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tracing: Add NULL pointer check to trigger_data_free()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.167, 6.12.77, 6.18.17, 6.19.7, 6.6.130
CVEs
CVE-2026-23309
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 18:25 UTC · Revision 1

Source evidence

tracing: Add NULL pointer check to trigger_data_free()

core-osv · Original source

Published 25 Mar 2026, 10:27 UTC

In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.

osv:CVE-2026-23309

Kernel

Fixed versions: 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7

Complete source record
{
  "id": "4a21524e599116ed2aef404a838bc9085a98696121ecf89e3c7c7cbd5471d150",
  "url": "https://osv.dev/vulnerability/CVE-2026-23309",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tracing: Add NULL pointer check to trigger_data_free()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.",
    "evidence": "osv:CVE-2026-23309",
    "products": [
      {
        "name": {
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          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.77",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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          ],
          "versions": [
            "v6.1.166",
            "v6.1.165",
            "v6.6.129",
            "v6.6.128",
            "v6.12.76",
            "v6.12.75",
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            "v6.18.14",
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23309.json"
          }
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      ],
      "modified": "2026-10-28T02:30:31.649709565Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e",
        "https://git.kernel.org/stable/c/2ce8ece5a78da67834db7728edc801889a64f643",
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        "https://git.kernel.org/stable/c/457965c13f0837a289c9164b842d0860133f6274",
        "https://git.kernel.org/stable/c/477469223b2b840f436ce204333de87cb17e5d93",
        "https://git.kernel.org/stable/c/59c15b9cc453b74beb9f04c6c398717e73612dc3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23309.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23309",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23309.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23309",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498399,
  "published_at": "2026-03-25T10:27:04.828+00:00"
}