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nvd416baaa9-dc9f-4396-8d5f-8c081fb06d67NVD:CVE-2021-47153
HistoryMar 25, 2024 - 9:15 a.m.

CVE-2021-47153

2024-03-2509:15:09
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
1
linux kernel
i2c
vulnerability
interrupt
memory access

7.3 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%

In the Linux kernel, the following vulnerability has been resolved:

i2c: i801: Don’t generate an interrupt on bus reset

Now that the i2c-i801 driver supports interrupts, setting the KILL bit
in a attempt to recover from a timed out transaction triggers an
interrupt. Unfortunately, the interrupt handler (i801_isr) is not
prepared for this situation and will try to process the interrupt as
if it was signaling the end of a successful transaction. In the case
of a block transaction, this can result in an out-of-range memory
access.

This condition was reproduced several times by syzbot:
https://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e
https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e
https://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e
https://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb
https://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a
https://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79

So disable interrupts while trying to reset the bus. Interrupts will
be enabled again for the following transaction.

7.3 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%