CVE-2026-98262
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY A user reported that commit 105c42566a55 ("ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585") made the JMicron JMB585 unusable on his board. The failure is seen as soon as the ahci driver is probed, and booting with iommu=off does not solve the problem. Looking at the AHCI specification, PxCLBU and PxFBU are both read only '0' for HBAs that do not support 64-bit addressing. For HBAs that do support 64-bit addressing, the registers are read write, with a reset value that is Implementation Specific. When using the AHCI_HFLAG_32BIT_ONLY flag, the HBA does support 64-bit addressing, and a 32-bit DMA mask is set by simply clearing HOST_CAP_64. Thus, in this case, we need to explicitly clear the registers to 0.
Gravité et risque d'exploitation
CVE-2026-98262 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 0.18 %, ce qui la place devant 7.5 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <b691a3e244278362e552439d6d3ee5a5d3703488, 0, <7912ad8fb5233bb8cfe21d50df639c7f4854ff9d, c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c, <a5a8b4737f68bbac8aa0685af0c8921e6003c22b, 6.12.112, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, 6.1.189, 7.2.8, <=6.18.*, 5.15.222, <2.6.22, 2.6.22, <=7.2.*, <8f510f68208a1f673d7c7234a687be4671490e9c, <b28a17d4a9bb0aa38b48681c3927b012ba40eabe, <82e47533221d4746947b74d2e79a478c36c6433a, <=*, <=5.15.*, 6.18.54, <4719424bb7cb9f20b73986bcb72dd528f0e5c6eb, <0191c9ff23ef1678dbfb5ad253a2dee92feb5d71, 7.3) 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/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71
- https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c
- https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb
- https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b
- https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe
- https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488
- https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d
- https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a