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CVE-2026-64028

UnknownEPSS 0.18%

Last modified

CVE-2026-64028 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.18%

8.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 2e8578364061c4e88ae33bc20c2d6f64f365f6a2, < e3f5d42cdc2f167719564693675f1eead81378ea; >= dfd1cd57ee6067301841b7b0967c70f910a51150, < 37377b39ff86dacbc533275c1155210d4fd5dc91; >= e5c223f46c2e0691461dd97510c15e1f77148872, < 0402a1d3ddec565132867337ed44514a09d84728; >= 9399a92989354e34086f9a5c379493217df83c5e, < e91687643c440ca3997d67646e6f80b92edc6703; >= 3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0, < be4e99038c1603fa6b329d8ee3e364825e17c353; >= 0402c60abe769098d77f3b3bd1e29a97922b614b, < d6c8b3ebdcdb12b59ad4212acb137cc56cae453d; >= 6929e650db8451a9975ac0a631ba2d6e5d1e80ba, < 915c1254fe0788abddc31095b360e9dc98907a34; >= 5ec1d1e97de134beed3a5b08235a60fc1c51af96, < 576ec047d20b368b43c4d5db98c4f2e0f3c101ec
LinuxLinux>= 6.6.141, < 6.6.142; >= 6.12.91, < 6.12.92; >= 6.18.33, < 6.18.34; >= 7.0.10, < 7.0.11

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64028?
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.
How severe is CVE-2026-64028?
Severity scoring for CVE-2026-64028 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64028?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST