Answer in brief
CVE-2021-47500 records a High severity (CVSS 7.8) vulnerability in iio: mma8452: Fix trigger reference couting. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ae6d9ce05691bf79694074db7c7da980080548af <094d513b78b1714113bc016684b8142382e071ba || >=ae6d9ce05691bf79694074db7c7da980080548af <fb75cc4740d81264cd5bcb0e17d961d018a8be96 || >=ae6d9ce05691bf79694074db7c7da980080548af <794c0898f6bf39a458655d5fb4af70ec43a5cfcb || >=ae6d9ce05691bf79694074db7c7da980080548af <f5deab10ced368c807866283f8b79144c4823be8 || >=ae6d9ce05691bf79694074db7c7da980080548af <acf0088ac073ca6e7f4cad6acac112177e08df5e || >=ae6d9ce05691bf79694074db7c7da980080548af <db12d95085367de8b0223929d1332731024441f1 || >=ae6d9ce05691bf79694074db7c7da980080548af <c43517071dfc9fce34f8f69dbb98a86017f6b739 || >=ae6d9ce05691bf79694074db7c7da980080548af <cd0082235783f814241a1c9483fb89e405f4f892 | 094d513b78b1714113bc016684b8142382e071ba, fb75cc4740d81264cd5bcb0e17d961d018a8be96, 794c0898f6bf39a458655d5fb4af70ec43a5cfcb, f5deab10ced368c807866283f8b79144c4823be8, acf0088ac073ca6e7f4cad6acac112177e08df5e, db12d95085367de8b0223929d1332731024441f1, c43517071dfc9fce34f8f69dbb98a86017f6b739, cd0082235783f814241a1c9483fb89e405f4f892 |
| Linux/Linuxgeneric | 4.2 | Not reported |
Published upstream
May 24, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.
Quoted source text, attributed separately from HOL analysis.