CVE-2024-50001

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix error path in multi-packet WQE transmit Remove the erroneous unmap in case no DMA mapping was established The multi-packet WQE transmit code attempts to obtain a DMA mapping for the skb. This could fail, e.g. under memory pressure, when the IOMMU driver just can't allocate more memory for page tables. While the code tries to handle this in the path below the err_unmap label it erroneously unmaps one entry from the sq's FIFO list of active mappings. Since the current map attempt failed this unmap is removing some random DMA mapping that might still be required. If the PCI function now presents that IOVA, the IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI function in error state. The erroneous behavior was seen in a stress-test environment that created memory pressure.

Gravité et risque d'exploitation

CVE-2024-50001 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 0.33 %, ce qui la place devant 24.2 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions 6.12, <=6.1.*, <=6.11.*, <fc357e78176945ca7bcacf92ab794b9ccd41b4f4, 0, <ce828b347cf1b3c1b12b091d02463c35ce5097f5, <=5.10.*, <=6.6.*, <ecf310aaf256acbc8182189fe0aa1021c3ddef72, 6.6.55, <2bcae12c795f32ddfbf8c80d1b5f1d3286341c32, <8bb8c12fb5e2b1f03d603d493c92941676f109b5, 6.11.3, <5.10, 6.1.113, <26fad69b34fcba80d5c7d9e651f628e6ac927754, <=*, <ca36d6c1a49b6965c86dd528a73f38bc62d9c625, <=5.15.*, 5af75c747e2a868abbf8611494b50ed5e076fca7, 5.10.227, 6.10.14, 5.15.168, <=6.10.*, 5.10) 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/ca36d6c1a49b6965c86dd528a73f38bc62d9c625
• https://git.kernel.org/stable/c/ce828b347cf1b3c1b12b091d02463c35ce5097f5
• https://git.kernel.org/stable/c/fc357e78176945ca7bcacf92ab794b9ccd41b4f4
• https://git.kernel.org/stable/c/26fad69b34fcba80d5c7d9e651f628e6ac927754
• https://git.kernel.org/stable/c/ecf310aaf256acbc8182189fe0aa1021c3ddef72
• https://git.kernel.org/stable/c/8bb8c12fb5e2b1f03d603d493c92941676f109b5
• https://git.kernel.org/stable/c/2bcae12c795f32ddfbf8c80d1b5f1d3286341c32