CVE-2024-44951
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.
Gravité et risque d'exploitation
CVE-2024-44951 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 0.18 %, ce qui la place devant 7.2 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions 6.11, 6.8, <=*, 6.1.76, <6.8, 6.7.3, <133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4, 6.10.5, 6.6.15, 4409df5866b7ff7686ba27e449ca97a92ee063c9, 9879e1bec3c0f077427dd0d258c80c63ce9babdf, <6.2, 0, 4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68, <=6.10.*, dbe196ca489f3833e0f9eeb86ac346194f131c91, <6.7, <09cfe05e9907f3276887a20e267cc40e202f4fdd) 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.