{"id":"CVE-2026-98254","title":"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 …","summary":"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 …","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 5f89468e2f060031cd89fd4287298e0eaf246bf6 < 6e53b4d6afbde626255805d438cabb1cac482445","Linux >= 5f89468e2f060031cd89fd4287298e0eaf246bf6 < aa4709813b29db89f2307f968db5d24925dcdeb1","Linux >= 5f89468e2f060031cd89fd4287298e0eaf246bf6 < 0219b72f5c209732b2f03a8cc0d7240b5e428a99","Linux >= 5f89468e2f060031cd89fd4287298e0eaf246bf6 < b7d7914a9ae3097e63d113007e4fb44d33d515b1","Linux e6108147dd91b94d1979b110f265710c254c99d5","Linux e77b796eb9b7ca3c1c0d574d0c155f55b59ca8d5","Linux >= 5.10.47 < 5.11","Linux >= 5.12.14 < 5.13","Linux 5.13"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T07:17:06.683","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98254","references":[{"url":"https://git.kernel.org/stable/c/0219b72f5c209732b2f03a8cc0d7240b5e428a99","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e53b4d6afbde626255805d438cabb1cac482445","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b7d7914a9ae3097e63d113007e4fb44d33d515b1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98254.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98254"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2546366"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98254"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98254"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98254.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00129,"epssPercentile":0.02483,"ingestedAt":"2026-10-06T08:50:17.429Z","cwe":["CWE-787"],"scores":{"nvd":7.8,"vendor":7,"cna":7.8},"slug":"CVE-2026-98254","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98254.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":217294,"id":"CVE-2026-98254","ts":1791361308614,"field":"cvss","old":null,"new":"7.8"},{"seq":217293,"id":"CVE-2026-98254","ts":1791361308614,"field":"severity","old":"none","new":"high"}]}