CVE-2024-50213 drm/tests: hdmi: Fix memory leaks in drm_display_mode_from_cea_vic()
A memory leak in the Linux kernel's DRM HDMI test module can lead to resource exhaustion and denial of service when the module is loaded and unloaded.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50213?
CVE-2024-50213 is a medium-severity denial of service vulnerability in Linux kernel, published on 9 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/tests: hdmi: Fix memory leaks in drm_display_mode_from_cea_vic()
modprobe drm_hdmi_state_helper_test and then rmmod it, the following memory leak occurs.
The `mode` allocated in drm_mode_duplicate() called by drm_display_mode_from_cea_vic() is not freed, which cause the memory leak:
unreferenced object 0xffffff80ccd18100 (size 128): comm "kunit_try_catch", pid 1851, jiffies 4295059695 hex dump (first 32 bytes): 57 62 00 00 80 02 90 02 f0 02 20 03 00 00 e0 01 Wb........ ..... ea 01 ec 01 0d 02 00 00 0a 00 00 00 00 00 00 00 ................ backtrace (crc c2f1aa95): [<000000000f10b11b>] kmemleak_alloc+0x34/0x40 [<000000001cd4cf73>] __kmalloc_cache_noprof+0x26c/0x2f4 [<00000000f1f3cffa>] drm_mode_duplicate+0x44/0x19c [<000000008cbeef13>] drm_display_mode_from_cea_vic+0x88/0x98 [<0000000019daaacf>] 0xffffffedc11ae69c [<000000000aad0f85>] kunit_try_run_case+0x13c/0x3ac [<00000000a9210bac>] kunit_generic_run_threadfn_adapter+0x80/0xec [<000000000a0b2e9e>] kthread+0x2e8/0x374 [<00000000bd668858>] ret_from_fork+0x10/0x20 ......
Free `mode` by using drm_kunit_display_mode_from_cea_vic() to fix it.
Weakness: CWE-401
Which versions are affected by CVE-2024-50213?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50213?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-50213 being exploited?
There is no known exploitation of CVE-2024-50213 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-50213, DEBIAN-CVE-2024-50213, GHSA-p299-525g-4h76, UBUNTU-CVE-2024-50213.