CVE-2024-46850: drm/amd/display: Avoid race between dcn35_set_drr() and dc_state_destruct()
First published: Fri Sep 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid race between dcn35_set_drr() and dc_state_destruct() dc_state_destruct() nulls the resource context of the DC state. The pipe context passed to dcn35_set_drr() is a member of this resource context. If dc_state_destruct() is called parallel to the IRQ processing (which calls dcn35_set_drr() at some point), we can end up using already nulled function callback fields of struct stream_resource. The logic in dcn35_set_drr() already tries to avoid this, by checking tg against NULL. But if the nulling happens exactly after the NULL check and before the next access, then we get a race. Avoid this by copying tg first to a local variable, and then use this variable for all the operations. This should work, as long as nobody frees the resource pool where the timing generators live. (cherry picked from commit 0607a50c004798a96e62c089a4c34c220179dcb5)
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.7<6.10.11 | |
| Linux Kernel | =6.11-rc1 | |
| Linux Kernel | =6.11-rc2 | |
| Linux Kernel | =6.11-rc3 | |
| Linux Kernel | =6.11-rc4 | |
| Linux Kernel | =6.11-rc5 | |
| Linux Kernel | =6.11-rc6 | |
| Linux Kernel | =6.11-rc7 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/42850927656a540428e58d370b3c1599a617bac7
- https://git.kernel.org/stable/c/e835d5144f5ef78e4f8828c63e2f0d61144f283a
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46850
- https://nvd.nist.gov/vuln/detail/CVE-2024-46850
- https://launchpad.net/bugs/cve/CVE-2024-46850
- https://security-tracker.debian.org/tracker/CVE-2024-46850
- https://ubuntu.com/security/CVE-2024-46850
- https://git.kernel.org/linus/e835d5144f5ef78e4f8828c63e2f0d61144f283a
Frequently Asked Questions
What is the severity of CVE-2024-46850?
CVE-2024-46850 is classified as a medium-severity vulnerability in the Linux kernel.
How do I fix CVE-2024-46850?
To fix CVE-2024-46850, update your Linux kernel to a patched version, specifically 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.11-1, or 6.12.12-1.
What versions of the Linux kernel are affected by CVE-2024-46850?
CVE-2024-46850 affects Linux kernel versions from 6.7 to 6.10.11, and the release candidates from 6.11-rc1 to 6.11-rc7.
What components are involved in CVE-2024-46850?
CVE-2024-46850 involves the DRM (Direct Rendering Manager) in the AMD display subsystem of the Linux kernel.
Is CVE-2024-46850 a user-exploitable vulnerability?
CVE-2024-46850 could potentially be exploited under certain conditions, affecting the stability of the display system.
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