UBUNTU-CVE-2021-47063
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
02 / AFFECTED SOFTWARE
Affected packages
59 explicit affected versions
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43 explicit affected versions
44 explicit affected versions
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79 explicit affected versions
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68 explicit affected versions
1 explicit affected versions
43 explicit affected versions
50 explicit affected versions
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6 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/4d906839d321c2efbf3fed4bc31ffd9ff55b75c0
- https://ubuntu.com/security/CVE-2021-47063
- https://ubuntu.com/security/notices/USN-6831-1
- https://ubuntu.com/security/notices/USN-6866-1
- https://ubuntu.com/security/notices/USN-6866-2
- https://ubuntu.com/security/notices/USN-6866-3
- https://ubuntu.com/security/notices/USN-6867-1
- https://www.cve.org/CVERecord?id=CVE-2021-47063