CVE-2026-98262ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 8f510f68208a1f673d7c7234a687be4671490e9c; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before a5a8b4737f68bbac8aa0685af0c8921e6003c22b; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before b28a17d4a9bb0aa38b48681c3927b012ba40eabe; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before b691a3e244278362e552439d6d3ee5a5d3703488; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d; from c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c before 82e47533221d4746947b74d2e79a478c36c6433a | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.