CVE-2026-52934

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded.

Gravité et risque d'exploitation

CVE-2026-52934 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.24 %, ce qui la place devant 14.6 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.93, <3.13, <1595628a2f877d052eda18865ccf539392c47c04, <94db72e9dac202e017ee3db22c59d17e4f3bf171, 0, 6.1.176, 5.15.210, <f50487e3566358b2b982b7801945e858c78ad9ab, <=5.10.*, <=6.6.*, <13493b00dd1e05a705981e052158652ea23eb482, <c02aa6c0c9d1bea9bb75dea362b75ad225137bae, <94a3d72cd9b21116d7c6d5bdc57c11401fc28557, 6.18.34, 7.1, <ede47988ac5687793745b17c1634a496a2299919, <=6.18.*, 3.13, ef26157747d42254453f6b3ac2bd8bd3c53339c3, 7.0.11, <=*, <=5.15.*, 6.6.143, <6448a49344e87487b61bd88cb850cd694a0f576d, 5.10.259) 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/c02aa6c0c9d1bea9bb75dea362b75ad225137bae
• https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04
• https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d
• https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482
• https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171
• https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919
• https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557
• https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab