#VU91082 Out-of-bounds read in Linux kernel - CVE-2021-47489

Vulnerability identifier: #VU91082

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47489

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

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

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External links
https://git.kernel.org/stable/c/9eb4bdd554fc31a5ef6bf645a20ff21618ce45a9
https://git.kernel.org/stable/c/3f4e54bd312d3dafb59daf2b97ffa08abebe60f5

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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.