CVE-2025-21899 (GCVE-0-2025-21899)
Vulnerability from cvelistv5
Published
2025-04-01 15:26
Modified
2025-05-04 07:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix bad hist from corrupting named_triggers list The following commands causes a crash: ~# cd /sys/kernel/tracing/events/rcu/rcu_callback ~# echo 'hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)' > trigger bash: echo: write error: Invalid argument ~# echo 'hist:name=bad:keys=common_pid' > trigger Because the following occurs: event_trigger_write() { trigger_process_regex() { event_hist_trigger_parse() { data = event_trigger_alloc(..); event_trigger_register(.., data) { cmd_ops->reg(.., data, ..) [hist_register_trigger()] { data->ops->init() [event_hist_trigger_init()] { save_named_trigger(name, data) { list_add(&data->named_list, &named_triggers); } } } } ret = create_actions(); (return -EINVAL) if (ret) goto out_unreg; [..] ret = hist_trigger_enable(data, ...) { list_add_tail_rcu(&data->list, &file->triggers); <<<---- SKIPPED!!! (this is important!) [..] out_unreg: event_hist_unregister(.., data) { cmd_ops->unreg(.., data, ..) [hist_unregister_trigger()] { list_for_each_entry(iter, &file->triggers, list) { if (!hist_trigger_match(data, iter, named_data, false)) <- never matches continue; [..] test = iter; } if (test && test->ops->free) <<<-- test is NULL test->ops->free(test) [event_hist_trigger_free()] { [..] if (data->name) del_named_trigger(data) { list_del(&data->named_list); <<<<-- NEVER gets removed! } } } } [..] kfree(data); <<<-- frees item but it is still on list The next time a hist with name is registered, it causes an u-a-f bug and the kernel can crash. Move the code around such that if event_trigger_register() succeeds, the next thing called is hist_trigger_enable() which adds it to the list. A bunch of actions is called if get_named_trigger_data() returns false. But that doesn't need to be called after event_trigger_register(), so it can be moved up, allowing event_trigger_register() to be called just before hist_trigger_enable() keeping them together and allowing the file->triggers to be properly populated.
References
Impacted products
Vendor Product Version
Linux Linux Version: 067fe038e70f6e64960d26a79c4df5f1413d0f13
Version: 067fe038e70f6e64960d26a79c4df5f1413d0f13
Version: 067fe038e70f6e64960d26a79c4df5f1413d0f13
Version: 067fe038e70f6e64960d26a79c4df5f1413d0f13
Version: 067fe038e70f6e64960d26a79c4df5f1413d0f13
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
              "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13",
              "versionType": "git"
            },
            {
              "lessThan": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e",
              "status": "affected",
              "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.130",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.81",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.18",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.6",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix bad hist from corrupting named_triggers list\n\nThe following commands causes a crash:\n\n ~# cd /sys/kernel/tracing/events/rcu/rcu_callback\n ~# echo \u0027hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)\u0027 \u003e trigger\n bash: echo: write error: Invalid argument\n ~# echo \u0027hist:name=bad:keys=common_pid\u0027 \u003e trigger\n\nBecause the following occurs:\n\nevent_trigger_write() {\n  trigger_process_regex() {\n    event_hist_trigger_parse() {\n\n      data = event_trigger_alloc(..);\n\n      event_trigger_register(.., data) {\n        cmd_ops-\u003ereg(.., data, ..) [hist_register_trigger()] {\n          data-\u003eops-\u003einit() [event_hist_trigger_init()] {\n            save_named_trigger(name, data) {\n              list_add(\u0026data-\u003enamed_list, \u0026named_triggers);\n            }\n          }\n        }\n      }\n\n      ret = create_actions(); (return -EINVAL)\n      if (ret)\n        goto out_unreg;\n[..]\n      ret = hist_trigger_enable(data, ...) {\n        list_add_tail_rcu(\u0026data-\u003elist, \u0026file-\u003etriggers); \u003c\u003c\u003c---- SKIPPED!!! (this is important!)\n[..]\n out_unreg:\n      event_hist_unregister(.., data) {\n        cmd_ops-\u003eunreg(.., data, ..) [hist_unregister_trigger()] {\n          list_for_each_entry(iter, \u0026file-\u003etriggers, list) {\n            if (!hist_trigger_match(data, iter, named_data, false))   \u003c- never matches\n                continue;\n            [..]\n            test = iter;\n          }\n          if (test \u0026\u0026 test-\u003eops-\u003efree) \u003c\u003c\u003c-- test is NULL\n\n            test-\u003eops-\u003efree(test) [event_hist_trigger_free()] {\n              [..]\n              if (data-\u003ename)\n                del_named_trigger(data) {\n                  list_del(\u0026data-\u003enamed_list);  \u003c\u003c\u003c\u003c-- NEVER gets removed!\n                }\n              }\n           }\n         }\n\n         [..]\n         kfree(data); \u003c\u003c\u003c-- frees item but it is still on list\n\nThe next time a hist with name is registered, it causes an u-a-f bug and\nthe kernel can crash.\n\nMove the code around such that if event_trigger_register() succeeds, the\nnext thing called is hist_trigger_enable() which adds it to the list.\n\nA bunch of actions is called if get_named_trigger_data() returns false.\nBut that doesn\u0027t need to be called after event_trigger_register(), so it\ncan be moved up, allowing event_trigger_register() to be called just\nbefore hist_trigger_enable() keeping them together and allowing the\nfile-\u003etriggers to be properly populated."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:23:47.842Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77"
        },
        {
          "url": "https://git.kernel.org/stable/c/43b254d46c740bf9dbe65709afa021dd726dfa99"
        },
        {
          "url": "https://git.kernel.org/stable/c/435d2964af815aae456db554c62963b4515f19d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1ae50cfb818ce1ac7a674406dfadb7653e2552d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e"
        }
      ],
      "title": "tracing: Fix bad hist from corrupting named_triggers list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21899",
    "datePublished": "2025-04-01T15:26:50.791Z",
    "dateReserved": "2024-12-29T08:45:45.783Z",
    "dateUpdated": "2025-05-04T07:23:47.842Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21899\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-01T16:15:20.327\",\"lastModified\":\"2025-04-01T20:26:01.990\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Fix bad hist from corrupting named_triggers list\\n\\nThe following commands causes a crash:\\n\\n ~# cd /sys/kernel/tracing/events/rcu/rcu_callback\\n ~# echo \u0027hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)\u0027 \u003e trigger\\n bash: echo: write error: Invalid argument\\n ~# echo \u0027hist:name=bad:keys=common_pid\u0027 \u003e trigger\\n\\nBecause the following occurs:\\n\\nevent_trigger_write() {\\n  trigger_process_regex() {\\n    event_hist_trigger_parse() {\\n\\n      data = event_trigger_alloc(..);\\n\\n      event_trigger_register(.., data) {\\n        cmd_ops-\u003ereg(.., data, ..) [hist_register_trigger()] {\\n          data-\u003eops-\u003einit() [event_hist_trigger_init()] {\\n            save_named_trigger(name, data) {\\n              list_add(\u0026data-\u003enamed_list, \u0026named_triggers);\\n            }\\n          }\\n        }\\n      }\\n\\n      ret = create_actions(); (return -EINVAL)\\n      if (ret)\\n        goto out_unreg;\\n[..]\\n      ret = hist_trigger_enable(data, ...) {\\n        list_add_tail_rcu(\u0026data-\u003elist, \u0026file-\u003etriggers); \u003c\u003c\u003c---- SKIPPED!!! (this is important!)\\n[..]\\n out_unreg:\\n      event_hist_unregister(.., data) {\\n        cmd_ops-\u003eunreg(.., data, ..) [hist_unregister_trigger()] {\\n          list_for_each_entry(iter, \u0026file-\u003etriggers, list) {\\n            if (!hist_trigger_match(data, iter, named_data, false))   \u003c- never matches\\n                continue;\\n            [..]\\n            test = iter;\\n          }\\n          if (test \u0026\u0026 test-\u003eops-\u003efree) \u003c\u003c\u003c-- test is NULL\\n\\n            test-\u003eops-\u003efree(test) [event_hist_trigger_free()] {\\n              [..]\\n              if (data-\u003ename)\\n                del_named_trigger(data) {\\n                  list_del(\u0026data-\u003enamed_list);  \u003c\u003c\u003c\u003c-- NEVER gets removed!\\n                }\\n              }\\n           }\\n         }\\n\\n         [..]\\n         kfree(data); \u003c\u003c\u003c-- frees item but it is still on list\\n\\nThe next time a hist with name is registered, it causes an u-a-f bug and\\nthe kernel can crash.\\n\\nMove the code around such that if event_trigger_register() succeeds, the\\nnext thing called is hist_trigger_enable() which adds it to the list.\\n\\nA bunch of actions is called if get_named_trigger_data() returns false.\\nBut that doesn\u0027t need to be called after event_trigger_register(), so it\\ncan be moved up, allowing event_trigger_register() to be called just\\nbefore hist_trigger_enable() keeping them together and allowing the\\nfile-\u003etriggers to be properly populated.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing: Fix bad hist from corrupting named_triggers list Los siguientes comandos provocan un bloqueo: ~# cd /sys/kernel/tracing/events/rcu/rcu_callback ~# echo \u0027hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)\u0027 \u0026gt; trigger bash: echo: error de escritura: argumento no v\u00e1lido ~# echo \u0027hist:name=bad:keys=common_pid\u0027 \u0026gt; trigger Porque ocurre lo siguiente: event_trigger_write() { trigger_process_regex() { event_hist_trigger_parse() { data = event_trigger_alloc(..); event_trigger_register(.., data) { cmd_ops-\u0026gt;reg(.., data, ..) [hist_register_trigger()] { data-\u0026gt;ops-\u0026gt;init() [event_hist_trigger_init()] { save_named_trigger(name, data) { list_add(\u0026amp;data-\u0026gt;named_list, \u0026amp;named_triggers); } } } } ret = create_actions(); (return -EINVAL) if (ret) goto out_unreg; [..] ret = hist_trigger_enable(data, ...) { list_add_tail_rcu(\u0026amp;data-\u0026gt;list, \u0026amp;file-\u0026gt;triggers); \u0026lt;\u0026lt;\u0026lt;---- \u00a1\u00a1\u00a1SALTAR!!! (\u00a1esto es importante!) [..] out_unreg: event_hist_unregister(.., data) { cmd_ops-\u0026gt;unreg(.., data, ..) [hist_unregister_trigger()] { list_for_each_entry(iter, \u0026amp;file-\u0026gt;triggers, list) { if (!hist_trigger_match(data, iter, named_data, false)) \u0026lt;- never matches continue; [..] test = iter; } if (test \u0026amp;\u0026amp; test-\u0026gt;ops-\u0026gt;free) \u0026lt;\u0026lt;\u0026lt;-- test is NULL test-\u0026gt;ops-\u0026gt;free(test) [event_hist_trigger_free()] { [..] if (data-\u0026gt;name) del_named_trigger(data) { list_del(\u0026amp;data-\u0026gt;named_list); \u0026lt;\u0026lt;\u0026lt;\u0026lt;-- \u00a1NUNCA se elimina! } } } } [..] kfree(datos); \u0026lt;\u0026lt;\u0026lt;-- libera el elemento, pero sigue en la lista. La pr\u00f3xima vez que se registre un hist con nombre, se producir\u00e1 un error de uaf y el kernel podr\u00eda bloquearse. Desplace el c\u00f3digo de forma que, si event_trigger_register() tiene \u00e9xito, se llame a hist_trigger_enable(), lo que lo a\u00f1ade a la lista. Se invocan varias acciones si get_named_trigger_data() devuelve falso. Sin embargo, no es necesario llamarlo despu\u00e9s de event_trigger_register(), por lo que se puede adelantar, lo que permite llamar a event_trigger_register() justo antes de hist_trigger_enable(), manteni\u00e9ndolos juntos y permitiendo que los disparadores de archivo se rellenen correctamente.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/435d2964af815aae456db554c62963b4515f19d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43b254d46c740bf9dbe65709afa021dd726dfa99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1ae50cfb818ce1ac7a674406dfadb7653e2552d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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