CVE-2023-53275

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync() The variable codec->regmap is often protected by the lock codec->regmap_lock when is accessed. However, it is accessed without holding the lock when is accessed in snd_hdac_regmap_sync(): if (codec->regmap) In my opinion, this may be a harmful race, because if codec->regmap is set to NULL right after the condition is checked, a null-pointer dereference can occur in the called function regcache_sync(): map->lock(map->lock_arg); --> Line 360 in drivers/base/regmap/regcache.c To fix this possible null-pointer dereference caused by data race, the mutex_lock coverage is extended to protect the if statement as well as the function call to regcache_sync(). [ Note: the lack of the regmap_lock itself is harmless for the current codec driver implementations, as snd_hdac_regmap_sync() is only for PM runtime resume that is prohibited during the codec probe. But the change makes the whole code more consistent, so it's merged as is -- tiwai ]

Gravité et risque d'exploitation

CVE-2023-53275 obtient un score CVSS de 5.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.16 %, ce qui la place devant 4.7 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <9f9eed451176ffcac6b5ba0f6dae1a6b4a1cb0eb, 69d5dc286d05441ca2f854ae8df11201f6f9b706, <1f4a08fed450db87fbb5ff5105354158bdbe1a22, 0, 6.4.12, <b32e40379e5b2814de0c4bc199edc2d82317dc07, <5.4.255, 5.4.43, 5.6, 6.5, <=5.10.*, <8703b26387e1fa4f8749db98d24c67617b873acb, <cdd412b528dee6e0851c4735d6676ec138da13a4, <=5.4.*, 5.10.192, 5.4.255, 5.15.128, 6.1.47, <109f0aaa0b8838a88af9125b79579023539300a7, <5.6, <=*, <=5.15.*, 1a462be52f4505a2719631fb5aa7bfdbd37bfd8d, <=6.4.*) 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/109f0aaa0b8838a88af9125b79579023539300a7
• https://git.kernel.org/stable/c/9f9eed451176ffcac6b5ba0f6dae1a6b4a1cb0eb
• https://git.kernel.org/stable/c/8703b26387e1fa4f8749db98d24c67617b873acb
• https://git.kernel.org/stable/c/cdd412b528dee6e0851c4735d6676ec138da13a4
• https://git.kernel.org/stable/c/b32e40379e5b2814de0c4bc199edc2d82317dc07
• https://git.kernel.org/stable/c/1f4a08fed450db87fbb5ff5105354158bdbe1a22