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gpiolib: cdev: Fix use after free in lineinfo_changed_notify (Linux Linux)

CVE-2024-36899
HIGH 7.0

At a glance

Source
NVD
EPSS
EPSS 0.18 % · percentile 7 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

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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.

Weaknesses (CWE)

  • CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-416 — Use After Free

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 51c1064e82e77b39a49889287ca50709303e2f26 < 2dfbb920a89bdc58087672ad5325dc6c588b6860 ; affected 51c1064e82e77b39a49889287ca50709303e2f26 < 2d008d4961b039d2edce8976289773961b7e5fb5 ; affected 51c1064e82e77b39a49889287ca50709303e2f26 < d38c49f7bdf14381270736299e2ff68ec248a017 ; affected 51c1064e82e77b39a49889287ca50709303e2f26 < 95ca7c90eaf5ea8a8460536535101e3e81160e2a ; affected 51c1064e82e77b39a49889287ca50709303e2f26 < ca710b5f40b8b16fdcad50bebd47f50e4c62d239 ; affected 51c1064e82e77b39a49889287ca50709303e2f26 < 02f6b0e1ec7e0e7d059dddc893645816552039da
Linux · Linuxaffected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.234 ≤ 5.10.* ; unaffected 5.15.177 ≤ 5.15.* ; unaffected 6.1.127 ≤ 6.1.* ; unaffected 6.6.31 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD