GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-23309 (GCVE-0-2026-23309)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:04
VLAI
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c10f0efe57728508d796ae4ba7abe4c14ec3d8ef , < 13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e (git)
Affected: 7e6556e9329bc484e9dcdab6e346d959267c0636 , < 59c15b9cc453b74beb9f04c6c398717e73612dc3 (git)
Affected: 9b0513905e0598b9f8cfccab8e47497aed5d935d , < 42b380f97d65e76e7b310facd525f730272daf57 (git)
Affected: 335dfe4bc6368e70e8c15419375cf609c4f85558 , < 2ce8ece5a78da67834db7728edc801889a64f643 (git)
Affected: e42efbe9754da78eafe11f6bd3ca9c8a094a752a , < 477469223b2b840f436ce204333de87cb17e5d93 (git)
Affected: 0550069cc25f513ce1f109c88f7c1f01d63297db , < 457965c13f0837a289c9164b842d0860133f6274 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.1.165 , < 6.1.167 (semver)
Affected: 6.6.128 , < 6.6.130 (semver)
Affected: 6.12.75 , < 6.12.77 (semver)
Affected: 6.18.14 , < 6.18.17 (semver)
Affected: 6.19.4 , < 6.19.7 (semver)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_trigger.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e",
              "status": "affected",
              "version": "c10f0efe57728508d796ae4ba7abe4c14ec3d8ef",
              "versionType": "git"
            },
            {
              "lessThan": "59c15b9cc453b74beb9f04c6c398717e73612dc3",
              "status": "affected",
              "version": "7e6556e9329bc484e9dcdab6e346d959267c0636",
              "versionType": "git"
            },
            {
              "lessThan": "42b380f97d65e76e7b310facd525f730272daf57",
              "status": "affected",
              "version": "9b0513905e0598b9f8cfccab8e47497aed5d935d",
              "versionType": "git"
            },
            {
              "lessThan": "2ce8ece5a78da67834db7728edc801889a64f643",
              "status": "affected",
              "version": "335dfe4bc6368e70e8c15419375cf609c4f85558",
              "versionType": "git"
            },
            {
              "lessThan": "477469223b2b840f436ce204333de87cb17e5d93",
              "status": "affected",
              "version": "e42efbe9754da78eafe11f6bd3ca9c8a094a752a",
              "versionType": "git"
            },
            {
              "lessThan": "457965c13f0837a289c9164b842d0860133f6274",
              "status": "affected",
              "version": "0550069cc25f513ce1f109c88f7c1f01d63297db",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_trigger.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.1.167",
              "status": "affected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.130",
              "status": "affected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.77",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.17",
              "status": "affected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThan": "6.19.7",
              "status": "affected",
              "version": "6.19.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "6.1.165",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "6.6.128",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.77",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.17",
                  "versionStartIncluding": "6.18.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.7",
                  "versionStartIncluding": "6.19.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Add NULL pointer check to trigger_data_free()\n\nIf trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse()\njumps to the out_free error path. While kfree() safely handles a NULL\npointer, trigger_data_free() does not. This causes a NULL pointer\ndereference in trigger_data_free() when evaluating\ndata-\u003ecmd_ops-\u003eset_filter.\n\nFix the problem by adding a NULL pointer check to trigger_data_free().\n\nThe problem was found by an experimental code review agent based on\ngemini-3.1-pro while reviewing backports into v6.18.y."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:04:23.455Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/59c15b9cc453b74beb9f04c6c398717e73612dc3"
        },
        {
          "url": "https://git.kernel.org/stable/c/42b380f97d65e76e7b310facd525f730272daf57"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ce8ece5a78da67834db7728edc801889a64f643"
        },
        {
          "url": "https://git.kernel.org/stable/c/477469223b2b840f436ce204333de87cb17e5d93"
        },
        {
          "url": "https://git.kernel.org/stable/c/457965c13f0837a289c9164b842d0860133f6274"
        }
      ],
      "title": "tracing: Add NULL pointer check to trigger_data_free()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23309",
    "datePublished": "2026-03-25T10:27:04.828Z",
    "dateReserved": "2026-01-13T15:37:45.994Z",
    "dateUpdated": "2026-05-11T22:04:23.455Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-23309",
      "date": "2026-09-15",
      "epss": "0.00123",
      "percentile": "0.02337"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23309\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:26.993\",\"lastModified\":\"2026-06-17T10:21:18.170\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Add NULL pointer check to trigger_data_free()\\n\\nIf trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse()\\njumps to the out_free error path. While kfree() safely handles a NULL\\npointer, trigger_data_free() does not. This causes a NULL pointer\\ndereference in trigger_data_free() when evaluating\\ndata-\u003ecmd_ops-\u003eset_filter.\\n\\nFix the problem by adding a NULL pointer check to trigger_data_free().\\n\\nThe problem was found by an experimental code review agent based on\\ngemini-3.1-pro while reviewing backports into v6.18.y.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ntracing: A\u00f1adir comprobaci\u00f3n de puntero NULL a trigger_data_free()\\n\\nSi trigger_data_alloc() falla y devuelve NULL, event_hist_trigger_parse() salta a la ruta de error out_free. Aunque kfree() maneja de forma segura un puntero NULL, trigger_data_free() no lo hace. Esto causa una desreferencia de puntero NULL en trigger_data_free() al evaluar data-\u0026gt;cmd_ops-\u0026gt;set_filter.\\n\\nCorregir el problema a\u00f1adiendo una comprobaci\u00f3n de puntero NULL a trigger_data_free().\\n\\nEl problema fue encontrado por un agente experimental de revisi\u00f3n de c\u00f3digo basado en gemini-3.1-pro mientras revisaba backports en v6.18.y.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events_trigger.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c10f0efe57728508d796ae4ba7abe4c14ec3d8ef\",\"lessThan\":\"13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7e6556e9329bc484e9dcdab6e346d959267c0636\",\"lessThan\":\"59c15b9cc453b74beb9f04c6c398717e73612dc3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9b0513905e0598b9f8cfccab8e47497aed5d935d\",\"lessThan\":\"42b380f97d65e76e7b310facd525f730272daf57\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"335dfe4bc6368e70e8c15419375cf609c4f85558\",\"lessThan\":\"2ce8ece5a78da67834db7728edc801889a64f643\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e42efbe9754da78eafe11f6bd3ca9c8a094a752a\",\"lessThan\":\"477469223b2b840f436ce204333de87cb17e5d93\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0550069cc25f513ce1f109c88f7c1f01d63297db\",\"lessThan\":\"457965c13f0837a289c9164b842d0860133f6274\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/trace/trace_events_trigger.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.1.165\",\"lessThan\":\"6.1.167\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.128\",\"lessThan\":\"6.6.130\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.75\",\"lessThan\":\"6.12.77\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.14\",\"lessThan\":\"6.18.17\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.4\",\"lessThan\":\"6.19.7\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.165\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"D54E2FD5-7EF9-426A-9AE1-8E8DA970BCC8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.128\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"2099D3D0-97C6-44C5-913D-E616B07A9237\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.75\",\"versionEndExcluding\":\"6.12.77\",\"matchCriteriaId\":\"84A22880-A425-402F-879A-9309659E3D36\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.18.14\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"4AEF99ED-2A46-4ECD-A9A4-D4D616C3DEE3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19.4\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"EABFC675-2A5E-4569-92F7-1E8942DA0683\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2ce8ece5a78da67834db7728edc801889a64f643\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/42b380f97d65e76e7b310facd525f730272daf57\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/457965c13f0837a289c9164b842d0860133f6274\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/477469223b2b840f436ce204333de87cb17e5d93\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/59c15b9cc453b74beb9f04c6c398717e73612dc3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:24:18+00:00",
      "cve": "CVE-2026-23309",
      "id": "CVE-2026-23309",
      "initial_release_date": "2026-03-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tracing: Add NULL pointer check to trigger_data_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23309.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-29T01:22:39Z",
      "cve": "CVE-2026-23309",
      "id": "CVE-2026-23309",
      "initial_release_date": "2026-03-25T16:56:42Z",
      "product_status:known_not_affected": "259",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-23309",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23309.json",
      "version": "7"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.