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swiotlb: use the adjusted address for the highmem page lookup

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: swiotlb: use the adjusted address for the highmem page lookup swiotlb_bounce() reads the page frame number from the slot's recorded orig_addr, then advances orig_addr by tlb_offset to reach the address the caller asked about. The highmem branch mixes the two: the offset within the page comes from the adjusted address, the page from the value before it. Once the adjustment crosses a page boundary the pair no longer describes one location, and the whole copy lands one page below the intended one for a positive tlb_offset, one above for a negative one. DMA_FROM_DEVICE writes the device data over the wrong page and leaves the intended one stale, DMA_TO_DEVICE feeds the device from a page the mapping may not cover. Partial syncs through dma_sync_single_range_for_*() are what make tlb_offset non-zero. The branch test is picked the same way, so a slot recorded in lowmem can be adjusted into highmem and the lowmem path then hands a highmem address to phys_to_virt(). Take both from orig_addr once it is final and keep pfn in the branch that uses it. PhysHighMem() asks the question straight from the address, as dma-debug already does.

Announced Source revision 1
Original source ↗

CVE-2026-98254

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98254

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
        "lessThan": "6e53b4d6afbde626255805d438cabb1cac482445",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
        "lessThan": "aa4709813b29db89f2307f968db5d24925dcdeb1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
        "lessThan": "0219b72f5c209732b2f03a8cc0d7240b5e428a99",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
        "lessThan": "b7d7914a9ae3097e63d113007e4fb44d33d515b1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e6108147dd91b94d1979b110f265710c254c99d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e77b796eb9b7ca3c1c0d574d0c155f55b59ca8d5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.47",
        "lessThan": "5.11",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.12.14",
        "lessThan": "5.13",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "kernel/dma/swiotlb.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/dma/swiotlb.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98254

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38333 · Revision 1
Added to Heist Feed
Publisher date
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