{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80652", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.779Z", "datePublished": "2026-08-28T06:49:00.093Z", "dateUpdated": "2026-08-28T06:49:00.093Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-28T06:49:00.093Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Treat zero-length cert chain as query for blob lengths\n\nWhen handling a PDH export, treat a zero-length userspace cert chain buffer\nas a request to query the length of the relevant blobs. Failure to account\nfor the zero-length buffer trips a BUG_ON() when running with\nCONFIG_DEBUG_VIRTUAL=y due to trying to get the physical address of the\nZERO_SIZE_PTR (returned by kzalloc() on the bogus allocation).\n\n kernel BUG at arch/x86/mm/physaddr.c:28 !\n Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n CPU: 30 UID: 0 PID: 28580 Comm: syz.2.18 Kdump: loaded\n Tainted: G W 6.18.16-smp-DEV #1 NONE\n Tainted: [W]=WARN\n Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n RIP: 0010:__phys_addr+0x16a/0x180 arch/x86/mm/physaddr.c:28\n RSP: 0018:ffffc9008329fc80 EFLAGS: 00010293\n RAX: ffffffff8179110a RBX: 0000778000000010 RCX: ffff8884e6992600\n RDX: 0000000000000000 RSI: 0000000080000010 RDI: 0000778000000010\n RBP: ffffc9008329fdf0 R08: 0000000000000dc0 R09: 00000000ffffffff\n R10: dffffc0000000000 R11: fffffbfff126d297 R12: dffffc0000000000\n R13: 1ffff92010653fc8 R14: 0000000080000010 R15: dffffc0000000000\n FS: 0000555556bec9c0(0000) GS:ffff88aa4ce1c000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fd3159e7000 CR3: 00000004fbc44000 CR4: 0000000000350ef0\n Call Trace:\n \n [] sev_ioctl_do_pdh_export+0x559/0x7a0 drivers/crypto/ccp/sev-dev.c:2308\n [] sev_ioctl+0x2cd/0x480 drivers/crypto/ccp/sev-dev.c:2556\n [] vfs_ioctl fs/ioctl.c:52 [inline]\n [] __do_sys_ioctl fs/ioctl.c:598 [inline]\n [] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584\n [] do_syscall_x64 arch/x86/entry/syscall_64.c:64 [inline]\n [] do_syscall_64+0x9f/0xf40 arch/x86/entry/syscall_64.c:98\n [] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7fd3158eac39\n \n\nThankfully, the bug is benign outside of CONFIG_DEBUG_VIRTUAL=y as getting\nthe physical address is just arithmetic, and the PSP errors out before\ntrying to write to the garbage address (which it must, otherwise querying\nthe blob lengths would clobber memory at pfn=0)." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/crypto/ccp/sev-dev.c" ], "versions": [ { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "1c587f30c6242cc37b3d6ee6d91daef84e51633f", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "13b4d5e055d344e34b864bced0a591ceaac7ad81", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "94344bc7c9d70b04be718d841b92873aa3ea8191", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "50c3c7df4f26d36b30bc950a7d780f7029fd52f8", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "ee717e73ab47253c82c134c342e32fcdfcfccd87", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "21650fe221ea9b72809140b691589dde8bff3eab", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "d88071a6ce091272726bedda26c105b85b23705f", "status": "affected", "versionType": "git" }, { "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436", "lessThan": "ef8c9dacda2871accd64e3eda951fef6b788b1ea", "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/crypto/ccp/sev-dev.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1c587f30c6242cc37b3d6ee6d91daef84e51633f" }, { "url": "https://git.kernel.org/stable/c/13b4d5e055d344e34b864bced0a591ceaac7ad81" }, { "url": "https://git.kernel.org/stable/c/94344bc7c9d70b04be718d841b92873aa3ea8191" }, { "url": "https://git.kernel.org/stable/c/50c3c7df4f26d36b30bc950a7d780f7029fd52f8" }, { "url": "https://git.kernel.org/stable/c/ee717e73ab47253c82c134c342e32fcdfcfccd87" }, { "url": "https://git.kernel.org/stable/c/21650fe221ea9b72809140b691589dde8bff3eab" }, { "url": "https://git.kernel.org/stable/c/d88071a6ce091272726bedda26c105b85b23705f" }, { "url": "https://git.kernel.org/stable/c/ef8c9dacda2871accd64e3eda951fef6b788b1ea" } ], "title": "crypto: ccp - Treat zero-length cert chain as query for blob lengths", "x_generator": { "engine": "bippy-1.2.0" } } } }