Vulnerability Details : CVE-2021-47108
In the Linux kernel, the following vulnerability has been resolved:
drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf
In commit 41ca9caaae0b
("drm/mediatek: hdmi: Add check for CEA modes only") a check
for CEA modes was added to function mtk_hdmi_bridge_mode_valid()
in order to address possible issues on MT8167;
moreover, with commit c91026a938c2
("drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock")
another similar check was introduced.
Unfortunately though, at the time of writing, MT8173 does not provide
any mtk_hdmi_conf structure and this is crashing the kernel with NULL
pointer upon entering mtk_hdmi_bridge_mode_valid(), which happens as
soon as a HDMI cable gets plugged in.
To fix this regression, add a NULL pointer check for hdmi->conf in the
said function, restoring HDMI functionality and avoiding NULL pointer
kernel panics.
Products affected by CVE-2021-47108
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc6:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-47108
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 7 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-47108
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST | 2025-01-07 |
CWE ids for CVE-2021-47108
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-47108
-
https://git.kernel.org/stable/c/71d07ebc5000b9c1d140e99e7493b0bafa954776
drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/3b8e19a0aa3933a785be9f1541afd8d398c4ec69
drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf - kernel/git/stable/linux.git - Linux kernel stable treePatch
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