CVE-2023-52811

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < e1d1f79b1929dce470a5dc9281c574cd58e8c6c0affected
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 88984ec4792766df5a9de7a2ff2b5f281f94c7d4affected
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8affected
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 8bbe784c2ff28d56ca0c548aaf3e584edc77052daffected
LinuxLinux072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < b39f2d10b86d0af353ea339e5815820026bca48faffected
LinuxLinux2.6.27affected
LinuxLinux0 < 2.6.27unaffected
LinuxLinux5.15.140 <= 5.15.*unaffected
LinuxLinux6.1.64 <= 6.1.*unaffected
LinuxLinux6.5.13 <= 6.5.*unaffected
LinuxLinux6.6.3 <= 6.6.*unaffected
LinuxLinux6.7 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References