5.5

CVE-2023-52811: scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool

Analyzed
AliasesUBUNTU-CVE-2023-52811DEBIAN-CVE-2023-52811
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2023-52811 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 13
RHSA-2024:10771RHSA-2024:4823RHSA-2024:4831RHSA-2024:5101RHSA-2024:5102RHSA-2024:6993

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu117 products
  • linuxAll versions (No fix recorded) | < 5.15.0-100.110
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1056.61
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < e1d1f79b1929dce470a5dc9281c574cd58e8c6c0 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 88984ec4792766df5a9de7a2ff2b5f281f94c7d4 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8 | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < 8bbe784c2ff28d56ca0c548aaf3e584edc77052d | ≥ 072b91f9c6510d0ec4a49d07dbc318760c7da7b3, < b39f2d10b86d0af353ea339e5815820026bca48f | 2.6.27
  • linux_kernel< 5.15.140 | ≥ 5.16, < 6.1.64 | ≥ 6.2, < 6.5.13 | ≥ 6.6, < 6.6.3
Debian1 product
  • linux< 6.1.64-1 | < 6.5.13-1

3 vendors · 120 products

References

9 links