CVE-2021-47500iio: mma8452: Fix trigger reference couting
- 7.8HighCVSS base score
- 0.24%Exploitation in 30 daysEPSS · top 84% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 2 days later
· 2 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 84% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected ae6d9ce05691bf79694074db7c7da980080548af – < 094d513b78b1714113bc016684b8142382e071ba
- affected ae6d9ce05691bf79694074db7c7da980080548af – < fb75cc4740d81264cd5bcb0e17d961d018a8be96
- affected ae6d9ce05691bf79694074db7c7da980080548af – < 794c0898f6bf39a458655d5fb4af70ec43a5cfcb
- affected ae6d9ce05691bf79694074db7c7da980080548af – < f5deab10ced368c807866283f8b79144c4823be8
- affected ae6d9ce05691bf79694074db7c7da980080548af – < acf0088ac073ca6e7f4cad6acac112177e08df5e
- affected ae6d9ce05691bf79694074db7c7da980080548af – < db12d95085367de8b0223929d1332731024441f1
- affected ae6d9ce05691bf79694074db7c7da980080548af – < c43517071dfc9fce34f8f69dbb98a86017f6b739
- affected ae6d9ce05691bf79694074db7c7da980080548af – < cd0082235783f814241a1c9483fb89e405f4f892
- affected 4.2
- unaffected < 4.2
- unaffected 4.4.295 – ≤ 4.4.*
- unaffected 4.9.293 – ≤ 4.9.*
- unaffected 4.14.258 – ≤ 4.14.*
- unaffected 4.19.221 – ≤ 4.19.*
- unaffected 5.4.165 – ≤ 5.4.*
- unaffected 5.10.85 – ≤ 5.10.*
- unaffected 5.15.8 – ≤ 5.15.*
- unaffected 5.16 – ≤ *
References
References8
- https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34504 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47500)Record last updated .