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7.8
HIGH CVSS 3.1
CVE-2026-72042
ipmi: Fix user refcount underflow in event delivery
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix user refcount underflow in event delivery ipmi_alloc_recv_msg(user) takes the temporary user reference owned by the receive message, and ipmi_free_recv_msg() drops it again. If event delivery fails after allocating receive messages for earlier users, handle_read_event_rsp() rolls those messages back with ipmi_free_recv_msg(). That rollback path still drops user->refcount explicitly after freeing each message. The extra put can free a user that remains linked on intf->users, so later event delivery may dereference a freed user or trip refcount_t's addition-on-zero warning when ipmi_alloc_recv_msg() tries to acquire another reference. Remove the stale explicit put and the now-dead user assignment. Keep the list_del() and ipmi_free_recv_msg() calls; they are the required rollback operations.

Details
INFO

Published Date :

Aug. 15, 2026, 6:21 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72042 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Address refcount underflow in IPMI event delivery by removing extra put.
  • Remove stale explicit put in rollback path.
  • Remove dead user assignment.
  • Keep list_del and ipmi_free_recv_msg calls.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72042.

URL Resource
https://git.kernel.org/stable/c/6aa9e61c46465d231e9beddf56af7effd71be682
https://git.kernel.org/stable/c/7be349d4fcc5e065295b83418a22d27a68afbdb6
https://git.kernel.org/stable/c/ddbb6e3dc9bb4743de686aa1598c31e745cee76b
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72042 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72042 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72042 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72042 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': 'ddbb6e3dc9bb4743de686aa1598c31e745cee76b', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '7be349d4fcc5e065295b83418a22d27a68afbdb6', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '6aa9e61c46465d231e9beddf56af7effd71be682', 'versionType': 'git'}, {'status': 'affected', 'version': 'f63723ca7d7623f9dae1990973cd158671f03c56', 'versionType': 'git'}, {'status': 'affected', 'version': '348121b29594d42d1635648fd3ed31dfa25351d5', 'versionType': 'git'}, {'status': 'affected', 'version': '53d6e403affbf6df2c859a0ea00ccfc1e72090ca', 'versionType': 'git'}, {'status': 'affected', 'version': '0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.157', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.113', 'lessThan': '6.7', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.54', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.4', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': 'ddbb6e3dc9bb4743de686aa1598c31e745cee76b', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '7be349d4fcc5e065295b83418a22d27a68afbdb6', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '6aa9e61c46465d231e9beddf56af7effd71be682', 'versionType': 'git'}, {'status': 'affected', 'version': 'f63723ca7d7623f9dae1990973cd158671f03c56', 'versionType': 'git'}, {'status': 'affected', 'version': '348121b29594d42d1635648fd3ed31dfa25351d5', 'versionType': 'git'}, {'status': 'affected', 'version': '53d6e403affbf6df2c859a0ea00ccfc1e72090ca', 'versionType': 'git'}, {'status': 'affected', 'version': '0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.157', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.113', 'lessThan': '6.7', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.54', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.4', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': 'ddbb6e3dc9bb4743de686aa1598c31e745cee76b', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '7be349d4fcc5e065295b83418a22d27a68afbdb6', 'versionType': 'git'}, {'status': 'affected', 'version': 'b52da4054ee0bf9ecb44996f2c83236ff50b3812', 'lessThan': '6aa9e61c46465d231e9beddf56af7effd71be682', 'versionType': 'git'}, {'status': 'affected', 'version': 'f63723ca7d7623f9dae1990973cd158671f03c56', 'versionType': 'git'}, {'status': 'affected', 'version': '348121b29594d42d1635648fd3ed31dfa25351d5', 'versionType': 'git'}, {'status': 'affected', 'version': '53d6e403affbf6df2c859a0ea00ccfc1e72090ca', 'versionType': 'git'}, {'status': 'affected', 'version': '0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.157', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.113', 'lessThan': '6.7', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.54', 'lessThan': '6.13', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.17.4', 'lessThan': '6.18', 'versionType': 'semver'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.18'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.18', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/char/ipmi/ipmi_msghandler.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix user refcount underflow in event delivery ipmi_alloc_recv_msg(user) takes the temporary user reference owned by the receive message, and ipmi_free_recv_msg() drops it again. If event delivery fails after allocating receive messages for earlier users, handle_read_event_rsp() rolls those messages back with ipmi_free_recv_msg(). That rollback path still drops user->refcount explicitly after freeing each message. The extra put can free a user that remains linked on intf->users, so later event delivery may dereference a freed user or trip refcount_t's addition-on-zero warning when ipmi_alloc_recv_msg() tries to acquire another reference. Remove the stale explicit put and the now-dead user assignment. Keep the list_del() and ipmi_free_recv_msg() calls; they are the required rollback operations.
    Added Reference https://git.kernel.org/stable/c/6aa9e61c46465d231e9beddf56af7effd71be682
    Added Reference https://git.kernel.org/stable/c/7be349d4fcc5e065295b83418a22d27a68afbdb6
    Added Reference https://git.kernel.org/stable/c/ddbb6e3dc9bb4743de686aa1598c31e745cee76b
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
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Scope
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Availability Impact