CVE-2021-47063: drm: bridge/panel: Cleanup connector on bridge detach
First published: Thu Feb 29 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm: bridge/panel: Cleanup connector on bridge detach If we don't call drm_connector_cleanup() manually in panel_bridge_detach(), the connector will be cleaned up with the other DRM objects in the call to drm_mode_config_cleanup(). However, since our drm_connector is devm-allocated, by the time drm_mode_config_cleanup() will be called, our connector will be long gone. Therefore, the connector must be cleaned up when the bridge is detached to avoid use-after-free conditions. v2: Cleanup connector only if it was created v3: Add FIXME v4: (Use connector->dev) directly in if() block
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.13<5.10.37 | |
| Linux Linux kernel | >=5.11<5.11.21 | |
| Linux Linux kernel | >=5.12<5.12.4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/18149b420c9bd93c443e8d1f48a063d71d9f6aa1
- https://git.kernel.org/stable/c/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0
- https://git.kernel.org/stable/c/98d7d76a74e48ec3ddf2e23950adff7edcab9327
- https://git.kernel.org/stable/c/ce450934a00cf896e648fde08d0bd1426653d7a2
- https://launchpad.net/bugs/cve/CVE-2021-47063
- https://git.kernel.org/linus/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0
- https://security-tracker.debian.org/tracker/CVE-2021-47063
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47063
- https://nvd.nist.gov/vuln/detail/CVE-2021-47063
- https://ubuntu.com/security/CVE-2021-47063
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