tracing: Avoid NULL return from hist_field_name() on truncation
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.6.141 to before 6.6.142; 6.12.91 to before 6.12.92; 6.18.33 to before 6.18.34; 7.0.10 to before 7.0.11 | 6.6.142, 6.12.92, 6.18.34, 7.0.11 | Patch available | CNA |
- Linux VendorLinux Affected 6.6.141 to before 6.6.142; 6.12.91 to before 6.12.92; 6.18.33 to before 6.18.34; 7.0.10 to before 7.0.11 Fixed in 6.6.142, 6.12.92, 6.18.34, 7.0.11 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:6.6.141:*:*:*:*:*:*:* | 6.6.141 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.12.91:*:*:*:*:*:*:* | 6.12.91 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:* | 6.18.33 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:* | 7.0.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | 7.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | 7.1 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | 7.1 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | 7.1 rc4 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:6.6.141:*:*:*:*:*:*:* Versions 6.6.141 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.12.91:*:*:*:*:*:*:* Versions 6.12.91 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:* Versions 6.18.33 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:* Versions 7.0.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* Versions 7.1 rc4 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.6.142, 6.12.92, 6.18.34, 7.0.11
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-64028
- 2026-10-03 Alias added: GHSA-8p9w-3qjg-cv4w
- 2026-10-13 CVSS score added · NVD
- 2026-10-13 Weakness changed · NVD
References
Patch 8
- https://git.kernel.org/stable/c/e3f5d42cdc2f167719564693675f1eead81378ea
- https://git.kernel.org/stable/c/37377b39ff86dacbc533275c1155210d4fd5dc91
- https://git.kernel.org/stable/c/0402a1d3ddec565132867337ed44514a09d84728
- https://git.kernel.org/stable/c/e91687643c440ca3997d67646e6f80b92edc6703
- https://git.kernel.org/stable/c/be4e99038c1603fa6b329d8ee3e364825e17c353
- https://git.kernel.org/stable/c/d6c8b3ebdcdb12b59ad4212acb137cc56cae453d
- https://git.kernel.org/stable/c/915c1254fe0788abddc31095b360e9dc98907a34
- https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-64028 · CVE Program
- CVE-2026-64028 · NVD
- FIRST EPSS
- GHSA-8p9w-3qjg-cv4w · GitHub Advisory Database · CC BY 4.0
- CVE-2026-64028 · Red Hat security data · CC BY 4.0
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