CVE-2026-74391
tracing: Bound synthetic-field strings with seq_buf
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Bound synthetic-field strings with seq_buf The synthetic field helpers build a prefixed synthetic variable name and a generated hist command in fixed MAX_FILTER_STR_VAL buffers. The current code appends those strings with raw strcat(), so long key lists, field names, or saved filters can run past the end of the staging buffers. Build both strings with seq_buf and propagate -E2BIG if either the synthetic variable name or the generated command exceeds MAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while using the helper intended for bounded command construction. [ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ]
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 15, 2026, 6:22 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74391
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.
No affected product recoded yet
Solution
- Update the Linux kernel to a patched version.
- Verify synthetic field string construction limits.
- Test tracing functionality post-update.
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-2026-74391.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74391 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-2026-74391
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-2026-74391 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74391 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.
-
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': '02205a6752f223779a1b0e9e8ffacbea6e717851', 'lessThan': '0c584c27f6649a93ec12061cc779a4bd8f7c1434', 'versionType': 'git'}, {'status': 'affected', 'version': '02205a6752f223779a1b0e9e8ffacbea6e717851', 'lessThan': '88b901fdc1662b131ff908cbd017333b61e7acc8', 'versionType': 'git'}, {'status': 'affected', 'version': '02205a6752f223779a1b0e9e8ffacbea6e717851', 'lessThan': 'baa333b2700a7fa3529d504529c8c10060fd687c', 'versionType': 'git'}, {'status': 'affected', 'version': '02205a6752f223779a1b0e9e8ffacbea6e717851', 'lessThan': 'cf334620036ad2250e008c7e7bb6646a3938b7b0', 'versionType': 'git'}, {'status': 'affected', 'version': '02205a6752f223779a1b0e9e8ffacbea6e717851', 'lessThan': 'f07883450eb14d1cf020b55d9f3a7ec5683bcd26', 'versionType': 'git'}], 'programFiles': ['kernel/trace/trace_events_hist.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'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': ['kernel/trace/trace_events_hist.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: tracing: Bound synthetic-field strings with seq_buf The synthetic field helpers build a prefixed synthetic variable name and a generated hist command in fixed MAX_FILTER_STR_VAL buffers. The current code appends those strings with raw strcat(), so long key lists, field names, or saved filters can run past the end of the staging buffers. Build both strings with seq_buf and propagate -E2BIG if either the synthetic variable name or the generated command exceeds MAX_FILTER_STR_VAL. This keeps the existing tracing-side limit while using the helper intended for bounded command construction. [ sdr: Moved struct seq_buf *s for upside-down x-mas tree formatting ] Added Reference https://git.kernel.org/stable/c/0c584c27f6649a93ec12061cc779a4bd8f7c1434 Added Reference https://git.kernel.org/stable/c/88b901fdc1662b131ff908cbd017333b61e7acc8 Added Reference https://git.kernel.org/stable/c/baa333b2700a7fa3529d504529c8c10060fd687c Added Reference https://git.kernel.org/stable/c/cf334620036ad2250e008c7e7bb6646a3938b7b0 Added Reference https://git.kernel.org/stable/c/f07883450eb14d1cf020b55d9f3a7ec5683bcd26