180 lines
10 KiB
JSON
180 lines
10 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-89445",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-09-11T19:38:34.704Z",
|
|
"datePublished": "2026-09-11T19:43:12.765Z",
|
|
"dateUpdated": "2026-10-19T08:46:54.686Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-10-19T08:46:54.686Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix UAF in selftest IOPF reporting\n\nIOMMUFD selftest TRIGGER_IOPF borrows an attach handle from\ngroup->pasid_array without synchronizing against PASID detach,\nthen a concurrent iommu_report_device_fault() can dereference\nthat borrowed handle's domain pointer after the detach erases\nthe handle and frees the backing struct iommufd_attach_handle.\nTRIGGER_IOPF then dereferences the freed handle, causing a UAF.\n\nFix by adding a iopf_rwsem in mock_dev to follow the expected design\nof a real driver. Hold its read side across the whole\niommu_report_device_fault() call, and its write side around every\npath that attaches, detaches, or replaces a device domain.\nThis can block new reports and drains in-flight reports before an old\nattach handle or the IOPF fault parameter can be removed.\nAlso take the write side while registering a mock device, since\nit can invoke the mock driver's default-domain attach callback."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
|
|
"baseScore": 8.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The UAF is reached only via local ioctls on /dev/iommu (or VFIO-compat /dev/vfio/vfio): IOMMU_TEST_CMD TRIGGER_IOPF calls iommu_report_device_fault() while a concurrent PASID/RID detach frees the attach handle. No network or packet-receive path exists.\nAC:L - The attacker controls both sides of the race by issuing concurrent IOMMU_TEST_OP_TRIGGER_IOPF and PASID_DETACH/REPLACE or mock-domain destroy on the same fd; iommu_attach_handle_get() does not keep the handle alive after lookup, so no victim timing or uncontrollable layout is required.\nPR:L - iommufd_fops_open() and IOMMU_TEST_CMD perform no capability checks; /dev/iommu is 0660 and MOCK_DOMAIN creates an IOPF-capable mock device without physical assignment, so an unprivileged local user with iommufd access (selftest/syzkaller kernels or VFIO/iommufd group membership) can trigger it without init-namespace root.\nUI:N - Exploitation requires no victim action; the attacker programmatically opens iommufd, creates a mock domain, attaches a PASID, and races TRIGGER_IOPF against detach through their own file descriptors and ioctls.\nS:C - The freed object is struct iommufd_attach_handle used by iommu_report_device_fault() to dispatch domain->iopf_handler and complete IOMMU page faults; pre-fix TRIGGER_IOPF also accepted any bound idev, so corrupting those handles can hijack IOMMU fault/DMA isolation across the device-assignment boundary.\nC:H - Use-after-free of iommufd_attach_handle lets an attacker reclaim the slab and control the domain pointer later read as attach_handle->domain->iopf_handler, enabling arbitrary kernel reads through the IOPF handler and fault-queue path.\nI:H - The UAF is a function-pointer dereference of domain->iopf_handler plus later handle use in iommufd_fault_iopf_handler; heap spraying yields an arbitrary write and control-flow hijack in the IOMMU fault-completion path.\nA:H - Dereferencing the freed attach handle in find_fault_handler()/iommu_report_device_fault() causes a kernel oops or panic; the UAF is reliably crashable even when not fully exploited for code execution."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"drivers/iommu/iommufd/selftest.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "ddee19971081b42615d62f4fdada21274708ed4d",
|
|
"lessThan": "fd2e7ac94d6d813548b021473c3dddc30c8c07d1",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ddee19971081b42615d62f4fdada21274708ed4d",
|
|
"lessThan": "cab2895729516799384d48560e6fca105fb3f927",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ddee19971081b42615d62f4fdada21274708ed4d",
|
|
"lessThan": "e27e90bde68b2ab92e63ed19caad1ef57188bea0",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "ddee19971081b42615d62f4fdada21274708ed4d",
|
|
"lessThan": "8c07df7cdfcf52f1ff276c588612aabc6c6b8399",
|
|
"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/iommu/iommufd/selftest.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.11",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.11",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.112",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.50",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.2.4",
|
|
"lessThanOrEqual": "7.2.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.3",
|
|
"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": "6.11",
|
|
"versionEndExcluding": "6.12.112"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.11",
|
|
"versionEndExcluding": "6.18.50"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.11",
|
|
"versionEndExcluding": "7.2.4"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.11",
|
|
"versionEndExcluding": "7.3"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/fd2e7ac94d6d813548b021473c3dddc30c8c07d1"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/cab2895729516799384d48560e6fca105fb3f927"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/e27e90bde68b2ab92e63ed19caad1ef57188bea0"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/8c07df7cdfcf52f1ff276c588612aabc6c6b8399"
|
|
}
|
|
],
|
|
"title": "iommufd: Fix UAF in selftest IOPF reporting",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |