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CVE-2026-98262

Estado: RecibidaSin puntuar—

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.

Leer descripción completaMostrar menos

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.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-98262",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "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",
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              "versionType": "git"
            },
            {
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              "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-rc4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/ata/libahci.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-06T09:18:15.347",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY\n\nA user reported that commit 105c42566a55 (\"ata: ahci: force 32-bit DMA for\nJMicron JMB582/JMB585\") made the JMicron JMB585 unusable on his board.\n\nThe failure is seen as soon as the ahci driver is probed, and booting with\niommu=off does not solve the problem.\n\nLooking at the AHCI specification, PxCLBU and PxFBU are both read only '0'\nfor HBAs that do not support 64-bit addressing.\n\nFor HBAs that do support 64-bit addressing, the registers are read write,\nwith a reset value that is Implementation Specific.\n\nWhen using the AHCI_HFLAG_32BIT_ONLY flag, the HBA does support 64-bit\naddressing, and a 32-bit DMA mask is set by simply clearing HOST_CAP_64.\nThus, in this case, we need to explicitly clear the registers to 0."
    }
  ],
  "lastModified": "2026-10-06T09:18:15.347",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}