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CVE-2026-80652

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

crypto: ccp - Treat zero-length cert chain as query for blob lengths

When handling a PDH export, treat a zero-length userspace cert chain buffer as a request to query the length of the relevant blobs. Failure to account for the zero-length buffer trips a BUG_ON() when running with CONFIG_DEBUG_VIRTUAL=y due to trying to get the physical address of the ZERO_SIZE_PTR (returned by kzalloc() on the bogus allocation).

Thankfully, the bug is benign outside of CONFIG_DEBUG_VIRTUAL=y as getting the physical address is just arithmetic, and the PSP errors out before trying to write to the garbage address (which it must, otherwise querying the blob lengths would clobber memory at pfn=0).

Detalles técnicos trazas, registros y código del informe original
   kernel BUG at arch/x86/mm/physaddr.c:28 !
  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
  CPU: 30 UID: 0 PID: 28580 Comm: syz.2.18 Kdump: loaded
  Tainted: G        W           6.18.16-smp-DEV #1 NONE
  Tainted: [W]=WARN
  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025
   RIP: 0010:__phys_addr+0x16a/0x180 arch/x86/mm/physaddr.c:28
  RSP: 0018:ffffc9008329fc80 EFLAGS: 00010293
  RAX: ffffffff8179110a RBX: 0000778000000010 RCX: ffff8884e6992600
  RDX: 0000000000000000 RSI: 0000000080000010 RDI: 0000778000000010
  RBP: ffffc9008329fdf0 R08: 0000000000000dc0 R09: 00000000ffffffff
  R10: dffffc0000000000 R11: fffffbfff126d297 R12: dffffc0000000000
  R13: 1ffff92010653fc8 R14: 0000000080000010 R15: dffffc0000000000
  FS:  0000555556bec9c0(0000) GS:ffff88aa4ce1c000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007fd3159e7000 CR3: 00000004fbc44000 CR4: 0000000000350ef0
  Call Trace:
   <TASK>
    [<ffffffff853d3869>] sev_ioctl_do_pdh_export+0x559/0x7a0 drivers/crypto/ccp/sev-dev.c:2308
    [<ffffffff853d1fdd>] sev_ioctl+0x2cd/0x480 drivers/crypto/ccp/sev-dev.c:2556
    [<ffffffff82549ebc>] vfs_ioctl fs/ioctl.c:52 [inline]
    [<ffffffff82549ebc>] __do_sys_ioctl fs/ioctl.c:598 [inline]
    [<ffffffff82549ebc>] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
    [<ffffffff8630115f>] do_syscall_x64 arch/x86/entry/syscall_64.c:64 [inline]
    [<ffffffff8630115f>] do_syscall_64+0x9f/0xf40 arch/x86/entry/syscall_64.c:98
   [<ffffffff81000136>] entry_SYSCALL_64_after_hwframe+0x76/0x7e
  RIP: 0033:0x7fd3158eac39
   </TASK>

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-80652",
  "cveTags": [],
  "metrics": {},
  "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": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "1c587f30c6242cc37b3d6ee6d91daef84e51633f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "13b4d5e055d344e34b864bced0a591ceaac7ad81",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "94344bc7c9d70b04be718d841b92873aa3ea8191",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "50c3c7df4f26d36b30bc950a7d780f7029fd52f8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "ee717e73ab47253c82c134c342e32fcdfcfccd87",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "21650fe221ea9b72809140b691589dde8bff3eab",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "d88071a6ce091272726bedda26c105b85b23705f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "76a2b524a4b1d6dc0f2421f9854a01d55d5e5436",
              "lessThan": "ef8c9dacda2871accd64e3eda951fef6b788b1ea",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-28T08:16:50.200",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/13b4d5e055d344e34b864bced0a591ceaac7ad81",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1c587f30c6242cc37b3d6ee6d91daef84e51633f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/21650fe221ea9b72809140b691589dde8bff3eab",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/50c3c7df4f26d36b30bc950a7d780f7029fd52f8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/94344bc7c9d70b04be718d841b92873aa3ea8191",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d88071a6ce091272726bedda26c105b85b23705f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee717e73ab47253c82c134c342e32fcdfcfccd87",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ef8c9dacda2871accd64e3eda951fef6b788b1ea",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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   <TASK>\n    [<ffffffff853d3869>] sev_ioctl_do_pdh_export+0x559/0x7a0 drivers/crypto/ccp/sev-dev.c:2308\n    [<ffffffff853d1fdd>] sev_ioctl+0x2cd/0x480 drivers/crypto/ccp/sev-dev.c:2556\n    [<ffffffff82549ebc>] vfs_ioctl fs/ioctl.c:52 [inline]\n    [<ffffffff82549ebc>] __do_sys_ioctl fs/ioctl.c:598 [inline]\n    [<ffffffff82549ebc>] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584\n    [<ffffffff8630115f>] do_syscall_x64 arch/x86/entry/syscall_64.c:64 [inline]\n    [<ffffffff8630115f>] do_syscall_64+0x9f/0xf40 arch/x86/entry/syscall_64.c:98\n   [<ffffffff81000136>] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  RIP: 0033:0x7fd3158eac39\n   </TASK>\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)."
    }
  ],
  "lastModified": "2026-08-28T08:16:50.200",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}