CVE-2023-52765
Vulnérabilité moyenne dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: mfd: qcom-spmi-pmic: Fix revid implementation The Qualcomm SPMI PMIC revid implementation is broken in multiple ways. First, it assumes that just because the sibling base device has been registered that means that it is also bound to a driver, which may not be the case (e.g. due to probe deferral or asynchronous probe). This could trigger a NULL-pointer dereference when attempting to access the driver data of the unbound device. Second, it accesses driver data of a sibling device directly and without any locking, which means that the driver data may be freed while it is being accessed (e.g. on driver unbind). Third, it leaks a struct device reference to the sibling device which is looked up using the spmi_device_from_of() every time a function (child) device is calling the revid function (e.g. on probe). Fix this mess by reimplementing the revid lookup so that it is done only at probe of the PMIC device; the base device fetches the revid info from the hardware, while any secondary SPMI device fetches the information from the base device and caches it so that it can be accessed safely from its children. If the base device has not been probed yet then probe of a secondary device is deferred.
Gravité et risque d'exploitation
CVE-2023-52765 obtient un score CVSS de 6.2/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 15.6 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <db98de0809f12b0edb9cd1be78e1ec1bfeba8f40, <=*, <=6.5.*, 6.6.3, <4ce77b023d42a9f1062eecf438df1af4b4072eb2, 6.1.64, e9c11c6e3a0e93903f5a13f8d2f97ae1bba512e1, <=6.6.*, 6.0, 0, 6.7, <7b439aaa62fee474a0d84d67a25f4984467e7b95, 6.5.13, <6.0, <affae18838db5e6b463ee30c821385695af56dc2) 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.