Vulnerability-Lookup

FKIE_CVE-2025-40102

Vulnerability from fkie_nvd - Published: 2025-10-30 10:15 - Updated: 2026-10-19 21:10

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Prevent access to vCPU events before init Another day, another syzkaller bug. KVM erroneously allows userspace to pend vCPU events for a vCPU that hasn't been initialized yet, leading to KVM interpreting a bunch of uninitialized garbage for routing / injecting the exception. In one case the injection code and the hyp disagree on whether the vCPU has a 32bit EL1 and put the vCPU into an illegal mode for AArch64, tripping the BUG() in exception_target_el() during the next injection: kernel BUG at arch/arm64/kvm/inject_fault.c:40! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : exception_target_el+0x88/0x8c lr : pend_serror_exception+0x18/0x13c sp : ffff800082f03a10 x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000 x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000 x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004 x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20 Call trace: exception_target_el+0x88/0x8c (P) kvm_inject_serror_esr+0x40/0x3b4 __kvm_arm_vcpu_set_events+0xf0/0x100 kvm_arch_vcpu_ioctl+0x180/0x9d4 kvm_vcpu_ioctl+0x60c/0x9f4 __arm64_sys_ioctl+0xac/0x104 invoke_syscall+0x48/0x110 el0_svc_common.constprop.0+0x40/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x34/0xf0 el0t_64_sync_handler+0xa0/0xe4 el0t_64_sync+0x198/0x19c Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000) Reject the ioctls outright as no sane VMM would call these before KVM_ARM_VCPU_INIT anyway. Even if it did the exception would've been thrown away by the eventual reset of the vCPU's state.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0aa1b76fe1429629215a7c79820e4b96233ac4a3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64a04e6320fc5affbadc59dc7024d79f909bfe84
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7b854e68365a84dfa984ee81268e10b9311ac9d2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b0ab34a9e4cd5b88b522cc156e792cefe3085334
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b498f0da45a388b40195f7198455c62fe366a372
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d64461d38972302f0243498ff409b0d54e14e106

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/arm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b0ab34a9e4cd5b88b522cc156e792cefe3085334",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "d64461d38972302f0243498ff409b0d54e14e106",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "b498f0da45a388b40195f7198455c62fe366a372",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "7b854e68365a84dfa984ee81268e10b9311ac9d2",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "64a04e6320fc5affbadc59dc7024d79f909bfe84",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "0aa1b76fe1429629215a7c79820e4b96233ac4a3",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/arm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Prevent access to vCPU events before init\n\nAnother day, another syzkaller bug. KVM erroneously allows userspace to\npend vCPU events for a vCPU that hasn\u0027t been initialized yet, leading to\nKVM interpreting a bunch of uninitialized garbage for routing /\ninjecting the exception.\n\nIn one case the injection code and the hyp disagree on whether the vCPU\nhas a 32bit EL1 and put the vCPU into an illegal mode for AArch64,\ntripping the BUG() in exception_target_el() during the next injection:\n\n  kernel BUG at arch/arm64/kvm/inject_fault.c:40!\n  Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n  CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : exception_target_el+0x88/0x8c\n  lr : pend_serror_exception+0x18/0x13c\n  sp : ffff800082f03a10\n  x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000\n  x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000\n  x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004\n  x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000\n  x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0\n  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n  x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n  x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000\n  x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000\n  x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20\n  Call trace:\n   exception_target_el+0x88/0x8c (P)\n   kvm_inject_serror_esr+0x40/0x3b4\n   __kvm_arm_vcpu_set_events+0xf0/0x100\n   kvm_arch_vcpu_ioctl+0x180/0x9d4\n   kvm_vcpu_ioctl+0x60c/0x9f4\n   __arm64_sys_ioctl+0xac/0x104\n   invoke_syscall+0x48/0x110\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x34/0xf0\n   el0t_64_sync_handler+0xa0/0xe4\n   el0t_64_sync+0x198/0x19c\n  Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000)\n\nReject the ioctls outright as no sane VMM would call these before\nKVM_ARM_VCPU_INIT anyway. Even if it did the exception would\u0027ve been\nthrown away by the eventual reset of the vCPU\u0027s state."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nKVM: arm64: Prevenir el acceso a eventos de vCPU antes de la inicializaci\u00f3n\n\nOtro d\u00eda, otro error de syzkaller. KVM permite err\u00f3neamente que el espacio de usuario ponga en espera eventos de vCPU para una vCPU que a\u00fan no ha sido inicializada, lo que lleva a que KVM interprete un mont\u00f3n de basura no inicializada para enrutar / inyectar la excepci\u00f3n.\n\nEn un caso, el c\u00f3digo de inyecci\u00f3n y el hyp no est\u00e1n de acuerdo sobre si la vCPU tiene un EL1 de 32 bits y ponen la vCPU en un modo ilegal para AArch64, activando el BUG() en exception_target_el() durante la siguiente inyecci\u00f3n:\n\n  BUG del kernel en arch/arm64/kvm/inject_fault.c:40!\n  Error interno: Oops - BUG: 00000000f2000800 [#1]  SMP\n  CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : exception_target_el+0x88/0x8c\n  lr : pend_serror_exception+0x18/0x13c\n  sp : ffff800082f03a10\n  x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000\n  x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000\n  x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004\n  x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000\n  x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0\n  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n  x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n  x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000\n  x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000\n  x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20\n  Call trace:\n   exception_target_el+0x88/0x8c (P)\n   kvm_inject_serror_esr+0x40/0x3b4\n   __kvm_arm_vcpu_set_events+0xf0/0x100\n   kvm_arch_vcpu_ioctl+0x180/0x9d4\n   kvm_vcpu_ioctl+0x60c/0x9f4\n   __arm64_sys_ioctl+0xac/0x104\n   invoke_syscall+0x48/0x110\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x34/0xf0\n   el0t_64_sync_handler+0xa0/0xe4\n   el0t_64_sync+0x198/0x19c\n  Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000)\n\nRechazar los ioctls directamente, ya que ning\u00fan VMM sensato los llamar\u00eda antes de KVM_ARM_VCPU_INIT de todos modos. Incluso si lo hiciera, la excepci\u00f3n habr\u00eda sido descartada por el eventual reinicio del estado de la vCPU."
    }
  ],
  "id": "CVE-2025-40102",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {},
  "published": "2025-10-30T10:15:34.603",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0aa1b76fe1429629215a7c79820e4b96233ac4a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64a04e6320fc5affbadc59dc7024d79f909bfe84"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7b854e68365a84dfa984ee81268e10b9311ac9d2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0ab34a9e4cd5b88b522cc156e792cefe3085334"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b498f0da45a388b40195f7198455c62fe366a372"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d64461d38972302f0243498ff409b0d54e14e106"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-40102 (GCVE-0-2025-40102)

Vulnerability from cvelistv5 – Published: 2025-10-30 09:48 – Updated: 2026-09-02 12:49

Title

KVM: arm64: Prevent access to vCPU events before init

Summary

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6794 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/b0ab34a9e4cd5b88b…
https://git.kernel.org/stable/c/d64461d38972302f0…
https://git.kernel.org/stable/c/b498f0da45a388b40…
https://git.kernel.org/stable/c/7b854e68365a84dfa…
https://git.kernel.org/stable/c/c0fcd72e7eb50205d…
https://git.kernel.org/stable/c/64a04e6320fc5affb…
https://git.kernel.org/stable/c/0aa1b76fe14296292…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < b0ab34a9e4cd5b88b522cc156e792cefe3085334 (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < d64461d38972302f0243498ff409b0d54e14e106 (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < b498f0da45a388b40195f7198455c62fe366a372 (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < 7b854e68365a84dfa984ee81268e10b9311ac9d2 (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < 64a04e6320fc5affbadc59dc7024d79f909bfe84 (git) Affected: b7b27facc7b50a5fce0afaa3df56157136ce181a , < 0aa1b76fe1429629215a7c79820e4b96233ac4a3 (git)
Linux	Linux	Affected: 4.19 Unaffected: 0 , < 4.19 (semver) Unaffected: 5.10.269 , ≤ 5.10.* (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.156 , ≤ 6.6.* (semver) Unaffected: 6.12.108 , ≤ 6.12.* (semver) Unaffected: 6.17.5 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/arm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b0ab34a9e4cd5b88b522cc156e792cefe3085334",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "d64461d38972302f0243498ff409b0d54e14e106",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "b498f0da45a388b40195f7198455c62fe366a372",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "7b854e68365a84dfa984ee81268e10b9311ac9d2",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "64a04e6320fc5affbadc59dc7024d79f909bfe84",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            },
            {
              "lessThan": "0aa1b76fe1429629215a7c79820e4b96233ac4a3",
              "status": "affected",
              "version": "b7b27facc7b50a5fce0afaa3df56157136ce181a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/arm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.269",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.220",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.187",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.156",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.108",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.5",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Prevent access to vCPU events before init\n\nAnother day, another syzkaller bug. KVM erroneously allows userspace to\npend vCPU events for a vCPU that hasn\u0027t been initialized yet, leading to\nKVM interpreting a bunch of uninitialized garbage for routing /\ninjecting the exception.\n\nIn one case the injection code and the hyp disagree on whether the vCPU\nhas a 32bit EL1 and put the vCPU into an illegal mode for AArch64,\ntripping the BUG() in exception_target_el() during the next injection:\n\n  kernel BUG at arch/arm64/kvm/inject_fault.c:40!\n  Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n  CPU: 3 UID: 0 PID: 318 Comm: repro Not tainted 6.17.0-rc4-00104-g10fd0285305d #6 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : exception_target_el+0x88/0x8c\n  lr : pend_serror_exception+0x18/0x13c\n  sp : ffff800082f03a10\n  x29: ffff800082f03a10 x28: ffff0000cb132280 x27: 0000000000000000\n  x26: 0000000000000000 x25: ffff0000c2a99c20 x24: 0000000000000000\n  x23: 0000000000008000 x22: 0000000000000002 x21: 0000000000000004\n  x20: 0000000000008000 x19: ffff0000c2a99c20 x18: 0000000000000000\n  x17: 0000000000000000 x16: 0000000000000000 x15: 00000000200000c0\n  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000\n  x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000\n  x8 : ffff800082f03af8 x7 : 0000000000000000 x6 : 0000000000000000\n  x5 : ffff800080f621f0 x4 : 0000000000000000 x3 : 0000000000000000\n  x2 : 000000000040009b x1 : 0000000000000003 x0 : ffff0000c2a99c20\n  Call trace:\n   exception_target_el+0x88/0x8c (P)\n   kvm_inject_serror_esr+0x40/0x3b4\n   __kvm_arm_vcpu_set_events+0xf0/0x100\n   kvm_arch_vcpu_ioctl+0x180/0x9d4\n   kvm_vcpu_ioctl+0x60c/0x9f4\n   __arm64_sys_ioctl+0xac/0x104\n   invoke_syscall+0x48/0x110\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x34/0xf0\n   el0t_64_sync_handler+0xa0/0xe4\n   el0t_64_sync+0x198/0x19c\n  Code: f946bc01 b4fffe61 9101e020 17fffff2 (d4210000)\n\nReject the ioctls outright as no sane VMM would call these before\nKVM_ARM_VCPU_INIT anyway. Even if it did the exception would\u0027ve been\nthrown away by the eventual reset of the vCPU\u0027s state."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T12:49:25.880Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b0ab34a9e4cd5b88b522cc156e792cefe3085334"
        },
        {
          "url": "https://git.kernel.org/stable/c/d64461d38972302f0243498ff409b0d54e14e106"
        },
        {
          "url": "https://git.kernel.org/stable/c/b498f0da45a388b40195f7198455c62fe366a372"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b854e68365a84dfa984ee81268e10b9311ac9d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0fcd72e7eb50205dc20731033b0b1c67ecbe4dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/64a04e6320fc5affbadc59dc7024d79f909bfe84"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aa1b76fe1429629215a7c79820e4b96233ac4a3"
        }
      ],
      "title": "KVM: arm64: Prevent access to vCPU events before init",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40102",
    "datePublished": "2025-10-30T09:48:07.790Z",
    "dateReserved": "2025-04-16T07:20:57.164Z",
    "dateUpdated": "2026-09-02T12:49:25.880Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted