CVE-2026-64028tracing: Avoid NULL return from hist_field_name() on truncation
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 2e8578364061c4e88ae33bc20c2d6f64f365f6a2 – < e3f5d42cdc2f167719564693675f1eead81378ea
- affected dfd1cd57ee6067301841b7b0967c70f910a51150 – < 37377b39ff86dacbc533275c1155210d4fd5dc91
- affected e5c223f46c2e0691461dd97510c15e1f77148872 – < 0402a1d3ddec565132867337ed44514a09d84728
- affected 9399a92989354e34086f9a5c379493217df83c5e – < e91687643c440ca3997d67646e6f80b92edc6703
- affected 3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0 – < be4e99038c1603fa6b329d8ee3e364825e17c353
- affected 0402c60abe769098d77f3b3bd1e29a97922b614b – < d6c8b3ebdcdb12b59ad4212acb137cc56cae453d
- affected 6929e650db8451a9975ac0a631ba2d6e5d1e80ba – < 915c1254fe0788abddc31095b360e9dc98907a34
- affected 5ec1d1e97de134beed3a5b08235a60fc1c51af96 – < 576ec047d20b368b43c4d5db98c4f2e0f3c101ec
- affected 6.6.141 – < 6.6.142
- affected 6.12.91 – < 6.12.92
- affected 6.18.33 – < 6.18.34
- affected 7.0.10 – < 7.0.11
References
References8
- https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea (opens in a new tab)
- https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91 (opens in a new tab)
- https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728 (opens in a new tab)
- https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703 (opens in a new tab)
- https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353 (opens in a new tab)
- https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d (opens in a new tab)
- https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34 (opens in a new tab)
- https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45601 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64028)Record last updated .