{"id":"CVE-2026-98433","state":"PUBLISHED","title":"KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure","description":"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.","publishedAt":"2026-10-18T14:38:18.296Z","updatedAt":"2026-10-19T09:19:29.371Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"ed2f2ff63cb7e71204096e765c6d02c3b6974b95","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"8f3b7746874b39fc20e0363c9076c7787d4765ba","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"a933d7024359e2e566b07903d1294b84f90482ae","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"c41088b2765af1e97e7bb05f906ae1823eca0388","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"dfb84274932737e338ff5eb27f34b4c8ecb01b50","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"fcbff8008b0e08cd53b611bd0ff7e01f5b962f80","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"0a416ee20bcccddf91ca5b63696a23b9d11d73aa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/kvm/book3s_hv_uvmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/kvm/book3s_hv_uvmem.c"]}],"references":["https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95","https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba","https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae","https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388","https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b","https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50","https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80","https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98433.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98433","state":"PUBLISHED","datePublished":"2026-10-18T14:38:18.296Z","dateUpdated":"2026-10-19T09:19:29.371Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.348Z"},"containers":{"cna":{"title":"KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"ed2f2ff63cb7e71204096e765c6d02c3b6974b95","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"8f3b7746874b39fc20e0363c9076c7787d4765ba","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"a933d7024359e2e566b07903d1294b84f90482ae","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"c41088b2765af1e97e7bb05f906ae1823eca0388","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"dfb84274932737e338ff5eb27f34b4c8ecb01b50","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"fcbff8008b0e08cd53b611bd0ff7e01f5b962f80","versionType":"git"},{"version":"ca9f4942670c37407bb109090eaf776ce2ccc54c","status":"affected","lessThan":"0a416ee20bcccddf91ca5b63696a23b9d11d73aa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/kvm/book3s_hv_uvmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/kvm/book3s_hv_uvmem.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95"},{"url":"https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba"},{"url":"https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae"},{"url":"https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388"},{"url":"https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b"},{"url":"https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50"},{"url":"https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80"},{"url":"https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:19:29.371Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}