vulnerability

Debian: CVE-2021-47276: linux -- security update

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:N/A:C)
Published
05/21/2024
Added
07/30/2024
Modified
02/19/2025

Description

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

ftrace: Do not blindly read the ip address in ftrace_bug()

It was reported that a bug on arm64 caused a bad ip address to be used for
updating into a nop in ftrace_init(), but the error path (rightfully)
returned -EINVAL and not -EFAULT, as the bug caused more than one error to
occur. But because -EINVAL was returned, the ftrace_bug() tried to report
what was at the location of the ip address, and read it directly. This
caused the machine to panic, as the ip was not pointing to a valid memory
address.

Instead, read the ip address with copy_from_kernel_nofault() to safely
access the memory, and if it faults, report that the address faulted,
otherwise report what was in that location.

Solution

debian-upgrade-linux
Title
NEW

Explore Exposure Command

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