CVE-2021-47219

{"id": "CVE-2021-47219", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47219", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-10T19:49:13.779675Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "8440377e1a5644779b4c8d013aa2a917f5fc83c3", "versionType": "git"}, {"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "66523553fa62c7878fc5441dc4e82be71934eb77", "versionType": "git"}, {"status": "affected", "version": "5a09e39810ae0465016c380962e12dd115779b87", "lessThan": "f347c26836c270199de1599c3cd466bb7747caa9", "versionType": "git"}], "programFiles": ["drivers/scsi/scsi_debug.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.82", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.5", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/scsi/scsi_debug.c"], "defaultStatus": "affected"}]}], "published": "2024-04-10T19:15:48.903", "references": [{"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77", "tags": ["Mailing List", "Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3", "tags": ["Mailing List", "Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9", "tags": ["Mailing List", "Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/66523553fa62c7878fc5441dc4e82be71934eb77", "tags": ["Mailing List", "Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/8440377e1a5644779b4c8d013aa2a917f5fc83c3", "tags": ["Mailing List", "Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/f347c26836c270199de1599c3cd466bb7747caa9", "tags": ["Mailing List", "Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "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_report_tgtpgs()\n\nThe following issue was observed running syzkaller:\n\nBUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline]\nBUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\nRead of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815\n\nCPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0xe4/0x14a lib/dump_stack.c:118\n print_address_description+0x73/0x280 mm/kasan/report.c:253\n kasan_report_error mm/kasan/report.c:352 [inline]\n kasan_report+0x272/0x370 mm/kasan/report.c:410\n memcpy+0x1f/0x50 mm/kasan/kasan.c:302\n memcpy include/linux/string.h:377 [inline]\n sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831\n fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021\n resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772\n schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429\n scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835\n scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896\n scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034\n __blk_run_queue_uncond block/blk-core.c:464 [inline]\n __blk_run_queue+0x1a4/0x380 block/blk-core.c:484\n blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78\n sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847\n sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716\n sg_write+0x64/0xa0 drivers/scsi/sg.c:622\n __vfs_write+0xed/0x690 fs/read_write.c:485\nkill_bdev:block_device:00000000e138492c\n vfs_write+0x184/0x4c0 fs/read_write.c:549\n ksys_write+0x107/0x240 fs/read_write.c:599\n do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293\n entry_SYSCALL_64_after_hwframe+0x49/0xbe\n\nWe get 'alen' from command its type is int. If userspace passes a large\nlength we will get a negative 'alen'.\n\nSwitch n, alen, and rlen to u32."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: scsi_debug: Corregir lectura fuera de los l\u00edmites en resp_report_tgtpgs() Se observ\u00f3 el siguiente problema al ejecutar syzkaller: ERROR: KASAN: slab-out-of-bounds en memcpy include/linux/string.h:377 [en l\u00ednea] ERROR: KASAN: slab-out-of-bounds en sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831 Lectura de tama\u00f1o 2132 en la direcci\u00f3n ffff8880aea95dc8 por la tarea syz-executor.0/9815 CPU: 0 PID: 9815 Comm: syz-executor.0 No contaminado 4.19.202-00874-gfc0fe04215a9 #2 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 01/04/2014 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:77 [en l\u00ednea] dump_stack+0xe4/0x14a lib/dump_stack.c:118 print_address_description+0x73/0x280 mm/kasan/report.c:253 kasan_report_error mm/kasan/report.c:352 [en l\u00ednea] kasan_report+0x272/0x370 mm/kasan/report.c:410 memcpy+0x1f/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:377 [en l\u00ednea] sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831 rellenar_desde_buffer_dev+0x14f/0x340 drivers/scsi/scsi_debug.c:1021 resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772 schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429 scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835 scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896 scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034 __blk_run_queue_uncond bloque/blk-core.c:464 [en l\u00ednea] __blk_run_queue+0x1a4/0x380 bloque/blk-core.c:484 blk_execute_rq_nowait+0x1c2/0x2d0 bloque/blk-exec.c:78 sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847 sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716 sg_write+0x64/0xa0 drivers/scsi/sg.c:622 __vfs_write+0xed/0x690 fs/read_write.c:485 kill_bdev:block_device:00000000e138492c vfs_write+0x184/0x4c0 fs/read_write.c:549 ksys_write+0x107/0x240 fs/read_write.c:599 do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Obtenemos 'alen' del comando, su tipo es int. Si el espacio de usuario pasa una longitud grande, obtendremos un 'alen' negativo. Cambie n, alen y rlen a u32."}], "lastModified": "2026-06-17T04:16:56.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "49103CD7-A3F7-441A-AAF4-11B8B707979D", "versionEndExcluding": "5.10.82"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2128A085-4C0C-4C1E-9E9C-0DD868E2170F", "versionEndExcluding": "5.15.5", "versionStartIncluding": "5.11"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}