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prionPRIOn knowledge basePRION:CVE-2021-46904
HistoryFeb 26, 2024 - 4:27 p.m.

Spoofing

2024-02-2616:27:00
PRIOn knowledge base
www.prio-n.com
10
linux kernel
vulnerability
network driver
null-ptr-deref
minor number
obtain_minor
release_minor

7.1 High

AI Score

Confidence

Low

0.0004 Low

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.

7.1 High

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%