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CVE-2024-36899

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 6.9, <=6.1.*, <95ca7c90eaf5ea8a8460536535101e3e81160e2a, <ca710b5f40b8b16fdcad50bebd47f50e4c62d239, 0, 5.10.234, 6.8.10, <d38c49f7bdf14381270736299e2ff68ec248a017, <5.7, <=5.10.*, <=6.6.*, 6.1.127, <2dfbb920a89bdc58087672ad5325dc6c588b6860, 51c1064e82e77b39a49889287ca50709303e2f26, 5.15.177, <2d008d4961b039d2edce8976289773961b7e5fb5, <=6.8.*, 6.6.31, 5.7, <=*, <=5.15.*, <02f6b0e1ec7e0e7d059dddc893645816552039da

Description

In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: Fix use after free in lineinfo_changed_notify The use-after-free issue occurs as follows: when the GPIO chip device file is being closed by invoking gpio_chrdev_release(), watched_lines is freed by bitmap_free(), but the unregistration of lineinfo_changed_nb notifier chain failed due to waiting write rwsem. Additionally, one of the GPIO chip's lines is also in the release process and holds the notifier chain's read rwsem. Consequently, a race condition leads to the use-after-free of watched_lines. Here is the typical stack when issue happened: [free] gpio_chrdev_release() --> bitmap_free(cdev->watched_lines) <-- freed --> blocking_notifier_chain_unregister() --> down_write(&nh->rwsem) <-- waiting rwsem --> __down_write_common() --> rwsem_down_write_slowpath() --> schedule_preempt_disabled() --> schedule() [use] st54spi_gpio_dev_release() --> gpio_free() --> gpiod_free() --> gpiod_free_commit() --> gpiod_line_state_notify() --> blocking_notifier_call_chain() --> down_read(&nh->rwsem); <-- held rwsem --> notifier_call_chain() --> lineinfo_changed_notify() --> test_bit(xxxx, cdev->watched_lines) <-- use after free The side effect of the use-after-free issue is that a GPIO line event is being generated for userspace where it shouldn't. However, since the chrdev is being closed, userspace won't have the chance to read that event anyway. To fix the issue, call the bitmap_free() function after the unregistration of lineinfo_changed_nb notifier chain.

Gravité et risque d'exploitation

CVE-2024-36899 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 0.18 %, ce qui la place devant 6.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.9, <=6.1.*, <95ca7c90eaf5ea8a8460536535101e3e81160e2a, <ca710b5f40b8b16fdcad50bebd47f50e4c62d239, 0, 5.10.234, 6.8.10, <d38c49f7bdf14381270736299e2ff68ec248a017, <5.7, <=5.10.*, <=6.6.*, 6.1.127, <2dfbb920a89bdc58087672ad5325dc6c588b6860, 51c1064e82e77b39a49889287ca50709303e2f26, 5.15.177, <2d008d4961b039d2edce8976289773961b7e5fb5, <=6.8.*, 6.6.31, 5.7, <=*, <=5.15.*, <02f6b0e1ec7e0e7d059dddc893645816552039da) 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

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