CVE-2023-52811

published 2024-05-21

CVE-2023-52811: 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…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.64-1 (bookworm)	linux 6.1.64-1 (bookworm)
linux	linux	—	—
linux	linux	>= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < e1d1f79b1929dce470a5dc9281c574cd58e8c6c0	e1d1f79b1929dce470a5dc9281c574cd58e8c6c0
linux	linux	>= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 88984ec4792766df5a9de7a2ff2b5f281f94c7d4	88984ec4792766df5a9de7a2ff2b5f281f94c7d4
linux	linux	>= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8	d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8
linux	linux	>= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 8bbe784c2ff28d56ca0c548aaf3e584edc77052d	8bbe784c2ff28d56ca0c548aaf3e584edc77052d
linux	linux	>= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < b39f2d10b86d0af353ea339e5815820026bca48f	b39f2d10b86d0af353ea339e5815820026bca48f
linux	linux_kernel	< 5.15.140	5.15.140
linux	linux_kernel	>= 0 < 6.1.64-1	6.1.64-1
linux	linux_kernel	>= 0 < 6.5.13-1	6.5.13-1
linux	linux_kernel	>= 0 < 6.5.13-1	6.5.13-1
linux	linux_kernel	>= 5.16 < 6.1.64	6.1.64
linux	linux_kernel	>= 6.2 < 6.5.13	6.5.13
linux	linux_kernel	>= 6.6 < 6.6.3	6.6.3

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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