{"schema":"threatline.record/2","record":{"id":"CVE-2026-98254","aliases":[],"summary":"swiotlb: use the adjusted address for the highmem page lookup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nswiotlb: use the adjusted address for the highmem page lookup\n\nswiotlb_bounce() reads the page frame number from the slot's recorded\norig_addr, then advances orig_addr by tlb_offset to reach the address\nthe caller asked about. The highmem branch mixes the two: the offset\nwithin the page comes from the adjusted address, the page from the value\nbefore it.\n\nOnce the adjustment crosses a page boundary the pair no longer describes\none location, and the whole copy lands one page below the intended one\nfor a positive tlb_offset, one above for a negative one. DMA_FROM_DEVICE\nwrites the device data over the wrong page and leaves the intended one\nstale, DMA_TO_DEVICE feeds the device from a page the mapping may not\ncover. Partial syncs through dma_sync_single_range_for_*() are what make\ntlb_offset non-zero.\n\nThe branch test is picked the same way, so a slot recorded in lowmem can\nbe adjusted into highmem and the lowmem path then hands a highmem\naddress to phys_to_virt().\n\nTake both from orig_addr once it is final and keep pfn in the branch\nthat uses it. PhysHighMem() asks the question straight from the address,\nas dma-debug already does.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5f89468e2f060031cd89fd4287298e0eaf246bf6","lessThan":"6e53b4d6afbde626255805d438cabb1cac482445","status":"affected","versionType":"git"},{"version":"5f89468e2f060031cd89fd4287298e0eaf246bf6","lessThan":"aa4709813b29db89f2307f968db5d24925dcdeb1","status":"affected","versionType":"git"},{"version":"5f89468e2f060031cd89fd4287298e0eaf246bf6","lessThan":"0219b72f5c209732b2f03a8cc0d7240b5e428a99","status":"affected","versionType":"git"},{"version":"5f89468e2f060031cd89fd4287298e0eaf246bf6","lessThan":"b7d7914a9ae3097e63d113007e4fb44d33d515b1","status":"affected","versionType":"git"},{"version":"e6108147dd91b94d1979b110f265710c254c99d5","status":"affected","versionType":"git"},{"version":"e77b796eb9b7ca3c1c0d574d0c155f55b59ca8d5","status":"affected","versionType":"git"},{"version":"5.10.47","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.12.14","lessThan":"5.13","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","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-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6e53b4d6afbde626255805d438cabb1cac482445","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0219b72f5c209732b2f03a8cc0d7240b5e428a99","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.11","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","source_modified_at":"2026-10-19T09:16:25.551Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.13","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00138,"percentile":0.02894,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:20.736Z","modified_at":"2026-10-19T09:16:25.551Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98254","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:25.551Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98254","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/6e53b4d6afbde626255805d438cabb1cac482445"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0219b72f5c209732b2f03a8cc0d7240b5e428a99"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b7d7914a9ae3097e63d113007e4fb44d33d515b1"}],"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":"2026-10-19T09:16:25.551Z","content_hash":"da517a10f90459ba308108bbfd1ceee8543b6ae20699939697e0cff00165caf6"}}