7.8

CVE-2021-46966

In the Linux kernel, the following vulnerability has been resolved:

ACPI: custom_method: fix potential use-after-free issue

In cm_write(), buf is always freed when reaching the end of the
function.  If the requested count is less than table.length, the
allocated buffer will be freed but subsequent calls to cm_write() will
still try to access it.

Remove the unconditional kfree(buf) at the end of the function and
set the buf to NULL in the -EINVAL error path to match the rest of
function.
Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.4.195 < 4.4.269
Linux ≫ Linux Kernel Version >= 4.9.195 < 4.9.269
Linux ≫ Linux Kernel Version >= 4.14.147 < 4.14.233
Linux ≫ Linux Kernel Version >= 4.19.77 < 4.19.191
Linux ≫ Linux Kernel Version >= 5.4 < 5.4.118
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.36
Linux ≫ Linux Kernel Version >= 5.11 < 5.11.20
Linux ≫ Linux Kernel Version >= 5.12 < 5.12.3
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.02% 0.019
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.