{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-14T19:03:47.684","vulnerabilities":[{"cve":{"id":"CVE-2021-47191","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-04-10T19:15:47.663","lastModified":"2025-01-14T16:40:59.737","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix out-of-bound read in resp_readcap16()\n\nThe following warning was observed running syzkaller:\n\n[ 3813.830724] sg_write: data in\/out 65466\/242 bytes for SCSI command 0x9e-- guessing data in;\n[ 3813.830724]    program syz-executor not setting count and\/or reply_len properly\n[ 3813.836956] ==================================================================\n[ 3813.839465] BUG: KASAN: stack-out-of-bounds in sg_copy_buffer+0x157\/0x1e0\n[ 3813.841773] Read of size 4096 at addr ffff8883cf80f540 by task syz-executor\/1549\n[ 3813.846612] Call Trace:\n[ 3813.846995]  dump_stack+0x108\/0x15f\n[ 3813.847524]  print_address_description+0xa5\/0x372\n[ 3813.848243]  kasan_report.cold+0x236\/0x2a8\n[ 3813.849439]  check_memory_region+0x240\/0x270\n[ 3813.850094]  memcpy+0x30\/0x80\n[ 3813.850553]  sg_copy_buffer+0x157\/0x1e0\n[ 3813.853032]  sg_copy_from_buffer+0x13\/0x20\n[ 3813.853660]  fill_from_dev_buffer+0x135\/0x370\n[ 3813.854329]  resp_readcap16+0x1ac\/0x280\n[ 3813.856917]  schedule_resp+0x41f\/0x1630\n[ 3813.858203]  scsi_debug_queuecommand+0xb32\/0x17e0\n[ 3813.862699]  scsi_dispatch_cmd+0x330\/0x950\n[ 3813.863329]  scsi_request_fn+0xd8e\/0x1710\n[ 3813.863946]  __blk_run_queue+0x10b\/0x230\n[ 3813.864544]  blk_execute_rq_nowait+0x1d8\/0x400\n[ 3813.865220]  sg_common_write.isra.0+0xe61\/0x2420\n[ 3813.871637]  sg_write+0x6c8\/0xef0\n[ 3813.878853]  __vfs_write+0xe4\/0x800\n[ 3813.883487]  vfs_write+0x17b\/0x530\n[ 3813.884008]  ksys_write+0x103\/0x270\n[ 3813.886268]  __x64_sys_write+0x77\/0xc0\n[ 3813.886841]  do_syscall_64+0x106\/0x360\n[ 3813.887415]  entry_SYSCALL_64_after_hwframe+0x44\/0xa9\n\nThis issue can be reproduced with the following syzkaller log:\n\nr0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='.\/file0\\x00', 0x26e1, 0x0)\nr1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fd\/3\\x00')\nopen_by_handle_at(r1, &(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000)\nr2 = syz_open_dev$sg(&(0x7f0000000000), 0x0, 0x40782)\nwrite$binfmt_aout(r2, &(0x7f0000000340)=ANY=[@ANYBLOB=\"00000000deff000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d\"], 0x126)\n\nIn resp_readcap16() we get \"int alloc_len\" value -1104926854, and then pass\nthe huge arr_len to fill_from_dev_buffer(), but arr is only 32 bytes. This\nleads to OOB in sg_copy_buffer().\n\nTo solve this issue, define alloc_len as u32."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: scsi_debug: Se corrige la lectura fuera de los límites en resp_readcap16(). Se observó la siguiente advertencia al ejecutar syzkaller: [ 3813.830724] sg_write: datos de entrada\/salida 65466\/242 bytes para el comando SCSI 0x9e-- adivinando datos de entrada; [ 3813.830724] El programa syz-executor no establece count y\/o reply_len correctamente [ 3813.836956] ====================================================================== [ 3813.839465] ERROR: KASAN: pila fuera de los límites en sg_copy_buffer+0x157\/0x1e0 [ 3813.841773] Lectura de tamaño 4096 en la dirección ffff8883cf80f540 por la tarea syz-executor\/1549 [ 3813.846612] Seguimiento de llamadas: [ 3813.846995] dump_stack+0x108\/0x15f [ 3813.847524] print_address_description+0xa5\/0x372 [ 3813.848243] kasan_report.cold+0x236\/0x2a8 [ 3813.849439] check_memory_region+0x240\/0x270 [ 3813.850094] memcpy+0x30\/0x80 [ 3813.850553] sg_copy_buffer+0x157\/0x1e0 [ 3813.853032] sg_copy_from_buffer+0x13\/0x20 [ 3813.853660] llenar_desde_buffer_dev+0x135\/0x370 [ 3813.854329] resp_readcap16+0x1ac\/0x280 [ 3813.856917] schedule_resp+0x41f\/0x1630 [ 3813.858203] comando_cola_de_depuración_scsi+0xb32\/0x17e0 [ 3813.862699] comando_envío_scsi+0x330\/0x950 [ 3813.863329] función_solicitud_scsi+0xd8e\/0x1710 [ 3813.863946] cola_ejecución_blk+0x10b\/0x230 [ 3813.864544] blk_execute_rq_nowait+0x1d8\/0x400 [ 3813.865220] sg_common_write.isra.0+0xe61\/0x2420 [ 3813.871637] sg_write+0x6c8\/0xef0 [ 3813.878853] __vfs_write+0xe4\/0x800 [ 3813.883487] vfs_write+0x17b\/0x530 [ 3813.884008] ksys_write+0x103\/0x270 [ 3813.886268] __x64_sys_write+0x77\/0xc0 [ 3813.886841] do_syscall_64+0x106\/0x360 [ 3813.887415] entry_SYSCALL_64_after_hwframe+0x44\/0xa9 Este problema se puede reproducir con el siguiente registro de syzkaller: r0 = openat(0xffffffffffffff9c, &(0x7f0000000040)='.\/file0\\x00', 0x26e1, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fd\/3\\x00') open_by_handle_at(r1, &(0x7f00000003c0)=ANY=[@ANYRESHEX], 0x602000) r2 = syz_open_dev$sg(&(0x7f0000000000), 0x0, 0x40782) escribir$binfmt_aout(r2, &(0x7f0000000340)=ANY=[@ANYBLOB=\"00000000deff000000000000000000000000000000000000000000000000000000000000047f007af9e107a41ec395f1bded7be24277a1501ff6196a83366f4e6362bc0ff2b247f68a972989b094b2da4fb3607fcf611a22dd04310d28c75039d\"], 0x126) En resp_readcap16() obtenemos el valor \"int alloc_len\" -1104926854, y luego pasamos la enorme arr_len se usa para fill_from_dev_buffer(), pero arr solo tiene 32 bytes. Esto genera OOB en sg_copy_buffer(). Para resolver este problema, defina alloc_len como u32."}],"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:H\/I:N\/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-125"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.82","matchCriteriaId":"49103CD7-A3F7-441A-AAF4-11B8B707979D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.5","matchCriteriaId":"2128A085-4C0C-4C1E-9E9C-0DD868E2170F"}]}]}],"references":[{"url":"https:\/\/git.kernel.org\/stable\/c\/3e20cb072679bdb47747ccc8bee3233a4cf0765a","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/4e3ace0051e7e504b55d239daab8789dd89b863c","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/5b8bed6464ad6653586e30df046185fd816ad999","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/3e20cb072679bdb47747ccc8bee3233a4cf0765a","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/4e3ace0051e7e504b55d239daab8789dd89b863c","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/5b8bed6464ad6653586e30df046185fd816ad999","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}