CVE-2021-46951

{"id": "CVE-2021-46951", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-02-27T19:04:06.470", "references": [{"url": "https://git.kernel.org/stable/c/2f12258b5224cfaa808c54fd29345f3c1cbfca76", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3818b753277f5ca0c170bf5b98e0a5a225542fcb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/48cff270b037022e37835d93361646205ca25101", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/60a01ecc9f68067e4314a0b55148e39e5d58a51b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ac07c557ca12ec9276c0375517bac7ae5be4e50c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-191"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: efi: Use local variable for calculating final log size\n\nWhen tpm_read_log_efi is called multiple times, which happens when\none loads and unloads a TPM2 driver multiple times, then the global\nvariable efi_tpm_final_log_size will at some point become a negative\nnumber due to the subtraction of final_events_preboot_size occurring\neach time. Use a local variable to avoid this integer underflow.\n\nThe following issue is now resolved:\n\nMar 8 15:35:12 hibinst kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\nMar 8 15:35:12 hibinst kernel: Workqueue: tpm-vtpm vtpm_proxy_work [tpm_vtpm_proxy]\nMar 8 15:35:12 hibinst kernel: RIP: 0010:__memcpy+0x12/0x20\nMar 8 15:35:12 hibinst kernel: Code: 00 b8 01 00 00 00 85 d2 74 0a c7 05 44 7b ef 00 0f 00 00 00 c3 cc cc cc 66 66 90 66 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4\nMar 8 15:35:12 hibinst kernel: RSP: 0018:ffff9ac4c0fcfde0 EFLAGS: 00010206\nMar 8 15:35:12 hibinst kernel: RAX: ffff88f878cefed5 RBX: ffff88f878ce9000 RCX: 1ffffffffffffe0f\nMar 8 15:35:12 hibinst kernel: RDX: 0000000000000003 RSI: ffff9ac4c003bff9 RDI: ffff88f878cf0e4d\nMar 8 15:35:12 hibinst kernel: RBP: ffff9ac4c003b000 R08: 0000000000001000 R09: 000000007e9d6073\nMar 8 15:35:12 hibinst kernel: R10: ffff9ac4c003b000 R11: ffff88f879ad3500 R12: 0000000000000ed5\nMar 8 15:35:12 hibinst kernel: R13: ffff88f878ce9760 R14: 0000000000000002 R15: ffff88f77de7f018\nMar 8 15:35:12 hibinst kernel: FS: 0000000000000000(0000) GS:ffff88f87bd00000(0000) knlGS:0000000000000000\nMar 8 15:35:12 hibinst kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nMar 8 15:35:12 hibinst kernel: CR2: ffff9ac4c003c000 CR3: 00000001785a6004 CR4: 0000000000060ee0\nMar 8 15:35:12 hibinst kernel: Call Trace:\nMar 8 15:35:12 hibinst kernel: tpm_read_log_efi+0x152/0x1a7\nMar 8 15:35:12 hibinst kernel: tpm_bios_log_setup+0xc8/0x1c0\nMar 8 15:35:12 hibinst kernel: tpm_chip_register+0x8f/0x260\nMar 8 15:35:12 hibinst kernel: vtpm_proxy_work+0x16/0x60 [tpm_vtpm_proxy]\nMar 8 15:35:12 hibinst kernel: process_one_work+0x1b4/0x370\nMar 8 15:35:12 hibinst kernel: worker_thread+0x53/0x3e0\nMar 8 15:35:12 hibinst kernel: ? process_one_work+0x370/0x370"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tpm: efi: use la variable local para calcular el tama\u00f1o del registro final Cuando se llama a tpm_read_log_efi varias veces, lo que sucede cuando uno carga y descarga un controlador TPM2 varias veces, entonces la variable global efi_tpm_final_log_size en alg\u00fan momento se convierte en un n\u00famero negativo debido a la resta de final_events_preboot_size que ocurre cada vez. Utilice una variable local para evitar este desbordamiento de enteros. El siguiente problema ahora est\u00e1 resuelto: 8 de marzo 15:35:12 kernel hibinst: Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 0.0.0 06/02/2015 8 de marzo 15:35:12 kernel hibinst: Cola de trabajo: tpm-vtpm vtpm_proxy_work [tpm_vtpm_proxy] 8 de marzo 15:35:12 kernel de hibinst: RIP: 0010:__memcpy+0x12/0x20 8 de marzo 15:35:12 kernel de hibinst: C\u00f3digo: 00 b8 01 00 00 00 85 d2 74 0a c7 05 44 7b ef 00 0f 00 00 00 c3 cc cc cc 66 66 90 66 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 8 de marzo 15:35:12 kernel de hibinst: RSP: 0018:ffff9ac4c0fcfde0 EFLAGS: 00010206 8 de marzo 15:35:12 kernel de hibinst: RAX: ffff88f878cefed5 RBX: ffff88f878ce9000 RCX: 1ff ffffffffffe0f 8 de marzo 15:35:12 kernel de hibinst: RDX: 0000000000000003 RSI: ffff9ac4c003bff9 RDI: ffff88f878cf0e4d 8 de marzo 15:35:12 kernel de hibinst: RBP: ffff9ac4c003b000 R08: 0000000000001000 R09: 000 000007e9d6073 8 de marzo 15:35:12 kernel hibinst: R10: ffff9ac4c003b000 R11: ffff88f879ad3500 R12: 0000000000000ed5 8 de marzo 15:35:12 kernel de hibinst: R13: ffff88f878ce9760 R14: 0000000000000002 R15: ffff88f77de7f018 8 de marzo 15:35:12 kernel de hibinst: FS: 0000000000000000(0000) GS:ffff8 8f87bd00000(0000) knlGS:0000000000000000 8 de marzo a las 15:35: 12 kernel de hibinst: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 8 de marzo 15:35:12 kernel de hibinst: CR2: ffff9ac4c003c000 CR3: 00000001785a6004 CR4: 0000000000060ee0 8 de marzo 15:35:12 kernel de hibinst: Seguimiento de llamadas: 8 de marzo 15:35:12 Hibinst Kernel: tpm_read_log_efi+0x152/0x1a7 mar 8 15:35:12 hibinst kernel: tpm_bios_log_setup+0xc8/0x1c0 mar 8 15:35:12 hibinst kernel: tpm_chip_register kernel de hibinst: vtpm_proxy_work+0x16/0x60 [tpm_vtpm_proxy] 8 de marzo 15:35:12 kernel de hibinst: Process_one_work+0x1b4/0x370 8 de marzo 15:35:12 kernel de hibinst: work_thread+0x53/0x3e0 8 de marzo 15:35:12 kernel de hibinst : ? proceso_un_trabajo+0x370/0x370"}], "lastModified": "2024-04-10T20:15:55.593", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2F9A2C0-AF4B-4AEB-8B7D-1654AAE2376E", "versionEndExcluding": "5.4.118", "versionStartIncluding": "5.3.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C7148769-B830-4B8F-986F-E0C85A19FC7F", "versionEndExcluding": "5.10.36", "versionStartIncluding": "5.5.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EFB425F0-C28C-4B44-8B4C-AD512AA832DE", "versionEndExcluding": "5.11.20", "versionStartIncluding": "5.11.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C3814FA3-8141-4313-A852-8C4212BE12AD", "versionEndExcluding": "5.12.3", "versionStartIncluding": "5.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}