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redhatcveRedhat.comRH:CVE-2021-47276
HistoryMay 23, 2024 - 1:30 p.m.

CVE-2021-47276

2024-05-2313:30:16
redhat.com
access.redhat.com
1
linux kernel
vulnerability
ftrace
ip address
arm64
bug
memory address

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

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.

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%