gpiolib: cdev: Fix use after free in lineinfo_changed_notify

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-36899
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-05-30 16:15:13 UTC
Updated2026-05-12 12:16:49 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-362 | CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 2dfbb920a89bdc58087672ad5325dc6c588b6860 git Not specified
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 2d008d4961b039d2edce8976289773961b7e5fb5 git Not specified
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 d38c49f7bdf14381270736299e2ff68ec248a017 git Not specified
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 95ca7c90eaf5ea8a8460536535101e3e81160e2a git Not specified
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 ca710b5f40b8b16fdcad50bebd47f50e4c62d239 git Not specified
CNA Linux Linux affected 51c1064e82e77b39a49889287ca50709303e2f26 02f6b0e1ec7e0e7d059dddc893645816552039da git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.234 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.177 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.127 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.31 6.6.* semver Not specified
CNA Linux Linux unaffected 6.8.10 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/03/msg00002.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/ca710b5f40b8b16fdcad50bebd47f50e4c62d239 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/02f6b0e1ec7e0e7d059dddc893645816552039da af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/2d008d4961b039d2edce8976289773961b7e5fb5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d38c49f7bdf14381270736299e2ff68ec248a017 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dfbb920a89bdc58087672ad5325dc6c588b6860 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
lists.debian.org/debian-lts-announce/2025/03/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/95ca7c90eaf5ea8a8460536535101e3e81160e2a af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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