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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98262: ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71, 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb, 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71, 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb, 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.22affected
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71affected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before 8f510f68208a1f673d7c7234a687be4671490e9caffected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before 4719424bb7cb9f20b73986bcb72dd528f0e5c6ebaffected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before a5a8b4737f68bbac8aa0685af0c8921e6003c22baffected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before b28a17d4a9bb0aa38b48681c3927b012ba40eabeaffected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before b691a3e244278362e552439d6d3ee5a5d3703488affected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before 7912ad8fb5233bb8cfe21d50df639c7f4854ff9daffected · git
    • c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c and later · before 82e47533221d4746947b74d2e79a478c36c6433aaffected · git
    • before 2.6.22not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98260Oct 6, 2026 · exec: Cleanup POSIX timers right after de_thread()
    31Monitor
  • ← EarlierCVE-2026-98261Oct 6, 2026 · cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
    32Monitor
  • Later →CVE-2026-98263Oct 6, 2026 · ASoC: codecs: rt712-sdca-dmic: fix uninitialized stream_config->type
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0191c9ff23ef1678dbfb5ad253a2dee92feb5d71Vendor (CNA)
Linux Linux4719424bb7cb9f20b73986bcb72dd528f0e5c6ebVendor (CNA)
Linux Linux7912ad8fb5233bb8cfe21d50df639c7f4854ff9dVendor (CNA)
Linux Linux82e47533221d4746947b74d2e79a478c36c6433aVendor (CNA)
Linux Linux8f510f68208a1f673d7c7234a687be4671490e9cVendor (CNA)
Linux Linuxa5a8b4737f68bbac8aa0685af0c8921e6003c22bVendor (CNA)
Linux Linuxb28a17d4a9bb0aa38b48681c3927b012ba40eabeVendor (CNA)
Linux Linuxb691a3e244278362e552439d6d3ee5a5d3703488Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+31 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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