CVE-2026-74390

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/irdma: Fix out-of-bounds write in irdma_copy_user_pgaddrs The irdma_copy_user_pgaddrs function loops through all of the umem DMA blocks to populate the PBLEs and will stop when either the last DMA block is reached or palloc->total_cnt is reached. The issue is that the logic for checking palloc->total_cnt would only work for non-zero values. When irdma_setup_pbles is called with lvl==0, it calls irdma_copy_user_pgaddrs with palloc->total_cnt==0, which means the only way to break out of the loop is to reach the last umem DMA block, which means it could end up going beyond the fixed size of 4 iwmr->pgaddrmem array that is used in the lvl==0 case. In the case of QP/CQ/SRQ rings, the value of lvl is determined by a separate input (for example, req.cq_pages in the case of a CQ). So, we must perform explicit checking to ensure we don't overflow the pgaddrmem array if the user provides a umem that consists of more blocks than their provided req.cq_pages.

Gravité et risque d'exploitation

CVE-2026-74390 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <4780f58672ee6328accd54a95f9c00683477e499, 0, <=7.1.*, <5.14, <5ebb3ed757be3e04cf803026004aa0beaeb13e9b, 6.1.178, b48c24c2d710cf34810c555dcef883a3d35a9c08, 6.12.97, <=6.6.*, 5.14, <abd27a977b419d584efa659488c22d2306987b29, <79a20a8e201a779224b4bf115250a7713bde72c0, <9f8f0d2099e3de1194e37dc933ae0c4206b09aaf, <=6.18.*, 5.15.212, <192a3be0e3759daa24af2841208b074ca6dbaabc, 6.6.145, <424d51d33c7541a86934067c2c0538124687fc90, <=*, <=5.15.*, 7.2) 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/4780f58672ee6328accd54a95f9c00683477e499
• https://git.kernel.org/stable/c/79a20a8e201a779224b4bf115250a7713bde72c0
• https://git.kernel.org/stable/c/9f8f0d2099e3de1194e37dc933ae0c4206b09aaf
• https://git.kernel.org/stable/c/192a3be0e3759daa24af2841208b074ca6dbaabc
• https://git.kernel.org/stable/c/424d51d33c7541a86934067c2c0538124687fc90
• https://git.kernel.org/stable/c/abd27a977b419d584efa659488c22d2306987b29
• https://git.kernel.org/stable/c/5ebb3ed757be3e04cf803026004aa0beaeb13e9b