NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package kernel (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL6-KERNEL-18196443
- published22 Jul 2026
- disclosed19 Jul 2026
Introduced: 19 Jul 2026
NewCVE-2026-64028 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:6.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL.
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.
References
- https://access.redhat.com/security/cve/CVE-2026-64028
- https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728
- https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91
- https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec
- https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34
- https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353
- https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d
- https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea
- https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703