CVE-2021-47133 HID: amd_sfh: Fix memory leak in amd_sfh_work
A memory leak in the AMD SFH HID driver allows attackers to cause a denial of service by exhausting kernel memory.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47133?
CVE-2021-47133 is a medium-severity memory corruption vulnerability in Linux kernel, published on 15 Mar 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:
HID: amd_sfh: Fix memory leak in amd_sfh_work
Kmemleak tool detected a memory leak in the amd_sfh driver.
==================== unreferenced object 0xffff88810228ada0 (size 32): comm "insmod", pid 3968, jiffies 4295056001 (age 775.792s) hex dump (first 32 bytes): 00 20 73 1f 81 88 ff ff 00 01 00 00 00 00 ad de . s............. 22 01 00 00 00 00 ad de 01 00 02 00 00 00 00 00 "............... backtrace: [<000000007b4c8799>] kmem_cache_alloc_trace+0x163/0x4f0 [<0000000005326893>] amd_sfh_get_report+0xa4/0x1d0 [amd_sfh] [<000000002a9e5ec4>] amdtp_hid_request+0x62/0x80 [amd_sfh] [<00000000b8a95807>] sensor_hub_get_feature+0x145/0x270 [hid_sensor_hub] [<00000000fda054ee>] hid_sensor_parse_common_attributes+0x215/0x460 [hid_sensor_iio_common] [<0000000021279ecf>] hid_accel_3d_probe+0xff/0x4a0 [hid_sensor_accel_3d] [<00000000915760ce>] platform_probe+0x6a/0xd0 [<0000000060258a1f>] really_probe+0x192/0x620 [<00000000fa812f2d>] driver_probe_device+0x14a/0x1d0 [<000000005e79f7fd>] __device_attach_driver+0xbd/0x110 [<0000000070d15018>] bus_for_each_drv+0xfd/0x160 [<0000000013a3c312>] __device_attach+0x18b/0x220 [<000000008c7b4afc>] device_initial_probe+0x13/0x20 [<00000000e6e99665>] bus_probe_device+0xfe/0x120 [<00000000833fa90b>] device_add+0x6a6/0xe00 [<00000000fa901078>] platform_device_add+0x180/0x380 ====================
The fix is to freeing request_list entry once the processed entry is removed from the request_list.
Weakness: CWE-401
Which versions are affected by CVE-2021-47133?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47133?
No fix has been published for CVE-2021-47133 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-47133 being exploited?
There is no known exploitation of CVE-2021-47133 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as GHSA-r42v-97m8-w3j8, UBUNTU-CVE-2021-47133.