Out-of-bounds read in Linux kernel display amdgpu_dm driver

1) Out-of-bounds read

EUVDB-ID: #VU91082

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47489

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the dp_phy_settings_write(), dp_phy_test_pattern_debugfs_write(), dp_dsc_passthrough_set(), trigger_hotplug(), dp_dsc_clock_en_write(), dp_dsc_slice_width_write(), dp_dsc_slice_height_write(), dp_dsc_bits_per_pixel_write() and dp_max_bpc_write() functions in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

http://git.kernel.org/stable/c/9eb4bdd554fc31a5ef6bf645a20ff21618ce45a9
http://git.kernel.org/stable/c/3f4e54bd312d3dafb59daf2b97ffa08abebe60f5

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.