Double free in Linux kernel - CVE-2021-46979
Published: June 3, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90899
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-46979
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a double free error within the EXPORT_SYMBOL() and iio_device_unregister() functions in drivers/iio/industrialio-core.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46979
Install update from vendor's website.
Linux kernel - addressed in versions 5.11.22, 5.12.5, 5.13
External References
- https://git.kernel.org/stable/c/11e1cae5da4096552f7c091476cbadbc0d1817da
- https://git.kernel.org/stable/c/ab6c935ba3a04317632f3b8b68675bdbaf395303
- https://git.kernel.org/stable/c/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.22
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13