NULL Pointer Dereference Affecting kernel-debug-devel package, versions <0:4.18.0-553.22.1.el8_10
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGDEVEL-6981535
- published 22 May 2024
- disclosed 21 May 2024
Introduced: 21 May 2024
CVE-2021-47386 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug-devel to version 0:4.18.0-553.22.1.el8_10 or higher.
This issue was patched in RHSA-2024:7000.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel package and not the kernel-debug-devel package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field
If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients().
The patch fixes possible NULL pointer dereference by removing lm75[].
Found by Linux Driver Verification project (linuxtesting.org).
[groeck: Dropped unnecessary continuation lines, fixed multi-line alignment]
References
- https://access.redhat.com/security/cve/CVE-2021-47386
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4