{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98262","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.332Z","datePublished":"2026-10-06T08:45:26.118Z","dateUpdated":"2026-10-06T08:45:26.118Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-06T08:45:26.118Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ata/libahci.c"],"versions":[{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"0191c9ff23ef1678dbfb5ad253a2dee92feb5d71","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"8f510f68208a1f673d7c7234a687be4671490e9c","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"4719424bb7cb9f20b73986bcb72dd528f0e5c6eb","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"a5a8b4737f68bbac8aa0685af0c8921e6003c22b","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"b28a17d4a9bb0aa38b48681c3927b012ba40eabe","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"b691a3e244278362e552439d6d3ee5a5d3703488","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"7912ad8fb5233bb8cfe21d50df639c7f4854ff9d","status":"affected","versionType":"git"},{"version":"c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c","lessThan":"82e47533221d4746947b74d2e79a478c36c6433a","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ata/libahci.c"],"versions":[{"version":"2.6.22","status":"affected"},{"version":"0","lessThan":"2.6.22","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc4","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"7.3-rc4"}]}]}],"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"}}}}