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ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY A user reported that commit 105c42566a55 ("ata: ahci: force 32-bit DMA for JMicron JMB582/JMB585") made the JMicron JMB585 unusable on his board. The failure is seen as soon as the ahci driver is probed, and booting with iommu=off does not solve the problem. Looking at the AHCI specification, PxCLBU and PxFBU are both read only '0' for HBAs that do not support 64-bit addressing. For HBAs that do support 64-bit addressing, the registers are read write, with a reset value that is Implementation Specific. When using the AHCI_HFLAG_32BIT_ONLY flag, the HBA does support 64-bit addressing, and a 32-bit DMA mask is set by simply clearing HOST_CAP_64. Thus, in this case, we need to explicitly clear the registers to 0.

Announced Source revision 1
Original source ↗

CVE-2026-98262

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-2026-98262

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": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "0191c9ff23ef1678dbfb5ad253a2dee92feb5d71",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "8f510f68208a1f673d7c7234a687be4671490e9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "4719424bb7cb9f20b73986bcb72dd528f0e5c6eb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "a5a8b4737f68bbac8aa0685af0c8921e6003c22b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "b28a17d4a9bb0aa38b48681c3927b012ba40eabe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "b691a3e244278362e552439d6d3ee5a5d3703488",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "7912ad8fb5233bb8cfe21d50df639c7f4854ff9d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
        "lessThan": "82e47533221d4746947b74d2e79a478c36c6433a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/ata/libahci.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.22"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.22",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "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": [
      "drivers/ata/libahci.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98262

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#38343 · Revision 1
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