CVE-2021-46945

ext4: always panic when errors=panic is specified

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: always panic when errors=panic is specified Before commit 014c9caa29d3 ("ext4: make ext4_abort() use __ext4_error()"), the following series of commands would trigger a panic: 1. mount /dev/sda -o ro,errors=panic test 2. mount /dev/sda -o remount,abort test After commit 014c9caa29d3, remounting a file system using the test mount option "abort" will no longer trigger a panic. This commit will restore the behaviour immediately before commit 014c9caa29d3. (However, note that the Linux kernel's behavior has not been consistent; some previous kernel versions, including 5.4 and 4.19 similarly did not panic after using the mount option "abort".) This also makes a change to long-standing behaviour; namely, the following series commands will now cause a panic, when previously it did not: 1. mount /dev/sda -o ro,errors=panic test 2. echo test > /sys/fs/ext4/sda/trigger_fs_error However, this makes ext4's behaviour much more consistent, so this is a good thing.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.01%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde	patch
https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4	patch
https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995	patch

Frequently Asked Questions

What is the severity of CVE-2021-46945?: CVE-2021-46945 has been scored as a medium severity vulnerability.
How to fix CVE-2021-46945?: To fix CVE-2021-46945, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-46945 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-46945 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-46945?: CVE-2021-46945 affects Linux Linux, Linux Linux.

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