CVE-2025-21899

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-21899", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.783Z", "datePublished": "2025-04-01T15:26:50.791Z", "dateUpdated": "2026-10-15T21:51:55.265Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:55:14.373Z"}, "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 '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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached only by writing a hist trigger command to a tracefs file (`/sys/kernel/tracing/events/*/trigger`) via the write(2) syscall. There is no network or remote data path into `event_hist_trigger_parse()`.\nAC:L - Triggering is fully deterministic \u2014 one failing `hist:name=bad:...onmax(bogus)...` write leaves the freed object linked in the global `named_triggers` list, and a second `hist:name=bad` write dereferences it; no race and no uncontrollable preconditions. `CONFIG_HIST_TRIGGERS=y` is standard in mainstream distro and Android kernels, and slab reclaim of the freed `event_trigger_data` is attacker-influenced via ordinary heap spraying.\nPR:L - No capability check exists on the code path; access is gated purely by tracefs file permissions, and tracefs is routinely delegated to a non-root tracing/shell group (Android shell, ChromeOS debugd, perf/tracing groups) via the `gid=` mount option. A local unprivileged user with that ordinary tracing access can execute the full sequence.\nUI:N - The attacker performs both writes themselves; no victim action or cooperation is needed at any point.\nS:U - The use-after-free and list corruption occur in kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `find_named_trigger()` and `hist_trigger_match()` dereference the freed object's `name` and `private_data` pointers, so after reclaiming the slab object the attacker controls those pointers and obtains an arbitrary kernel-memory read primitive, plus leakage of the `named_triggers` list-head address.\nI:H - The freed object remains on a global list, so subsequent `list_add`/`list_del` operations write through attacker-controlled `named_list` pointers, and `data->private_data = named_data->private_data` produces type confusion into `hist_trigger_data` \u2014 a classic UAF write primitive usable for control-flow hijack.\nA:H - As stated in the commit, the second named-hist registration causes a use-after-free that crashes the kernel; list corruption reliably produces an oops or panic, denying service to the whole system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77", "status": "affected", "versionType": "git"}, {"version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "43b254d46c740bf9dbe65709afa021dd726dfa99", "status": "affected", "versionType": "git"}, {"version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "435d2964af815aae456db554c62963b4515f19d0", "status": "affected", "versionType": "git"}, {"version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "f1ae50cfb818ce1ac7a674406dfadb7653e2552d", "status": "affected", "versionType": "git"}, {"version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_hist.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.130", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.81", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.18", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.6", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.6.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.12.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.13.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.14"}]}]}], "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"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:38:45.924Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-21899", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:43:39.275390Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:55.265Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:38:45.924Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-21899", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:43:39.275390Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:43:39.748Z"}}], "cna": {"title": "tracing: Fix bad hist from corrupting named_triggers list", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached only by writing a hist trigger command to a tracefs file (`/sys/kernel/tracing/events/*/trigger`) via the write(2) syscall. There is no network or remote data path into `event_hist_trigger_parse()`.\nAC:L - Triggering is fully deterministic \u2014 one failing `hist:name=bad:...onmax(bogus)...` write leaves the freed object linked in the global `named_triggers` list, and a second `hist:name=bad` write dereferences it; no race and no uncontrollable preconditions. `CONFIG_HIST_TRIGGERS=y` is standard in mainstream distro and Android kernels, and slab reclaim of the freed `event_trigger_data` is attacker-influenced via ordinary heap spraying.\nPR:L - No capability check exists on the code path; access is gated purely by tracefs file permissions, and tracefs is routinely delegated to a non-root tracing/shell group (Android shell, ChromeOS debugd, perf/tracing groups) via the `gid=` mount option. A local unprivileged user with that ordinary tracing access can execute the full sequence.\nUI:N - The attacker performs both writes themselves; no victim action or cooperation is needed at any point.\nS:U - The use-after-free and list corruption occur in kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `find_named_trigger()` and `hist_trigger_match()` dereference the freed object's `name` and `private_data` pointers, so after reclaiming the slab object the attacker controls those pointers and obtains an arbitrary kernel-memory read primitive, plus leakage of the `named_triggers` list-head address.\nI:H - The freed object remains on a global list, so subsequent `list_add`/`list_del` operations write through attacker-controlled `named_list` pointers, and `data->private_data = named_data->private_data` produces type confusion into `hist_trigger_data` \u2014 a classic UAF write primitive usable for control-flow hijack.\nA:H - As stated in the commit, the second named-hist registration causes a use-after-free that crashes the kernel; list corruption reliably produces an oops or panic, denying service to the whole system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77", "versionType": "git"}, {"status": "affected", "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "43b254d46c740bf9dbe65709afa021dd726dfa99", "versionType": "git"}, {"status": "affected", "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "435d2964af815aae456db554c62963b4515f19d0", "versionType": "git"}, {"status": "affected", "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "f1ae50cfb818ce1ac7a674406dfadb7653e2552d", "versionType": "git"}, {"status": "affected", "version": "067fe038e70f6e64960d26a79c4df5f1413d0f13", "lessThan": "6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e", "versionType": "git"}], "programFiles": ["kernel/trace/trace_events_hist.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.130", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.81", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.18", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.6", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/trace/trace_events_hist.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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 '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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.130", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.81", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.18", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.6", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14", "versionStartIncluding": "4.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:55:14.373Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21899", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:51:55.265Z", "dateReserved": "2024-12-29T08:45:45.783Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-04-01T15:26:50.791Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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[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."}, {"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 'hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)' &gt; trigger bash: echo: error de escritura: argumento no v\u00e1lido ~# echo 'hist:name=bad:keys=common_pid' &gt; 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-&gt;reg(.., data, ..) [hist_register_trigger()] { data-&gt;ops-&gt;init() [event_hist_trigger_init()] { save_named_trigger(name, data) { list_add(&amp;data-&gt;named_list, &amp;named_triggers); } } } } ret = create_actions(); (return -EINVAL) if (ret) goto out_unreg; [..] ret = hist_trigger_enable(data, ...) { list_add_tail_rcu(&amp;data-&gt;list, &amp;file-&gt;triggers); &lt;&lt;&lt;---- \u00a1\u00a1\u00a1SALTAR!!! (\u00a1esto es importante!) [..] out_unreg: event_hist_unregister(.., data) { cmd_ops-&gt;unreg(.., data, ..) [hist_unregister_trigger()] { list_for_each_entry(iter, &amp;file-&gt;triggers, list) { if (!hist_trigger_match(data, iter, named_data, false)) &lt;- never matches continue; [..] test = iter; } if (test &amp;&amp; test-&gt;ops-&gt;free) &lt;&lt;&lt;-- test is NULL test-&gt;ops-&gt;free(test) [event_hist_trigger_free()] { [..] if (data-&gt;name) del_named_trigger(data) { list_del(&amp;data-&gt;named_list); &lt;&lt;&lt;&lt;-- \u00a1NUNCA se elimina! } } } } [..] kfree(datos); &lt;&lt;&lt;-- 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."}], "id": "CVE-2025-21899", "lastModified": "2026-10-15T22:18:11.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21899", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:43:39.275390Z", "version": "2.0.3"}}]}, "published": "2025-04-01T16:15:20.327", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/435d2964af815aae456db554c62963b4515f19d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/43b254d46c740bf9dbe65709afa021dd726dfa99"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1ae50cfb818ce1ac7a674406dfadb7653e2552d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: tracing: Fix bad hist from corrupting named_triggers list", "id": "2356628", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2356628"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntracing: Fix bad hist from corrupting named_triggers list\nThe following commands causes a crash:\n~# cd /sys/kernel/tracing/events/rcu/rcu_callback\n~# echo 'hist:name=bad:keys=common_pid:onmax(bogus).save(common_pid)' > trigger\nbash: echo: write error: Invalid argument\n~# echo 'hist:name=bad:keys=common_pid' > trigger\nBecause the following occurs:\nevent_trigger_write() {\ntrigger_process_regex() {\nevent_hist_trigger_parse() {\ndata = event_trigger_alloc(..);\nevent_trigger_register(.., data) {\ncmd_ops->reg(.., data, ..) [hist_register_trigger()] {\ndata->ops->init() [event_hist_trigger_init()] {\nsave_named_trigger(name, data) {\nlist_add(&data->named_list, &named_triggers);\n}\n}\n}\n}\nret = create_actions(); (return -EINVAL)\nif (ret)\ngoto out_unreg;\n[..]\nret = hist_trigger_enable(data, ...) {\nlist_add_tail_rcu(&data->list, &file->triggers); <<<---- SKIPPED!!! (this is important!)\n[..]\nout_unreg:\nevent_hist_unregister(.., data) {\ncmd_ops->unreg(.., data, ..) [hist_unregister_trigger()] {\nlist_for_each_entry(iter, &file->triggers, list) {\nif (!hist_trigger_match(data, iter, named_data, false)) <- never matches\ncontinue;\n[..]\ntest = iter;\n}\nif (test && test->ops->free) <<<-- test is NULL\ntest->ops->free(test) [event_hist_trigger_free()] {\n[..]\nif (data->name)\ndel_named_trigger(data) {\nlist_del(&data->named_list); <<<<-- NEVER gets removed!\n}\n}\n}\n}\n[..]\nkfree(data); <<<-- frees item but it is still on list\nThe next time a hist with name is registered, it causes an u-a-f bug and\nthe kernel can crash.\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.\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."], "name": "CVE-2025-21899", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21899\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21899\nhttps://lore.kernel.org/linux-cve-announce/2025040132-CVE-2025-21899-bf75@gregkh/T"], "threat_severity": "Moderate"}

{}