{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-09T05:54:38.337","vulnerabilities":[{"cve":{"id":"CVE-2021-47451","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-05-22T07:15:10.220","lastModified":"2025-09-24T01:18:15.240","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value\n\nCurrently, when the rule related to IDLETIMER is added, idletimer_tg timer\nstructure is initialized by kmalloc on executing idletimer_tg_create\nfunction. However, in this process timer->timer_type is not defined to\na specific value. Thus, timer->timer_type has garbage value and it occurs\nkernel panic. So, this commit fixes the panic by initializing\ntimer->timer_type using kzalloc instead of kmalloc.\n\nTest commands:\n    # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test\n    $ cat /sys/class/xt_idletimer/timers/test\n      Killed\n\nSplat looks like:\n    BUG: KASAN: user-memory-access in alarm_expires_remaining+0x49/0x70\n    Read of size 8 at addr 0000002e8c7bc4c8 by task cat/917\n    CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e\n    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n    Call Trace:\n     dump_stack_lvl+0x6e/0x9c\n     kasan_report.cold+0x112/0x117\n     ? alarm_expires_remaining+0x49/0x70\n     __asan_load8+0x86/0xb0\n     alarm_expires_remaining+0x49/0x70\n     idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d]\n     dev_attr_show+0x3c/0x60\n     sysfs_kf_seq_show+0x11d/0x1f0\n     ? device_remove_bin_file+0x20/0x20\n     kernfs_seq_show+0xa4/0xb0\n     seq_read_iter+0x29c/0x750\n     kernfs_fop_read_iter+0x25a/0x2c0\n     ? __fsnotify_parent+0x3d1/0x570\n     ? iov_iter_init+0x70/0x90\n     new_sync_read+0x2a7/0x3d0\n     ? __x64_sys_llseek+0x230/0x230\n     ? rw_verify_area+0x81/0x150\n     vfs_read+0x17b/0x240\n     ksys_read+0xd9/0x180\n     ? vfs_write+0x460/0x460\n     ? do_syscall_64+0x16/0xc0\n     ? lockdep_hardirqs_on+0x79/0x120\n     __x64_sys_read+0x43/0x50\n     do_syscall_64+0x3b/0xc0\n     entry_SYSCALL_64_after_hwframe+0x44/0xae\n    RIP: 0033:0x7f0cdc819142\n    Code: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24\n    RSP: 002b:00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\n    RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f0cdc819142\n    RDX: 0000000000020000 RSI: 00007f0cdc032000 RDI: 0000000000000003\n    RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000\n    R10: 0000000000000022 R11: 0000000000000246 R12: 00005607e9ee31f0\n    R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000"},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: xt_IDLETIMER: corrige el pánico que ocurre cuando timer_type tiene valor basura Actualmente, cuando se agrega la regla relacionada con IDLETIMER, kmalloc inicializa la estructura del temporizador idletimer_tg al ejecutar la función idletimer_tg_create. Sin embargo, en este proceso timer-&gt;timer_type no está definido en un valor específico. Por lo tanto, timer-&gt;timer_type tiene un valor basura y se produce un pánico en el kernel. Entonces, esta confirmación soluciona el pánico al inicializar timer-&gt;timer_type usando kzalloc en lugar de kmalloc. Comandos de prueba: # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test $ cat /sys/class/xt_idletimer/timers/test Killed Splat se ve así: ERROR: KASAN: acceso a memoria de usuario en alarm_expires_remaining+0x49/ 0x70 Lectura del tamaño 8 en la dirección 0000002e8c7bc4c8 por tarea cat/917 CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e Nombre del hardware: PC estándar QEMU (Q35 + ICH9, 009), BIOS 1.13.0- 1ubuntu1.1 01/04/2014 Seguimiento de llamadas: dump_stack_lvl+0x6e/0x9c kasan_report.cold+0x112/0x117 ? alarm_expires_remaining+0x49/0x70 __asan_load8+0x86/0xb0 alarm_expires_remaining+0x49/0x70 idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d] tr_show+0x3c/0x60 sysfs_kf_seq_show+0x11d/0x1f0 ? device_remove_bin_file+0x20/0x20 kernfs_seq_show+0xa4/0xb0 seq_read_iter+0x29c/0x750 kernfs_fop_read_iter+0x25a/0x2c0 ? __fsnotify_parent+0x3d1/0x570? iov_iter_init+0x70/0x90 new_sync_read+0x2a7/0x3d0? __x64_sys_llseek+0x230/0x230 ? rw_verify_area+0x81/0x150 vfs_read+0x17b/0x240 ksys_read+0xd9/0x180 ? vfs_write+0x460/0x460? do_syscall_64+0x16/0xc0? lockdep_hardirqs_on+0x79/0x120 __x64_sys_read+0x43/0x50 do_syscall_64+0x3b/0xc0 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0cdc819142 Código: c0 e9 c2 fe ff ff 50 48 8d 3d 3a ca 0a 00 e8 f5 19 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89 54 24 RSP: :00007fff28eee5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000020000 RCX: 00007f0cdc819142 RDX: 0000000000020000 RSI: 00007f0cdc03200 0 RDI: 0000000000000003 RBP: 00007f0cdc032000 R08: 00007f0cdc031010 R09: 0000000000000000 R10: 0000000000000022 R11: 00000000000000246 R 12: 00005607e9ee31f0 R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000"}],"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-908"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.76","matchCriteriaId":"337EB464-BC23-4BF5-B901-A933B3ABA6A7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.14.15","matchCriteriaId":"63BD46C4-473F-45F9-93E9-F67D955321D8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*","matchCriteriaId":"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*","matchCriteriaId":"60134C3A-06E4-48C1-B04F-2903732A4E56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*","matchCriteriaId":"0460DA88-8FE1-46A2-9DDA-1F1ABA552E71"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*","matchCriteriaId":"AF55383D-4DF2-45DC-93F7-571F4F978EAB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*","matchCriteriaId":"9E9481B2-8AA6-4CBD-B5D3-C10F51FF6D01"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*","matchCriteriaId":"EBD45831-4B79-42BC-ABC0-86870F0DEA89"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}