ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY
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.
CVE-2026-98262
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98262
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "0191c9ff23ef1678dbfb5ad253a2dee92feb5d71",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "8f510f68208a1f673d7c7234a687be4671490e9c",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "4719424bb7cb9f20b73986bcb72dd528f0e5c6eb",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "a5a8b4737f68bbac8aa0685af0c8921e6003c22b",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "b28a17d4a9bb0aa38b48681c3927b012ba40eabe",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "b691a3e244278362e552439d6d3ee5a5d3703488",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "7912ad8fb5233bb8cfe21d50df639c7f4854ff9d",
"versionType": "git"
},
{
"status": "affected",
"version": "c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c",
"lessThan": "82e47533221d4746947b74d2e79a478c36c6433a",
"versionType": "git"
}
],
"programFiles": [
"drivers/ata/libahci.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.22"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.22",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/ata/libahci.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98262
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38343 · Revision 1
- Added to Heist Feed
- Publisher date