{"id":"CVE-2026-98433","published":"2026-10-18T15:16:53.047","lastModified":"2026-10-18T15:16:53.047","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa","tags":[]},{"url":"https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba","tags":[]},{"url":"https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae","tags":[]},{"url":"https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388","tags":[]},{"url":"https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50","tags":[]},{"url":"https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95","tags":[]},{"url":"https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b","tags":[]},{"url":"https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}