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ubuntucveUbuntu.comUB:CVE-2023-52811
HistoryMay 21, 2024 - 12:00 a.m.

CVE-2023-52811

2024-05-2100:00:00
ubuntu.com
ubuntu.com
12
linux kernel
vulnerability
resolution
scsi
driver
recovery
event pool
ibmvfc
bug fix
error handling
unix

AI Score

6.9

Confidence

High

EPSS

0

Percentile

15.5%

In the Linux kernel, the following vulnerability has been resolved: scsi:
ibmvfc: Remove BUG_ON in the case of an empty event pool In practice the
driver should never send more commands than are allocated to a queue’s
event pool. In the unlikely event that this happens, the code asserts a
BUG_ON, and in the case that the kernel is not configured to crash on panic
returns a junk event pointer from the empty event list causing things to
spiral from there. This BUG_ON is a historical artifact of the ibmvfc
driver first being upstreamed, and it is well known now that the use of
BUG_ON is bad practice except in the most unrecoverable scenario. There is
nothing about this scenario that prevents the driver from recovering and
carrying on. Remove the BUG_ON in question from ibmvfc_get_event() and
return a NULL pointer in the case of an empty event pool. Update all call
sites to ibmvfc_get_event() to check for a NULL pointer and perfrom the
appropriate failure or recovery action.

AI Score

6.9

Confidence

High

EPSS

0

Percentile

15.5%