CVE-2021-0707: Use-after-free in dmabuffs_dname
Summary
CVE-2021-0707: In dma_buf_release of dma-buf.c, there is a possible memory corruption due to a use after free. Affects :linux_kernel: versions >= :0, < :2022-04-05. Fixed in :2022-04-05. How to fix ↓
Also tracked for
- linux · Debian:11
The same CVE-2021-0707 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The package under scrutiny is the Linux Kernel, specifically the Android ecosystem. The Linux Kernel is the core component of the Android operating system, responsible for managing system resources and providing essential functionality. The vulnerability in question, identified as CVE-2021-0707, affects the dmabuffs_dname function in dma-buf.c. This function is responsible for releasing a DMA buffer, which is a mechanism for sharing memory between different devices or subsystems. The vulnerability arises from a use-after-free issue in the dma_buf_release function, leading to potential memory corruption. Exploitation of this vulnerability could result in local escalation of privilege, without requiring any additional execution privileges or user interaction.
Vulnerability Detail
The vulnerability, CVE-2021-0707, is a use-after-free issue in the dmabuffs_dname function of the Linux Kernel's dma-buf.c file. When a DMA buffer is released, the dma_buf_release function is called. However, due to a programming error, there is a possibility of memory corruption occurring after the buffer has been freed. This can lead to a local escalation of privilege, allowing an attacker to gain elevated privileges on the affected system. The vulnerability does not require any additional execution privileges or user interaction for exploitation.
How To Fix
Minimum fixed version
:2022-04-05
This is the first release that contains the fix.
Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to a patched version.
Conclusion
In conclusion, the CVE-2021-0707 vulnerability in the Linux Kernel's dmabuffs_dname function poses a risk of local privilege escalation. To mitigate this vulnerability, it is crucial to update the Linux Kernel to a version that includes the necessary patch. No known workarounds exist for this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for :linux_kernel: →
FAQ
A use-after-free vulnerability occurs when a program continues to use a memory region after it has been freed. This can lead to memory corruption and potentially allow an attacker to execute arbitrary code or gain elevated privileges.
The impact of this vulnerability is a local escalation of privilege. An attacker who successfully exploits this vulnerability could gain elevated privileges on the affected system, potentially allowing them to perform unauthorized actions or access sensitive information.
No, user interaction is not required for exploitation of this vulnerability. An attacker can exploit the vulnerability without any user interaction.
The known mitigation for this vulnerability is to update the Linux Kernel to a version that includes the fix. Applying the patch will eliminate the use-after-free issue and prevent the memory corruption that can lead to privilege escalation.
More information about the fix for this vulnerability can be found in the Android Open Source Project (AOSP) repository. The fix was implemented in the Linux Kernel version released on April 5, 2022.
Related vulnerabilities
Recent vulnerabilities recorded for :linux_kernel:.
