CVE-2026-64028 (GCVE-0-2026-64028)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
tracing: Avoid NULL return from hist_field_name() on truncation
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2e8578364061c4e88ae33bc20c2d6f64f365f6a2 , < e3f5d42cdc2f167719564693675f1eead81378ea (git)
Affected: dfd1cd57ee6067301841b7b0967c70f910a51150 , < 37377b39ff86dacbc533275c1155210d4fd5dc91 (git)
Affected: e5c223f46c2e0691461dd97510c15e1f77148872 , < 0402a1d3ddec565132867337ed44514a09d84728 (git)
Affected: 9399a92989354e34086f9a5c379493217df83c5e , < e91687643c440ca3997d67646e6f80b92edc6703 (git)
Affected: 3cb6cb9c5a547a1979ad74f38eefe8e3687d96e0 , < be4e99038c1603fa6b329d8ee3e364825e17c353 (git)
Affected: 0402c60abe769098d77f3b3bd1e29a97922b614b , < d6c8b3ebdcdb12b59ad4212acb137cc56cae453d (git)
Affected: 6929e650db8451a9975ac0a631ba2d6e5d1e80ba , < 915c1254fe0788abddc31095b360e9dc98907a34 (git)
Affected: 5ec1d1e97de134beed3a5b08235a60fc1c51af96 , < 576ec047d20b368b43c4d5db98c4f2e0f3c101ec (git)
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Linux Linux Affected: 6.6.141 , < 6.6.142 (semver)
Affected: 6.12.91 , < 6.12.92 (semver)
Affected: 6.18.33 , < 6.18.34 (semver)
Affected: 7.0.10 , < 7.0.11 (semver)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Avoid NULL return from hist_field_name() on truncation\n\nhist_field_name() returns \"\" everywhere except the fully-qualified\nVAR_REF/EXPR case, where snprintf() truncation returns NULL early\nand bypasses the bottom NULL-\u003e\"\" guard. Callers don\u0027t expect NULL:\nstrcat(expr, hist_field_name(field, 0)) at trace_events_hist.c:1758\nand the strcmp() in the sort-key match loop at :4804 both deref it.\n\nsystem and event_name are bounded by MAX_EVENT_NAME_LEN, but the\nfield name on a VAR_REF is kstrdup\u0027d from a histogram variable\nname parsed out of the trigger string and has no length cap, so\na long enough var name in a fully qualified reference can reach\nthe truncation path.\n\nKeep the length check but leave field_name as \"\" on overflow."
        }
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        "dateUpdated": "2026-07-19T15:39:19.102Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/576ec047d20b368b43c4d5db98c4f2e0f3c101ec"
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    "dateReserved": "2026-07-19T07:54:57.028Z",
    "dateUpdated": "2026-07-19T15:39:19.102Z",
    "state": "PUBLISHED"
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.