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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2025-04-01T15:26:50Z",
          "number": "1",
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          "date": "2026-08-25T12:54:03Z",
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    "title": "Security update on CVE-2025-21899"
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        {
          "category": "description",
          "text": "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 'hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)' > trigger\n bash: echo: write error: Invalid argument\n ~# echo 'hist:name=bad:keys=common_pid' > 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->reg(.., data, ..) [hist_register_trigger()] {\n          data->ops->init() [event_hist_trigger_init()] {\n            save_named_trigger(name, data) {\n              list_add(&data->named_list, &named_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(&data->list, &file->triggers); <<<---- SKIPPED!!! (this is important!)\n[..]\n out_unreg:\n      event_hist_unregister(.., data) {\n        cmd_ops->unreg(.., data, ..) [hist_unregister_trigger()] {\n          list_for_each_entry(iter, &file->triggers, list) {\n            if (!hist_trigger_match(data, iter, named_data, false))   <- never matches\n                continue;\n            [..]\n            test = iter;\n          }\n          if (test && test->ops->free) <<<-- test is NULL\n\n            test->ops->free(test) [event_hist_trigger_free()] {\n              [..]\n              if (data->name)\n                del_named_trigger(data) {\n                  list_del(&data->named_list);  <<<<-- NEVER gets removed!\n                }\n              }\n           }\n         }\n\n         [..]\n         kfree(data); <<<-- 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't 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->triggers to be properly populated.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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          "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64",
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          "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all",
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          "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64",
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          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all"
        ],
        "known_affected": [
          "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
          "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
          "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
          "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
          "Debian-10:libcpupower1-0:4.19.325-1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
          "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
          "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
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          "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
          "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64",
          "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all",
          "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64",
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          "Debian-10:linux-libc-dev-0:4.19.325-1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64",
          "Debian-10:linux-source-4.19-0:4.19.325-1.all",
          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-21899"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/435d2964af815aae456db554c62963b4515f19d0",
          "url": "https://git.kernel.org/stable/c/435d2964af815aae456db554c62963b4515f19d0"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/43b254d46c740bf9dbe65709afa021dd726dfa99",
          "url": "https://git.kernel.org/stable/c/43b254d46c740bf9dbe65709afa021dd726dfa99"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77",
          "url": "https://git.kernel.org/stable/c/5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e",
          "url": "https://git.kernel.org/stable/c/6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f1ae50cfb818ce1ac7a674406dfadb7653e2552d",
          "url": "https://git.kernel.org/stable/c/f1ae50cfb818ce1ac7a674406dfadb7653e2552d"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
        }
      ],
      "release_date": "2025-04-01T15:26:50Z",
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-06T12:18:15.845460Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
            "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
            "Debian-10:libcpupower1-0:4.19.325-1.amd64",
            "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
            "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
            "Debian-10:linux-doc-4.19-0:4.19.325-1.all",
            "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64",
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            "Debian-10:linux-kbuild-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-libc-dev-0:4.19.325-1.amd64",
            "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-source-4.19-0:4.19.325-1.all",
            "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1.amd64",
            "Debian-10:libcpupower-dev-0:4.19.325-1.amd64",
            "Debian-10:libcpupower1-0:4.19.325-1.amd64",
            "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1.amd64",
            "Debian-10:linux-config-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-cpupower-0:4.19.325-1.amd64",
            "Debian-10:linux-doc-4.19-0:4.19.325-1.all",
            "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1.amd64",
            "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1.all",
            "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1.amd64",
            "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1.amd64",
            "Debian-10:linux-kbuild-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-libc-dev-0:4.19.325-1.amd64",
            "Debian-10:linux-perf-4.19-0:4.19.325-1.amd64",
            "Debian-10:linux-source-4.19-0:4.19.325-1.all",
            "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}