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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： ata: libahci：为 AHCI_HFLAG_32BIT_ONLY 标志清零 PxCLBU 和 PxFBU 寄存器 有用户报告称，提交 105c42566a55（“ata: ahci: 为 JMicron JMB582/JMB585 强制使用 32 位 DMA”）导致其主板上的 JMicron JMB585 控制器无法使用。 该故障在 ahci 驱动程序探测时立即出现，且通过关闭 IOMMU（iommu=off）也无法解决问题。 查阅 AHCI 规范可知，对于不支持

AI Predicted 5.3 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71 affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< 8f510f68208a1f673d7c7234a687be4671490e9c affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< 4719424bb7cb9f20b73986bcb72dd528f0e5c6eb affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< a5a8b4737f68bbac8aa0685af0c8921e6003c22b affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< b28a17d4a9bb0aa38b48681c3927b012ba40eabe affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< b691a3e244278362e552439d6d3ee5a5d3703488 affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< 7912ad8fb5233bb8cfe21d50df639c7f4854ff9d affected
c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c< 82e47533221d4746947b74d2e79a478c36c6433a affected
… +10 more rows
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I. Basic Information for CVE-2026-98262

Vulnerability Information
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Vulnerability Title
ata: libahci: clear PxCLBU and PxFBU for AHCI_HFLAG_32BIT_ONLY
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c ~ 0191c9ff23ef1678dbfb5ad253a2dee92feb5d71 -
Linux Linux 2.6.22 -

II. Public POCs for CVE-2026-98262

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III. Intelligence Information for CVE-2026-98262

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Patches & Fixes for CVE-2026-98262 (7)

Same Patch Batch · Linux · 2026-10-06 · 208 CVEs total

CVE-2026-98323 9.8 CRITICAL RDMA/siw: Bound fragmented header copies by the remaining length
CVE-2026-98365 9.8 CRITICAL RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access
CVE-2026-98282 8.8 HIGH powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
CVE-2026-98283 8.8 HIGH KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()
CVE-2026-98339 8.8 HIGH wifi: cfg80211: don't filter by BSS type when removing stale entries
CVE-2026-98171 8.8 HIGH smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
CVE-2026-98261 8.1 HIGH cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
CVE-2026-98357 8.1 HIGH IB/isert: wait for deferred control PDU completions before releasing the connection
CVE-2026-98239 8.1 HIGH net: lan743x: fix RX checksum use-after-free
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
CVE-2026-98324 7.8 HIGH dmaengine: pxa: fix double counting of the hw descriptors
CVE-2026-98320 7.8 HIGH netfilter: flowtable: hold reference on ct until flow is released
CVE-2026-98228 7.8 HIGH mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ
CVE-2026-98229 7.8 HIGH xfrm: save input state data before secpath resets
CVE-2026-98318 7.8 HIGH smb: client: validate absolute native symlink targets before NT fixups
CVE-2026-98315 7.8 HIGH ntfs: protect runlist updates with the runlist lock
CVE-2026-98260 7.8 HIGH exec: Cleanup POSIX timers right after de_thread()
CVE-2026-98256 7.8 HIGH signal: Prevent exec() race
CVE-2026-98258 7.8 HIGH posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
CVE-2026-98254 7.8 HIGH swiotlb: use the adjusted address for the highmem page lookup

Showing top 20 of 208 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98262

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