577, <7eb5dd201695645af071592a50026eb780081a72, 6.14, <072b2787321903287a126c148e8db87dd7ef96fe, <=5.10.*, <=6.6.*, 6.1.129, 6.12.16, <=5.4.*, 4.6, 5.4.291, 6.13.4, 5.15.179, <f0a16c6c79768180333f3e41ce63f32730e3c3af, <2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7, <=*, <=5.15.*, <167422a07096a6006599067c8b55884064fa0b72, 5.10.235, <=6.13.*, c833484e5f3872a38fe232c663586069d5ad9645, 6.6.79) 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/167422a07096a6006599067c8b55884064fa0b72
• https://git.kernel.org/stable/c/ce3f1545bf8fa28bd05ec113679e8e6cd23af577
• https://git.kernel.org/stable/c/f0a16c6c79768180333f3e41ce63f32730e3c3af
• https://git.kernel.org/stable/c/7eb5dd201695645af071592a50026eb780081a72
• https://git.kernel.org/stable/c/072b2787321903287a126c148e8db87dd7ef96fe
• https://git.kernel.org/stable/c/2c3fb7df4cc6d043f70d4a8a10f8b915bbfb75e7
• https://git.kernel.org/stable/c/522b1596ea19e327853804da2de60aeb9c5d6f42
• https://git.kernel.org/stable/c/ccb7276a6d26d6f8416e315b43b45e15ee7f29e2