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gpiolib: cdev: Fix use after free in lineinfo_changed_notify

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

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
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Prerequisites
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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

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Event
#26585 · Revision 1
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