Linux Kernel up to 5.12.9 amd_sfh memory leak

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.12.9. Affected is an unknown function of the component amd_sfh. Performing a manipulation results in memory leak. This vulnerability is known as CVE-2021-47133. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 5.12.9. This affects some unknown processing of the component amd_sfh. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. The summary by CVE is:

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: [] kmem_cache_alloc_trace+0x163/0x4f0 [] amd_sfh_get_report+0xa4/0x1d0 [amd_sfh] [] amdtp_hid_request+0x62/0x80 [amd_sfh] [] sensor_hub_get_feature+0x145/0x270 [hid_sensor_hub] [] hid_sensor_parse_common_attributes+0x215/0x460 [hid_sensor_iio_common] [] hid_accel_3d_probe+0xff/0x4a0 [hid_sensor_accel_3d] [] platform_probe+0x6a/0xd0 [] really_probe+0x192/0x620 [] driver_probe_device+0x14a/0x1d0 [] __device_attach_driver+0xbd/0x110 [] bus_for_each_drv+0xfd/0x160 [] __device_attach+0x18b/0x220 [] device_initial_probe+0x13/0x20 [] bus_probe_device+0xfe/0x120 [] device_add+0x6a6/0xe00 [] platform_device_add+0x180/0x380 ==================== The fix is to freeing request_list entry once the processed entry is removed from the request_list.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2021-47133 since 03/04/2024. The exploitability is told to be difficult. Neither technical details nor an exploit are publicly available.

Upgrading to version 5.12.10 or 5.13 eliminates this vulnerability. Applying the patch 29beadea66a2/5ad755fd2b32 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7
• 5.12.8
• 5.12.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion