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CVE-2021-46979

iio: core: fix ioctl handlers removal

MEDIUM
5.5
CVSS Score
Published: February 28, 2024 at 08:13 AM UTC
Updated: June 17, 2026 at 04:16 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: iio: core: fix ioctl handlers removal Currently ioctl handlers are removed twice. For the first time during iio_device_unregister() then later on inside iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask(). Double free leads to kernel panic. Fix this by not touching ioctl handlers list directly but rather letting code responsible for registration call the matching cleanup routine itself.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.11 ≤ v < 5.11.225.11 ≤ v < 5.12.55.11 ≤ v < 5.135.12 ≤ v < 5.12.55.13 rc18dedcc3eee3aceb37832176f0a1b03d5687acda3
Vendor states this is fixed in 11e1cae5da4096552f7c091476cbadbc0d1817da (fixed)
Vendor states this is fixed in 901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a (fixed)
Vendor states this is fixed in ab6c935ba3a04317632f3b8b68675bdbaf395303 (fixed)
Vendor states this is fixed in 5.11 (unaffected)
Vendor states this is fixed in 5.11.22 (unaffected)
Vendor states this is fixed in 5.12.5 (unaffected)
Vendor states this is fixed in 5.13 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/11e1cae5da4096552f7c091476cbadbc0d1817da
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/ab6c935ba3a04317632f3b8b68675bdbaf395303

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-415

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