CVE-2026-68176
tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev If the mmio_pipe_open() fails to find a PCI device, the hiter->dev will be assigned to NULL. The mmiotrace read() function dereferences the hiter->dev if hiter exists. Change the test of the read to not only check hiter being NULL, but also the hiter->dev before dereferencing it.
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 17, 2026, 5:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the fix.
- Apply the mmiotrace read function patch.
- Ensure hiter->dev is checked before dereferencing.
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-2026-68176.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68176 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-2026-68176
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-2026-68176 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68176 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.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': 'faaf95135184208ee3ac6f33175c8d1800669dfc', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '201a01102c529772168181190cb084471082cf5c', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '8464427e1c177809a9488a97dfa2807d9dcf323b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '724cd84b0546c07806840fa658714488553d13a2', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '144f29e85702234b23d2a62abf723e6a17eb5427', 'versionType': 'git'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.27'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.27', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': 'faaf95135184208ee3ac6f33175c8d1800669dfc', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '201a01102c529772168181190cb084471082cf5c', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '8464427e1c177809a9488a97dfa2807d9dcf323b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '724cd84b0546c07806840fa658714488553d13a2', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '144f29e85702234b23d2a62abf723e6a17eb5427', 'versionType': 'git'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.27'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.27', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 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': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': 'faaf95135184208ee3ac6f33175c8d1800669dfc', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '201a01102c529772168181190cb084471082cf5c', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '8464427e1c177809a9488a97dfa2807d9dcf323b', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '724cd84b0546c07806840fa658714488553d13a2', 'versionType': 'git'}, {'status': 'affected', 'version': 'f984b51e0779a6dd30feedc41404013ca54e5d05', 'lessThan': '144f29e85702234b23d2a62abf723e6a17eb5427', 'versionType': 'git'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.27'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.27', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/trace/trace_mmiotrace.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: tracing: Fix mmiotrace possible NULL dereferencing of hiter->dev If the mmio_pipe_open() fails to find a PCI device, the hiter->dev will be assigned to NULL. The mmiotrace read() function dereferences the hiter->dev if hiter exists. Change the test of the read to not only check hiter being NULL, but also the hiter->dev before dereferencing it. Added Reference https://git.kernel.org/stable/c/144f29e85702234b23d2a62abf723e6a17eb5427 Added Reference https://git.kernel.org/stable/c/201a01102c529772168181190cb084471082cf5c Added Reference https://git.kernel.org/stable/c/724cd84b0546c07806840fa658714488553d13a2 Added Reference https://git.kernel.org/stable/c/8464427e1c177809a9488a97dfa2807d9dcf323b Added Reference https://git.kernel.org/stable/c/faaf95135184208ee3ac6f33175c8d1800669dfc