{"schema":"threatline.record/2","record":{"id":"CVE-2026-98283","aliases":[],"summary":"KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","source_modified_at":"2026-10-19T09:16:54.747Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"4d8f7b1f586375df8bce23a0909566ad5e852259","status":"affected","versionType":"git"},{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"e37fba1ba69385cff2d0e60b371ee19e7d1852d1","status":"affected","versionType":"git"},{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"24b634852413229bb8340d908b115c3365f3a247","status":"affected","versionType":"git"},{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"fbf69b7d0555ee83c871f58750770f74b7179ad1","status":"affected","versionType":"git"},{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"ec2d7a52b3996ae81131617b4afc0af31583c1b4","status":"affected","versionType":"git"},{"version":"e3b6b4661527e821ffbe3db83952fdb1e6e47c49","lessThan":"51938dfa8a51a4f85328413fca9b6e21f9d2d088","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","source_modified_at":"2026-10-19T09:16:54.747Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","source_modified_at":"2026-10-19T09:16:54.747Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"4d8f7b1f586375df8bce23a0909566ad5e852259","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","source_modified_at":"2026-10-19T09:16:54.747Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"24b634852413229bb8340d908b115c3365f3a247","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","source_modified_at":"2026-10-19T09:16:54.747Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"51938dfa8a51a4f85328413fca9b6e21f9d2d088","basis":"first unaffected version stated in the CVE record"}],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00135,"percentile":0.02678,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:44.593Z","modified_at":"2026-10-19T09:16:54.747Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98283","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:54.747Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98283","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4d8f7b1f586375df8bce23a0909566ad5e852259"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e37fba1ba69385cff2d0e60b371ee19e7d1852d1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/24b634852413229bb8340d908b115c3365f3a247"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fbf69b7d0555ee83c871f58750770f74b7179ad1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ec2d7a52b3996ae81131617b4afc0af31583c1b4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/51938dfa8a51a4f85328413fca9b6e21f9d2d088"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:16:54.747Z","content_hash":"822f2fc6176fe1333b42307b091f1d34aeb35d0e7d1d08bfa17eb6a86c10b2d3"}}