{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "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"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/char/tpm/eventlog/efi.c"
               ],
               "versions": [
                  {
                     "version": "166a2809d65b",
                     "lessThan": "2f12258b5224",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "166a2809d65b",
                     "lessThan": "60a01ecc9f68",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "166a2809d65b",
                     "lessThan": "3818b753277f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "166a2809d65b",
                     "lessThan": "ac07c557ca12",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "166a2809d65b",
                     "lessThan": "48cff270b037",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/char/tpm/eventlog/efi.c"
               ],
               "versions": [
                  {
                     "version": "5.3",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.3",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.118",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.36",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.11.20",
                     "lessThanOrEqual": "5.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12.3",
                     "lessThanOrEqual": "5.12.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.13",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/2f12258b5224cfaa808c54fd29345f3c1cbfca76"
            },
            {
               "url": "https://git.kernel.org/stable/c/60a01ecc9f68067e4314a0b55148e39e5d58a51b"
            },
            {
               "url": "https://git.kernel.org/stable/c/3818b753277f5ca0c170bf5b98e0a5a225542fcb"
            },
            {
               "url": "https://git.kernel.org/stable/c/ac07c557ca12ec9276c0375517bac7ae5be4e50c"
            },
            {
               "url": "https://git.kernel.org/stable/c/48cff270b037022e37835d93361646205ca25101"
            }
         ],
         "title": "tpm: efi: Use local variable for calculating final log size",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46951",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}