gpiolib: cdev: Fix use after free in lineinfo_changed_notify
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 unr
CVE-2024-36899
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-36899
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "2dfbb920a89bdc58087672ad5325dc6c588b6860",
"versionType": "git"
},
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "2d008d4961b039d2edce8976289773961b7e5fb5",
"versionType": "git"
},
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "d38c49f7bdf14381270736299e2ff68ec248a017",
"versionType": "git"
},
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "95ca7c90eaf5ea8a8460536535101e3e81160e2a",
"versionType": "git"
},
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "ca710b5f40b8b16fdcad50bebd47f50e4c62d239",
"versionType": "git"
},
{
"status": "affected",
"version": "51c1064e82e77b39a49889287ca50709303e2f26",
"lessThan": "02f6b0e1ec7e0e7d059dddc893645816552039da",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpio/gpiolib-cdev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.234",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.177",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.127",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.31",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.8.10",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpio/gpiolib-cdev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-36899
Source reference:
/cveMetadata/cveId
Publisher severity
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- Event
- #26585 · Revision 1
- Added to Heist Feed
- Publisher date