PT-2024-8987 · Linux+2 · Linux Kernel+2

Vincent Whitchurch · Published 2024-05-24 · Updated 2024-11-27 · CVE-2021-47561

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)

Description: The issue is related to the i2c virtio component in the Linux kernel. If a timeout occurs, it can result in incorrect data on the I2C bus and/or memory corruptions in the guest since the device can still be operating on the buffers it was given while the guest has freed them. This can lead to a denial of service. The virtio i2c xfer function is involved in the issue, and the problem can be triggered when a timeout is forced, for example, by setting a breakpoint in the backend. The estimated number of potentially affected devices worldwide is not available. There is no information about real-world incidents where this issue was exploited.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability. As a temporary workaround, consider disabling the timeout support for the i2c virtio component to minimize the risk of exploitation.

Use After Free

Buffer Overflow

Weakness Enumeration

CWE-416

CWE-119

Related Identifiers

BDU:2024-10669

CVE-2021-47561

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 15

• https://osv.dev/vulnerability/CVE-2021-47561 · Vendor Advisory
• https://git.kernel.org/stable/c/84e1d0bf1d7121759622dabf8fbef4c99ad597c5 · Patch
• https://cve.org/CVERecord?id=CVE-2021-47561 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47561 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47561 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47561 · Vendor Advisory
• https://git.kernel.org/stable/c/cc432b0727ce404cc13e8f6b5ce29f412c3f9f1f · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47561 · Security Note
• https://bdu.fstec.ru/vul/2024-10669 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47561 · Vendor Advisory
• https://redos.red-soft.ru/support/secure · Note
• https://git.kernel.org/linus/84e1d0bf1d7121759622dabf8fbef4c99ad597c5 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-kernel-lt-2711242 · Note
• https://access.redhat.com/security/cve/CVE-2021-47561 · Note
• https://lore.kernel.org/linux-cve-announce/2024052451-CVE-2021-47561-4a07@gregkh/T/#u · Note