CVE-2023-52488

Description

In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: convert from _raw_ to _noinc_ regmap functions for FIFO The SC16IS7XX IC supports a burst mode to access the FIFOs where the initial register address is sent ($00), followed by all the FIFO data without having to resend the register address each time. In this mode, the IC doesn't increment the register address for each R/W byte. The regmap_raw_read() and regmap_raw_write() are functions which can perform IO over multiple registers. They are currently used to read/write from/to the FIFO, and although they operate correctly in this burst mode on the SPI bus, they would corrupt the regmap cache if it was not disabled manually. The reason is that when the R/W size is more than 1 byte, these functions assume that the register address is incremented and handle the cache accordingly. Convert FIFO R/W functions to use the regmap _noinc_ versions in order to remove the manual cache control which was a workaround when using the _raw_ versions. FIFO registers are properly declared as volatile so cache will not be used/updated for FIFO accesses.

Gravité et risque d'exploitation

CVE-2023-52488 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 0.29 %, ce qui la place devant 20.2 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 6.6.15, <dbf4ab821804df071c8b566d9813083125e6d97b, dfeae619d781dee61666d5551b93ba3be755a86b, 0, 5.15.154, 6.8, 6.7.3, <e635f652696ef6f1230621cfd89c350cb5ec6169, <=5.10.*, <=6.6.*, 5.10.215, <4e37416e4ee1b1bc17364a68973e0c63be89e611, <aa7cb4787698add9367b19f7afc667662c9bdb23, <416b10d2817c94db86829fb92ad43ce7d002c573, <=*, 6.1.76, <=5.15.*, <=6.7.*, <084c24e788d9cf29c55564de368bf5284f2bb5db, 3.16, <3.16) 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/4e37416e4ee1b1bc17364a68973e0c63be89e611
• https://git.kernel.org/stable/c/e635f652696ef6f1230621cfd89c350cb5ec6169
• https://git.kernel.org/stable/c/416b10d2817c94db86829fb92ad43ce7d002c573
• https://git.kernel.org/stable/c/084c24e788d9cf29c55564de368bf5284f2bb5db
• https://git.kernel.org/stable/c/aa7cb4787698add9367b19f7afc667662c9bdb23
• https://git.kernel.org/stable/c/dbf4ab821804df071c8b566d9813083125e6d97b