{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-46951", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-46951", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-02-27T18:40:34.757Z", "updatedAt": "2026-05-11T13:45:04.916Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "tpm: efi: Use local variable for calculating final log size", "summary": "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 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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "166a2809d65b282272c474835ec22c882a39ca1b", "status": "affected", "versionType": "git", "lessThan": "2f12258b5224cfaa808c54fd29345f3c1cbfca76" }, { "version": "166a2809d65b282272c474835ec22c882a39ca1b", "status": "affected", "versionType": "git", "lessThan": "60a01ecc9f68067e4314a0b55148e39e5d58a51b" }, { "version": "166a2809d65b282272c474835ec22c882a39ca1b", "status": "affected", "versionType": "git", "lessThan": "3818b753277f5ca0c170bf5b98e0a5a225542fcb" }, { "version": "166a2809d65b282272c474835ec22c882a39ca1b", "status": "affected", "versionType": "git", "lessThan": "ac07c557ca12ec9276c0375517bac7ae5be4e50c" }, { "version": "166a2809d65b282272c474835ec22c882a39ca1b", "status": "affected", "versionType": "git", "lessThan": "48cff270b037022e37835d93361646205ca25101" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.3", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.3" }, { "version": "5.4.118", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.36", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.11.20", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.11.*" }, { "version": "5.12.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.12.*" }, { "version": "5.13", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }