tracing: Avoid NULL return from hist_field_name() on truncation
Summary
| CVE | CVE-2026-64028 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-19 16:17:42 UTC |
| Updated | 2026-07-19 16:17:42 UTC |
| 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. |
Risk And Classification
EPSS: 0.001850000 probability, percentile 0.083480000 (date 2026-07-20)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 2e8578364061c4e88ae33bc20c2d6f64f365f6a2 e3f5d42cdc2f167719564693675f1eead81378ea git | Not specified |
| CNA | Linux | Linux | affected dfd1cd57ee6067301841b7b0967c70f910a51150 37377b39ff86dacbc533275c1155210d4fd5dc91 git | Not specified |
| CNA | Linux | Linux | affected e5c223f46c2e0691461dd97510c15e1f77148872 0402a1d3ddec565132867337ed44514a09d84728 git | Not specified |
| CNA | Linux | Linux | affected 9399a92989354e34086f9a5c379493217df83c5e e91687643c440ca3997d67646e6f80b92edc6703 git | Not specified |
| CNA | Linux | Linux | affected 3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0 be4e99038c1603fa6b329d8ee3e364825e17c353 git | Not specified |
| CNA | Linux | Linux | affected 0402c60abe769098d77f3b3bd1e29a97922b614b d6c8b3ebdcdb12b59ad4212acb137cc56cae453d git | Not specified |
| CNA | Linux | Linux | affected 6929e650db8451a9975ac0a631ba2d6e5d1e80ba 915c1254fe0788abddc31095b360e9dc98907a34 git | Not specified |
| CNA | Linux | Linux | affected 5ec1d1e97de134beed3a5b08235a60fc1c51af96 576ec047d20b368b43c4d5db98c4f2e0f3c101ec git | Not specified |
| CNA | Linux | Linux | affected 6.6.141 6.6.142 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.91 6.12.92 semver | Not specified |
| CNA | Linux | Linux | affected 6.18.33 6.18.34 semver | Not specified |
| CNA | Linux | Linux | affected 7.0.10 7.0.11 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.