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CVE-2026-98282— powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba

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： powerpc/iommu：修复 iommu_tce_check_ioba 中的溢出验证问题 提交 b1af23d836f8（“KVM: PPC: iommu：统一 TCE 检查”）将 KVM 和 VFIO 中的 IOBA 参数检查统一到了 函数中。然而，在此过程中，传入的参数 被忽略，而使用了常量值 ，从而可能遗漏了溢出检查。因为调用者在处理 或 等情况时， legitimately（合法地）可以使用 。 修复方法是通过计入 、检查算术溢出，并验证整个请求的范围（ ）不超

CVSS 8.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b1af23d836f811137d504d14d4cbdd01929dec34< 98d8dcc4ebd10523507d4478e148809a7771a213 affected
b1af23d836f811137d504d14d4cbdd01929dec34< 9fd9c9bbb05417f468a11fb6d145d7ff61f4a868 affected
b1af23d836f811137d504d14d4cbdd01929dec34< 3776bf56e06980e8a12c8c0565d9e6ac44965f03 affected
b1af23d836f811137d504d14d4cbdd01929dec34< d6a1779129d936bc1fbab80181165da544eab736 affected
b1af23d836f811137d504d14d4cbdd01929dec34< d48ceb6e1a6915c7bac4f902554a1047365cdff2 affected
b1af23d836f811137d504d14d4cbdd01929dec34< 0543813753ef5cfbd6fa96694f7acf783fa01af7 affected
b1af23d836f811137d504d14d4cbdd01929dec34< 314091243159f8e3749bc719bb129f423f72fd86 affected
b1af23d836f811137d504d14d4cbdd01929dec34< 0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71 affected
… +10 more rows
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I. Basic Information for CVE-2026-98282

Vulnerability Information
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Vulnerability Title
powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/iommu: Fix the overflow validation in iommu_tce_check_ioba The commit b1af23d836f8 ("KVM: PPC: iommu: Unify TCE checking") unified IOBA parameter checking across KVM and VFIO into iommu_tce_check_ioba(). While doing so, the passed in argument npages is ignored and constant value '1' is used leaving out a possible overflow as the callers can legitimately be using npages > 1 for H_STUFF_TCE or H_PUT_TCE_INDIRECT cases. Fix this by accounting for 'npages', checking for arithmetic overflow, and verifying that the entire requested range (ioba - offset + npages) does not exceed the table capacity 'size'.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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 b1af23d836f811137d504d14d4cbdd01929dec34 ~ 98d8dcc4ebd10523507d4478e148809a7771a213 -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-98282

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III. Intelligence Information for CVE-2026-98282

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Patches & Fixes for CVE-2026-98282 (8)

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-2026-98283 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-2026-98241 7.8 HIGH ipv6: xfrm: use full sockets in local error paths
CVE-2026-98341 7.8 HIGH wifi: cfg80211: don't free driver-owned scan requests
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
CVE-2026-98276 7.8 HIGH net: lock the socket in sock_gettstamp()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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