Information disclosure in Linux kernel iommu driver

1) Information disclosure

EUVDB-ID: #VU91366

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47177

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to information disclosure within the alloc_iommu() function in drivers/iommu/dmar.c. A local user can gain access to sensitive information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/22da9f4978381a99f1abaeaf6c9b83be6ab5ddd8
https://git.kernel.org/stable/c/2ec5e9bb6b0560c90d315559c28a99723c80b996
https://git.kernel.org/stable/c/044bbe8b92ab4e542de7f6c93c88ea65cccd8e29
https://git.kernel.org/stable/c/f01134321d04f47c718bb41b799bcdeda27873d2
https://git.kernel.org/stable/c/ca466561eef36d1ec657673e3944eb6340bddb5b
https://git.kernel.org/stable/c/0ee74d5a48635c848c20f152d0d488bf84641304

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.