CVE-2026-98433
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure In kvmppc_svm_page_in(), if uv_page_in() fails after kvmppc_uvmem_get_page() has succeeded, the secure device page is never released. kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap, allocates a kvmppc_uvmem_page_pvt struct, marks the GFN as KVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets refcount=1 and locks the page. The subsequent goto out_finalize skips the *mig.dst assignment, so migrate_vma_finalize() is a no-op for the page, and none of those resources are ever reclaimed. Each occurrence permanently consumes one entry from the firmware-bounded secure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN marked as secure — making it unusable for the lifetime of the VM. The twin __kvmppc_svm_page_out() already handles the analogous uv_page_out() failure correctly with unlock_page(dpage); __free_page(dpage). Apply the same pattern here: unlock_page() followed by put_page(), which chains through free_zone_device_folio() into kvmppc_uvmem_folio_free() to clear the bitmap bit, free pvt, and reset the GFN state. Reachable whenever uv_page_in() returns an error (e.g. UV pool exhaustion) on any POWER9/10 + Ultravisor/PEF system.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-18 15:16:53.047000
Last modified
2026-10-19 10:18:51.290000
View original CVE JSON
{
"id": "CVE-2026-98433",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T15:16:53.047",
"lastModified": "2026-10-19T10:18:51.290",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure\n\nIn kvmppc_svm_page_in(), if uv_page_in() fails after\nkvmppc_uvmem_get_page() has succeeded, the secure device page is never\nreleased. kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap,\nallocates a kvmppc_uvmem_page_pvt struct, marks the GFN as\nKVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets\nrefcount=1 and locks the page. The subsequent goto out_finalize skips\nthe *mig.dst assignment, so migrate_vma_finalize() is a no-op for the\npage, and none of those resources are ever reclaimed.\n\nEach occurrence permanently consumes one entry from the firmware-bounded\nsecure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN\nmarked as secure — making it unusable for the lifetime of the VM.\n\nThe twin __kvmppc_svm_page_out() already handles the analogous uv_page_out()\nfailure correctly with unlock_page(dpage); __free_page(dpage). Apply\nthe same pattern here: unlock_page() followed by put_page(), which\nchains through free_zone_device_folio() into kvmppc_uvmem_folio_free()\nto clear the bitmap bit, free pvt, and reset the GFN state.\n\nReachable whenever uv_page_in() returns an error (e.g. UV pool\nexhaustion) on any POWER9/10 + Ultravisor/PEF system."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/powerpc/kvm/book3s_hv_uvmem.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
"lessThan": "ed2f2ff63cb7e71204096e765c6d02c3b6974b95",
"versionType": "git",
"status": "affected"
},
{
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"status": "affected"
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},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/powerpc/kvm/book3s_hv_uvmem.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "5.5",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.5",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.54",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.8",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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