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CVE-2026-98262

ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in 8f510f68208a1f673d7c7234a687be4671490e9c; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in a5a8b4737f68bbac8aa0685af0c8921e6003c22b; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in b28a17d4a9bb0aa38b48681c3927b012ba40eabe; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in b691a3e244278362e552439d6d3ee5a5d3703488; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d; From c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c · fixed in 82e47533221d4746947b74d2e79a478c36c6433a

  • Linux Linux

    2.6.22

  • KernelLinux

    From 2.6.22 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8

git.kernel.org