CVE-2026-46043
Vulnérabilité critique dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv rxe_rcv() currently checks only that the incoming packet is at least header_size(pkt) bytes long before payload_size() is used. However, payload_size() subtracts both the attacker-controlled BTH pad field and RXE_ICRC_SIZE from pkt->paylen: payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt) - RXE_ICRC_SIZE This means a short packet can still make payload_size() underflow even if it includes enough bytes for the fixed headers. Simply requiring header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a packet with a forged non-zero BTH pad can still leave payload_size() negative and pass an underflowed value to later receive-path users. Fix this by validating pkt->paylen against the full minimum length required by payload_size(): header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE.
Gravité et risque d'exploitation
CVE-2026-46043 obtient un score CVSS de 9.1/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.51 %, ce qui la place devant 42.5 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions 7.0.4, <=6.1.*, <=7.0.*, <=6.12.*, 0, 6.18.27, <2c0d71ef12f46c57d37bc571f3f2797db7eb50cc, 5.15.209, <=5.10.*, <=6.6.*, <5fedefec757192dcaad29a664ac332c7601be144, 6.1.175, 7.1, <9b924f3a26b21330a837cfe72e819b6393bbeeaa, <2fd4f8b749309a61c3f3f88ee8891d94f79e1240, <=6.18.*, <7244491dab347f648e661da96dc0febadd9daec3, 5.10.258, <e8ee0e792d475b1067c199ef0af1b6221fa6f43d, 4.8, <c4376c672c3648d5bdc31dfffc329d07164f93c4, <=*, <=5.15.*, <f83519a4c122c9c7a850a2197648a9ff4c67c520, <4.8, 6.6.140, 6.12.86, 8700e3e7c4857d28ebaa824509934556da0b3e76) 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/c4376c672c3648d5bdc31dfffc329d07164f93c4
- https://git.kernel.org/stable/c/5fedefec757192dcaad29a664ac332c7601be144
- https://git.kernel.org/stable/c/2c0d71ef12f46c57d37bc571f3f2797db7eb50cc
- https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240
- https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520
- https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa
- https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d
- https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3
