{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-20T00:34:10.105","vulnerabilities":[{"cve":{"id":"CVE-2022-49540","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-02-26T07:01:29.947","lastModified":"2025-10-21T12:04:17.460","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcu-tasks: Fix race in schedule and flush work\n\nWhile booting secondary CPUs, cpus_read_[lock/unlock] is not keeping\nonline cpumask stable. The transient online mask results in below\ncalltrace.\n\n[ 0.324121] CPU1: Booted secondary processor 0x0000000001 [0x410fd083]\n[ 0.346652] Detected PIPT I-cache on CPU2\n[ 0.347212] CPU2: Booted secondary processor 0x0000000002 [0x410fd083]\n[ 0.377255] Detected PIPT I-cache on CPU3\n[ 0.377823] CPU3: Booted secondary processor 0x0000000003 [0x410fd083]\n[ 0.379040] ------------[ cut here ]------------\n[ 0.383662] WARNING: CPU: 0 PID: 10 at kernel/workqueue.c:3084 __flush_work+0x12c/0x138\n[ 0.384850] Modules linked in:\n[ 0.385403] CPU: 0 PID: 10 Comm: rcu_tasks_rude_ Not tainted 5.17.0-rc3-v8+ #13\n[ 0.386473] Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT)\n[ 0.387289] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 0.388308] pc : __flush_work+0x12c/0x138\n[ 0.388970] lr : __flush_work+0x80/0x138\n[ 0.389620] sp : ffffffc00aaf3c60\n[ 0.390139] x29: ffffffc00aaf3d20 x28: ffffffc009c16af0 x27: ffffff80f761df48\n[ 0.391316] x26: 0000000000000004 x25: 0000000000000003 x24: 0000000000000100\n[ 0.392493] x23: ffffffffffffffff x22: ffffffc009c16b10 x21: ffffffc009c16b28\n[ 0.393668] x20: ffffffc009e53861 x19: ffffff80f77fbf40 x18: 00000000d744fcc9\n[ 0.394842] x17: 000000000000000b x16: 00000000000001c2 x15: ffffffc009e57550\n[ 0.396016] x14: 0000000000000000 x13: ffffffffffffffff x12: 0000000100000000\n[ 0.397190] x11: 0000000000000462 x10: ffffff8040258008 x9 : 0000000100000000\n[ 0.398364] x8 : 0000000000000000 x7 : ffffffc0093c8bf4 x6 : 0000000000000000\n[ 0.399538] x5 : 0000000000000000 x4 : ffffffc00a976e40 x3 : ffffffc00810444c\n[ 0.400711] x2 : 0000000000000004 x1 : 0000000000000000 x0 : 0000000000000000\n[ 0.401886] Call trace:\n[ 0.402309] __flush_work+0x12c/0x138\n[ 0.402941] schedule_on_each_cpu+0x228/0x278\n[ 0.403693] rcu_tasks_rude_wait_gp+0x130/0x144\n[ 0.404502] rcu_tasks_kthread+0x220/0x254\n[ 0.405264] kthread+0x174/0x1ac\n[ 0.405837] ret_from_fork+0x10/0x20\n[ 0.406456] irq event stamp: 102\n[ 0.406966] hardirqs last enabled at (101): [] _raw_spin_unlock_irq+0x78/0xb4\n[ 0.408304] hardirqs last disabled at (102): [] el1_dbg+0x24/0x5c\n[ 0.409410] softirqs last enabled at (54): [] local_bh_enable+0xc/0x2c\n[ 0.410645] softirqs last disabled at (50): [] local_bh_disable+0xc/0x2c\n[ 0.411890] ---[ end trace 0000000000000000 ]---\n[ 0.413000] smp: Brought up 1 node, 4 CPUs\n[ 0.413762] SMP: Total of 4 processors activated.\n[ 0.414566] CPU features: detected: 32-bit EL0 Support\n[ 0.415414] CPU features: detected: 32-bit EL1 Support\n[ 0.416278] CPU features: detected: CRC32 instructions\n[ 0.447021] Callback from call_rcu_tasks_rude() invoked.\n[ 0.506693] Callback from call_rcu_tasks() invoked.\n\nThis commit therefore fixes this issue by applying a single-CPU\noptimization to the RCU Tasks Rude grace-period process. The key point\nhere is that the purpose of this RCU flavor is to force a schedule on\neach online CPU since some past event. But the rcu_tasks_rude_wait_gp()\nfunction runs in the context of the RCU Tasks Rude's grace-period kthread,\nso there must already have been a context switch on the current CPU since\nthe call to either synchronize_rcu_tasks_rude() or call_rcu_tasks_rude().\nSo if there is only a single CPU online, RCU Tasks Rude's grace-period\nkthread does not need to anything at all.\n\nIt turns out that the rcu_tasks_rude_wait_gp() function's call to\nschedule_on_each_cpu() causes problems during early boot. During that\ntime, there is only one online CPU, namely the boot CPU. Therefore,\napplying this single-CPU optimization fixes early-boot instances of\nthis problem."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rcu-tasks: corrige la ejecución en el trabajo de programación y vaciado. Al iniciar las CPU secundarias, cpus_read_[lock/unlock] no mantiene estable la máscara de CPU en línea. La máscara en línea transitoria da como resultado el siguiente seguimiento de llamadas. [ 0.324121] CPU1: Procesador secundario iniciado 0x0000000001 [0x410fd083] [ 0.346652] Caché PIPT I detectado en CPU2 [ 0.347212] CPU2: Procesador secundario iniciado 0x0000000002 [0x410fd083] [ 0.377255] Caché PIPT I detectado en CPU3 [ 0.377823] CPU3: Procesador secundario iniciado 0x0000000003 [0x410fd083] [ 0.379040] ------------[ cortar aquí ]------------ [ 0.383662] WARNING: CPU: 0 PID: 10 at kernel/workqueue.c:3084 __flush_work+0x12c/0x138 [ 0.384850] Modules linked in: [ 0.385403] CPU: 0 PID: 10 Comm: rcu_tasks_rude_ Not tainted 5.17.0-rc3-v8+ #13 [ 0.386473] Hardware name: Raspberry Pi 4 Model B Rev 1.4 (DT) [ 0.387289] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 0.388308] pc : __flush_work+0x12c/0x138 [ 0.388970] lr : __flush_work+0x80/0x138 [ 0.389620] sp : ffffffc00aaf3c60 [ 0.390139] x29: ffffffc00aaf3d20 x28: ffffffc009c16af0 x27: ffffff80f761df48 [ 0.391316] x26: 0000000000000004 x25: 0000000000000003 x24: 0000000000000100 [ 0.392493] x23: ffffffffffffffff x22: ffffffc009c16b10 x21: ffffffc009c16b28 [ 0.393668] x20: ffffffc009e53861 x19: ffffff80f77fbf40 x18: 00000000d744fcc9 [ 0.394842] x17: 000000000000000b x16: 00000000000001c2 x15: ffffffc009e57550 [ 0.396016] x14: 0000000000000000 x13: ffffffffffffffff x12: 0000000100000000 [ 0.397190] x11: 0000000000000462 x10: ffffff8040258008 x9 : 0000000100000000 [ 0.398364] x8 : 0000000000000000 x7 : ffffffc0093c8bf4 x6 : 0000000000000000 [ 0.399538] x5 : 0000000000000000 x4 : ffffffc00a976e40 x3 : ffffffc00810444c [ 0.400711] x2 : 0000000000000004 x1 : 0000000000000000 x0 : 0000000000000000 [ 0.401886] Call trace: [ 0.402309] __flush_work+0x12c/0x138 [ 0.402941] schedule_on_each_cpu+0x228/0x278 [ 0.403693] rcu_tasks_rude_wait_gp+0x130/0x144 [ 0.404502] rcu_tasks_kthread+0x220/0x254 [ 0.405264] kthread+0x174/0x1ac [ 0.405837] ret_from_fork+0x10/0x20 [ 0.406456] irq event stamp: 102 [ 0.406966] hardirqs last enabled at (101): [] _raw_spin_unlock_irq+0x78/0xb4 [ 0.408304] hardirqs last disabled at (102): [] el1_dbg+0x24/0x5c [ 0.409410] softirqs last enabled at (54): [] local_bh_enable+0xc/0x2c [ 0.410645] softirqs last disabled at (50): [] local_bh_disable+0xc/0x2c [ 0.411890] ---[ end trace 0000000000000000 ]--- [ 0.413000] smp: Brought up 1 node, 4 CPUs [ 0.413762] SMP: Total of 4 processors activated. [ 0.414566] CPU features: detected: 32-bit EL0 Support [ 0.415414] CPU features: detected: 32-bit EL1 Support [ 0.416278] CPU features: detected: CRC32 instructions [ 0.447021] Callback from call_rcu_tasks_rude() invoked. [ 0.506693] Callback from call_rcu_tasks() invoked. Por lo tanto, esta confirmación corrige este problema al aplicar una optimización de CPU única al proceso de período de gracia de RCU Tasks Rude. El punto clave aquí es que el propósito de esta variante de RCU es forzar una programación en cada CPU en línea desde algún evento pasado. Pero la función rcu_tasks_rude_wait_gp() se ejecuta en el contexto del kthread del período de gracia de RCU Tasks Rude, por lo que ya debe haber habido un cambio de contexto en la CPU actual desde la llamada asynchronous_rcu_tasks_rude() o call_rcu_tasks_rude(). Por lo tanto, si solo hay una CPU en línea, el kthread del período de gracia de RCU Tasks Rude no necesita hacer nada en absoluto. Resulta que la llamada de la función rcu_tasks_rude_wait_gp() a schedule_on_each_cpu() causa problemas durante el arranque temprano. Durante ese tiempo, solo hay una CPU en línea, es decir, la CPU de arranque. Por lo tanto, la aplicación de esta optimización de CPU única corrige las instancias de arranque temprano de este problema."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":4.7,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.0,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-362"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.121","matchCriteriaId":"814C88C6-C31D-462A-BBBE-BC83E102E84C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.46","matchCriteriaId":"20D41697-0E8B-4B7D-8842-F17BF2AA21E1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"5.17.14","matchCriteriaId":"15E2DD33-2255-4B76-9C15-04FF8CBAB252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"5.18.3","matchCriteriaId":"8E122216-2E9E-4B3E-B7B8-D575A45BA3C2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1c6c3f2336642fb3074593911f5176565f47ec41","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/230bf5878af6038dfb63d9184272a58475236580","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8f49a8758b5cd541bd7aa9a0d0d11c7426141c0e","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/ba722d061bc4b54802d701fc63fc2fd988934603","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f75fd4b9221d93177c50dcfde671b2e907f53e86","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]}]}}]}