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CVE-2021-46945
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CVE-2021-46945
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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:
- mount /dev/sda -o ro,errors=panic test
- 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:
- mount /dev/sda -o ro,errors=panic test
- echo test > /sys/fs/ext4/sda/trigger_fs_error
However, this makes ext4’s behaviour much more consistent, so this is
a good thing.
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General Information
Vendors
- linux
Products
- linux kernel
References
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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