CVE-2021-47172

iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers

State: Published
Severity: 5.5 Medium
Published: Mar 25, 2024
Updated: May 23, 2026
Reserved: Mar 25, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers

Channel numbering must start at 0 and then not have any holes, or it is possible to overflow the available storage. Note this bug was introduced as part of a fix to ensure we didn't rely on the ordering of child nodes. So we need to support arbitrary ordering but they all need to be there somewhere.

Note I hit this when using qemu to test the rest of this series. Arguably this isn't the best fix, but it is probably the most minimal option for backporting etc.

Alexandru's sign-off is here because he carried this patch in a larger set that Jonathan then applied.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Affected Products

Product	Versions
LinuxLinux	5408cbc6337300d6f1a87c797273c535ed96305a to before f49149964d2423fb618fb6b755bb1eaa431cca2cAffected d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before f70122825076117787b91e7f219e21c09f11a5b9Affected d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdcAffected d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before f2a772c51206b0c3f262e4f6a3812c89a650191bAffected 5.4.14 to before 5.4.124Affected
LinuxLinux	5.5Affected before 5.5Not affected 5.4.124 through 5.4.Not affected 5.10.42 through 5.10.Not affected 5.12.9 through 5.12.*Not affected 5.13 and laterNot affected

Product

Versions

LinuxLinux

5408cbc6337300d6f1a87c797273c535ed96305a to before f49149964d2423fb618fb6b755bb1eaa431cca2cAffected
d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before f70122825076117787b91e7f219e21c09f11a5b9Affected
d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before 26da8040eccc6c6b0e415e9a3baf72fd39eb2fdcAffected
d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 to before f2a772c51206b0c3f262e4f6a3812c89a650191bAffected
5.4.14 to before 5.4.124Affected

LinuxLinux

5.5Affected
before 5.5Not affected
5.4.124 through 5.4.*Not affected
5.10.42 through 5.10.*Not affected
5.12.9 through 5.12.*Not affected
5.13 and laterNot affected

References

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