CVE-2026-98262 (GCVE-0-2026-98262)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:45 – Updated: 2026-10-06 08:45
VLAI
Title
ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71 (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < 8f510f68208a1f673d7c7234a687be4671490e9c (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < a5a8b4737f68bbac8aa0685af0c8921e6003c22b (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < b28a17d4a9bb0aa38b48681c3927b012ba40eabe (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < b691a3e244278362e552439d6d3ee5a5d3703488 (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d (git)
Affected: c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c , < 82e47533221d4746947b74d2e79a478c36c6433a (git)
Create a notification for this product.
Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "dateReserved": "2026-09-25T10:25:14.332Z",
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            "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 \u00270\u0027\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."
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-08T16:49:01Z",
      "cve": "CVE-2026-98262",
      "id": "CVE-2026-98262",
      "initial_release_date": "2026-10-08T16:49:01Z",
      "product_status:known_affected": "301",
      "product_status:known_not_affected": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98262",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98262.json",
      "version": "2"
    }
  }
}



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