PT-2024-11088 · Linux · Linux Kernel

Tomasz Duszynski · Published 2021-05-10 · Updated 2024-12-31 · CVE-2021-46979

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description The issue is related to the removal of ioctl handlers in the Linux kernel. Currently, ioctl handlers are removed twice, which leads to a double free and results in a kernel panic. This occurs during the iio device unregister() function and later on inside iio device unregister eventset() and iio buffers free sysfs and mask(). The fix involves not touching the ioctl handlers list directly but rather letting the code responsible for registration call the matching cleanup routine itself.

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

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

BDU:2025-05302

CVE-2021-46979

Affected Products

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/11e1cae5da4096552f7c091476cbadbc0d1817da · Patch
• https://git.kernel.org/stable/c/ab6c935ba3a04317632f3b8b68675bdbaf395303 · Patch
• https://cve.org/CVERecord?id=CVE-2021-46979 · Security Note
• https://git.kernel.org/stable/c/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-46979 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-46979 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-46979 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-05302 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-46979 · Security Note
• https://lore.kernel.org/linux-cve-announce/2024022823-CVE-2021-46979-de90@gregkh · Note
• https://git.kernel.org/linus/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a · Note
• https://lore.kernel.org/linux-cve-announce/2024022823-CVE-2021-46979-de90@gregkh/T/#u · Note
• https://t.me/cvenotify/105844 · Telegram Post
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.5 · Note
• https://twitter.com/CVEnew/status/1762754446617182597 · Twitter Post