CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
5.1%
In the Linux kernel, the following vulnerability has been resolved: net:
hso: fix null-ptr-deref during tty device unregistration Multiple ttys try
to claim the same the minor number causing a double unregistration of the
same device. The first unregistration succeeds but the next one results in
a null-ptr-deref. The get_free_serial_index() function returns an available
minor number but doesn’t assign it immediately. The assignment is done by
the caller later. But before this assignment, calls to
get_free_serial_index() would return the same minor number. Fix this by
modifying get_free_serial_index to assign the minor number immediately
after one is found to be and rename it to obtain_minor() to better reflect
what it does. Similary, rename set_serial_by_index() to release_minor() and
modify it to free up the minor number of the given hso_serial. Every
obtain_minor() should have corresponding release_minor() call.
Author | Note |
---|---|
rodrigo-zaiden | fix for this issue caused a regression, registered in CVE-2021-46905. maybe it could be just one CVE as the issue seems to remain the same. |
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws-hwe | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 14.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |