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high7.8

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 …

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 4.4.195 before 4.4.269
from 4.9.195 before 4.9.269
from 4.14.147 before 4.14.233
from 4.19.77 before 4.19.191
from 5.4 before 5.4.118
from 5.5 before 5.10.36

Weakness classification

CWE-416

References