CVE-2026-64028
tracing: Avoid NULL return from hist_field_name() on truncation
Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Avoid NULL return from hist_field_name() on truncation hist_field_name() returns "" everywhere except the fully-qualified VAR_REF/EXPR case, where snprintf() truncation returns NULL early and bypasses the bottom NULL->"" guard. Callers don't expect NULL: strcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758 and the strcmp() in the sort-key match loop at :4804 both deref it. system and event_name are bounded by MAX_EVENT_NAME_LEN, but the field name on a VAR_REF is kstrdup'd from a histogram variable name parsed out of the trigger string and has no length cap, so a long enough var name in a fully qualified reference can reach the truncation path. Keep the length check but leave field_name as "" on overflow.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 19, 2026, 4:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64028
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 the latest version.
- Review kernel patch notes for tracing module fixes.
- Apply relevant security patches to the kernel.
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-2026-64028.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64028 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-2026-64028
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-2026-64028 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64028 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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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 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': '2e8578364061c4e88ae33bc20c2d6f64f365f6a2', 'lessThan': 'e3f5d42cdc2f167719564693675f1eead81378ea', 'versionType': 'git'}, {'status': 'affected', 'version': 'dfd1cd57ee6067301841b7b0967c70f910a51150', 'lessThan': '37377b39ff86dacbc533275c1155210d4fd5dc91', 'versionType': 'git'}, {'status': 'affected', 'version': 'e5c223f46c2e0691461dd97510c15e1f77148872', 'lessThan': '0402a1d3ddec565132867337ed44514a09d84728', 'versionType': 'git'}, {'status': 'affected', 'version': '9399a92989354e34086f9a5c379493217df83c5e', 'lessThan': 'e91687643c440ca3997d67646e6f80b92edc6703', 'versionType': 'git'}, {'status': 'affected', 'version': '3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0', 'lessThan': 'be4e99038c1603fa6b329d8ee3e364825e17c353', 'versionType': 'git'}, {'status': 'affected', 'version': '0402c60abe769098d77f3b3bd1e29a97922b614b', 'lessThan': 'd6c8b3ebdcdb12b59ad4212acb137cc56cae453d', 'versionType': 'git'}, {'status': 'affected', 'version': '6929e650db8451a9975ac0a631ba2d6e5d1e80ba', 'lessThan': '915c1254fe0788abddc31095b360e9dc98907a34', 'versionType': 'git'}, {'status': 'affected', 'version': '5ec1d1e97de134beed3a5b08235a60fc1c51af96', 'lessThan': '576ec047d20b368b43c4d5db98c4f2e0f3c101ec', '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': '6.6.141', 'lessThan': '6.6.142', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.12.91', 'lessThan': '6.12.92', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.18.33', 'lessThan': '6.18.34', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.0.10', 'lessThan': '7.0.11', 'versionType': 'semver'}], 'programFiles': ['kernel/trace/trace_events_hist.c'], 'defaultStatus': 'unaffected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: tracing: Avoid NULL return from hist_field_name() on truncation hist_field_name() returns "" everywhere except the fully-qualified VAR_REF/EXPR case, where snprintf() truncation returns NULL early and bypasses the bottom NULL->"" guard. Callers don't expect NULL: strcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758 and the strcmp() in the sort-key match loop at :4804 both deref it. system and event_name are bounded by MAX_EVENT_NAME_LEN, but the field name on a VAR_REF is kstrdup'd from a histogram variable name parsed out of the trigger string and has no length cap, so a long enough var name in a fully qualified reference can reach the truncation path. Keep the length check but leave field_name as "" on overflow. Added Reference https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728 Added Reference https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91 Added Reference https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec Added Reference https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34 Added Reference https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353 Added Reference https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d Added Reference https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea Added Reference https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703