CVE-2026-98262

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Source
https://cve.org/CVERecord?id=CVE-2026-98262
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98262.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-98262
Downstream
Published
2026-10-06T08:45:26Z
Modified
2026-10-07T02:47:33Z
Summary
ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98262.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c
Fixed
0191c9ff23ef1678dbfb5ad253a2dee92feb5d71
Fixed
8f510f68208a1f673d7c7234a687be4671490e9c
Fixed
4719424bb7cb9f20b73986bcb72dd528f0e5c6eb
Fixed
a5a8b4737f68bbac8aa0685af0c8921e6003c22b
Fixed
b28a17d4a9bb0aa38b48681c3927b012ba40eabe
Fixed
b691a3e244278362e552439d6d3ee5a5d3703488
Fixed
7912ad8fb5233bb8cfe21d50df639c7f4854ff9d
Fixed
82e47533221d4746947b74d2e79a478c36c6433a

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98262.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.22
Fixed
5.10.271
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.222
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.189
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.158
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.112
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.54
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.2.8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98262.json"