# CVE-2022-20008: linux: In mmc_blk_read_single of block.c, there is a possible way to read kernel heap memory due to uninitialized data

CVE-2022-20008 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-20008, released May 10, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-20008
- Priority: Routine
- CVSS: 4.6 (medium)
- EPSS: 0.0038
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 10, 2022

## Description

In mmc_blk_read_single of block.c, there is a possible way to read kernel heap memory due to uninitialized data. This could lead to local information disclosure if reading from an SD card that triggers errors, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-216481035References: Upstream kernel

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.11-1 | [DEBIAN-CVE-2022-20008](https://patchblox.com/security/data/fix/linux/debian-cve-2022-20008.md) | May 10, 2022 |
| Linux | linux Debian 13.5 (trixie) | 5.16.11-1 | [DEBIAN-CVE-2022-20008](https://patchblox.com/security/data/fix/linux/debian-cve-2022-20008.md) | May 10, 2022 |
| Linux | linux Debian 14 | 5.16.11-1 | [DEBIAN-CVE-2022-20008](https://patchblox.com/security/data/fix/linux/debian-cve-2022-20008.md) | May 10, 2022 |

---

Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.