# CVE-2021-47202: linux: In the Linux kernel, the following vulnerability has been resolved:  thermal: Fix NULL pointer dereferences in of_the...

CVE-2021-47202 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47202, released April 10, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47202
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  thermal: Fix NULL pointer dereferences in of_thermal_ functions  of_parse_thermal_zones() parses the thermal-zones node and registers a thermal_zone device for each subnode. However, if a thermal zone is consuming a thermal sensor and that thermal sensor device hasn't probed yet, an attempt to set trip_point_*_temp for that thermal zone device can cause a NULL pointer dereference. Fix it.   console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp  ...  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020  ...  Call trace:   of_thermal_set_trip_temp+0x40/0xc4   trip_point_temp_store+0xc0/0x1dc   dev_attr_store+0x38/0x88   sysfs_kf_write+0x64/0xc0   kernfs_fop_write_iter+0x108/0x1d0   vfs_write+0x2f4/0x368   ksys_write+0x7c/0xec   __arm64_sys_write+0x20/0x30   el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc   do_el0_svc+0x28/0xa0   el0_svc+0x14/0x24   el0_sync_handler+0x88/0xec   el0_sync+0x1c0/0x200  While at it, fix the possible NULL pointer dereference in other functions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(), of_thermal_get_trend().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.5-1 | [DEBIAN-CVE-2021-47202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47202.md) | Apr 10, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.5-1 | [DEBIAN-CVE-2021-47202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47202.md) | Apr 10, 2024 |
| Linux | linux Debian 14 | 5.15.5-1 | [DEBIAN-CVE-2021-47202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47202.md) | Apr 10, 2024 |

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