{"id":"CVE-2026-98262","revision":"161739c0869d47deabf9c2cedb925927","records":[{"revision":"161739c0869d47deabf9c2cedb925927","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98262","aliases":[],"title":"ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY","description":"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.","state":0,"publishedAt":"2026-10-06T08:45:26.118+00:00","modifiedAt":"2026-10-19T09:16:33.319+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/ata/libahci.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"0191c9ff23ef1678dbfb5ad253a2dee92feb5d71\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"8f510f68208a1f673d7c7234a687be4671490e9c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"4719424bb7cb9f20b73986bcb72dd528f0e5c6eb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"a5a8b4737f68bbac8aa0685af0c8921e6003c22b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"b28a17d4a9bb0aa38b48681c3927b012ba40eabe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"b691a3e244278362e552439d6d3ee5a5d3703488\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"7912ad8fb5233bb8cfe21d50df639c7f4854ff9d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c\",\n                            \"lessThan\": \"82e47533221d4746947b74d2e79a478c36c6433a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/ata/libahci.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.22\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.22\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.54\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71","https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c","https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb","https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b","https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe","https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488","https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d","https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98262","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98262","identifiers":["CVE-2026-98262"]},"retained":false,"historicalAffected":[]}],"coverage":[]}