{"api_version":"1","generated_at":"2026-10-11T09:29:25+00:00","cve":"CVE-2026-98262","urls":{"html":"https://cve.report/CVE-2026-98262","api":"https://cve.report/api/cve/CVE-2026-98262.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98262","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98262"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:15","updated_at":"2026-10-06 09:18:15"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb","name":"https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71","name":"https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a","name":"https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe","name":"https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b","name":"https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488","name":"https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c","name":"https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d","name":"https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98262","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98262","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c 8f510f68208a1f673d7c7234a687be4671490e9c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c a5a8b4737f68bbac8aa0685af0c8921e6003c22b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.222 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98262","cve":"CVE-2026-98262","epss":"0.001840000","percentile":"0.073050000","score_date":"2026-10-06","updated_at":"2026-10-07 00:14:55"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/ata/libahci.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0191c9ff23ef1678dbfb5ad253a2dee92feb5d71","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"8f510f68208a1f673d7c7234a687be4671490e9c","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"4719424bb7cb9f20b73986bcb72dd528f0e5c6eb","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"a5a8b4737f68bbac8aa0685af0c8921e6003c22b","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"b28a17d4a9bb0aa38b48681c3927b012ba40eabe","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"b691a3e244278362e552439d6d3ee5a5d3703488","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"7912ad8fb5233bb8cfe21d50df639c7f4854ff9d","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"},{"lessThan":"82e47533221d4746947b74d2e79a478c36c6433a","status":"affected","version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/ata/libahci.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.22"},{"lessThan":"2.6.22","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.271","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.271","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"2.6.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"2.6.22","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-10-06T08:45:26.118Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0191c9ff23ef1678dbfb5ad253a2dee92feb5d71"},{"url":"https://git.kernel.org/stable/c/8f510f68208a1f673d7c7234a687be4671490e9c"},{"url":"https://git.kernel.org/stable/c/4719424bb7cb9f20b73986bcb72dd528f0e5c6eb"},{"url":"https://git.kernel.org/stable/c/a5a8b4737f68bbac8aa0685af0c8921e6003c22b"},{"url":"https://git.kernel.org/stable/c/b28a17d4a9bb0aa38b48681c3927b012ba40eabe"},{"url":"https://git.kernel.org/stable/c/b691a3e244278362e552439d6d3ee5a5d3703488"},{"url":"https://git.kernel.org/stable/c/7912ad8fb5233bb8cfe21d50df639c7f4854ff9d"},{"url":"https://git.kernel.org/stable/c/82e47533221d4746947b74d2e79a478c36c6433a"}],"title":"ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98262","datePublished":"2026-10-06T08:45:26.118Z","dateReserved":"2026-09-25T10:25:14.332Z","dateUpdated":"2026-10-06T08:45:26.118Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:15","lastModifiedDate":"2026-10-06 09:18:15","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98262","Ordinal":"1","Title":"ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY","CVE":"CVE-2026-98262","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98262","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY"}]}}}