{"id":"CVE-2026-98283","revision":"d4b51b15a40e44139b02257d9cc3feae","records":[{"revision":"d4b51b15a40e44139b02257d9cc3feae","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98283","aliases":[],"title":"KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()\n\nkvmhv_emulate_tlbie_all_lpid() iterates the nested-guest IDR and drops\nmmu_lock before calling kvmhv_emulate_tlbie_lpid(), but does not hold a\nreference on the kvm_nested_guest pointer obtained from the IDR.  A\nconcurrent vCPU issuing a single-LPID tlbie (is=2, ric=2) can race\nthrough kvmhv_flush_nested() -> kvmhv_remove_nested() -> idr_remove /\n--refcnt -> kvmhv_release_nested() -> kfree(gp) in that window, leaving\nthe iterating vCPU with a dangling pointer.  The subsequent\nmutex_lock(&gp->tlb_lock) and accesses to gp->shadow_pgtable,\ngp->shadow_lpid and gp->l1_host all touch freed memory.  The free path\nis fully L1-controlled.\n\nFix this by incrementing gp->refcnt inside the loop before dropping\nmmu_lock, mirroring what kvmhv_get_nested() does, and releasing the\nreference with kvmhv_put_nested() after the per-guest work completes.\nThis is the same get/put discipline already used at every other\ncall site that drops mmu_lock while holding a nested-guest pointer.","state":0,"publishedAt":"2026-10-06T08:45:44.593+00:00","modifiedAt":"2026-10-19T09:16:54.747+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/powerpc/kvm/book3s_hv_nested.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"4d8f7b1f586375df8bce23a0909566ad5e852259\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"e37fba1ba69385cff2d0e60b371ee19e7d1852d1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"24b634852413229bb8340d908b115c3365f3a247\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"fbf69b7d0555ee83c871f58750770f74b7179ad1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"ec2d7a52b3996ae81131617b4afc0af31583c1b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e3b6b4661527e821ffbe3db83952fdb1e6e47c49\",\n                            \"lessThan\": \"51938dfa8a51a4f85328413fca9b6e21f9d2d088\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/powerpc/kvm/book3s_hv_nested.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.20\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.20\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/4d8f7b1f586375df8bce23a0909566ad5e852259","https://git.kernel.org/stable/c/e37fba1ba69385cff2d0e60b371ee19e7d1852d1","https://git.kernel.org/stable/c/24b634852413229bb8340d908b115c3365f3a247","https://git.kernel.org/stable/c/fbf69b7d0555ee83c871f58750770f74b7179ad1","https://git.kernel.org/stable/c/ec2d7a52b3996ae81131617b4afc0af31583c1b4","https://git.kernel.org/stable/c/51938dfa8a51a4f85328413fca9b6e21f9d2d088"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98283","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98283","identifiers":["CVE-2026-98283"]},"retained":false,"historicalAffected":[]}],"coverage":[]}