PT-2021-8005 · Linux · Linux Kernel

Felix Fietkau · Published 2021-04-12 · Updated 2025-04-08 · CVE-2021-47064

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

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

Description The issue is related to the mt76 dma tx queue skb raw function in the Linux kernel's mt76 component. It involves a potential DMA mapping leak due to the buf being uninitialized, which could cause its skip unmap field to inherit a non-zero value from stack garbage. This may lead to DMA mappings for MCU command frames not being unmapped after completion, potentially allowing an attacker to gain unauthorized access to protected information.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Access of Uninitialized Pointer

Memory Leak

Weakness Enumeration

CWE-824

CWE-402

CWE-401

Related Identifiers

BDU:2024-01757

CVE-2021-47064

Affected Products

Linux Kernel

References · 24

• https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47064 · Security Note
• https://git.kernel.org/stable/c/9fa26701cd1fc4d932d431971efc5746325bdfce · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47064 · Vendor Advisory
• https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08 · Patch
• https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c · Patch
• https://osv.dev/vulnerability/CVE-2021-47064 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47064 · Security Note
• https://bdu.fstec.ru/vul/2024-01757 · Security Note
• https://ubuntu.com/security/CVE-2021-47064 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47064 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47064 · Vendor Advisory
• https://t.me/cvenotify/118238 · Telegram Post
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.37 · Note
• https://access.redhat.com/security/cve/cve-2021-47064 · Note