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CVE-2026-98282

HIGHCVSS 8.8/10EPSS 0.18%

Last modified

CVE-2026-98282 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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'.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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'.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b1af23d836f811137d504d14d4cbdd01929dec34, < 98d8dcc4ebd10523507d4478e148809a7771a213; >= b1af23d836f811137d504d14d4cbdd01929dec34, < 9fd9c9bbb05417f468a11fb6d145d7ff61f4a868; >= b1af23d836f811137d504d14d4cbdd01929dec34, < 3776bf56e06980e8a12c8c0565d9e6ac44965f03; >= b1af23d836f811137d504d14d4cbdd01929dec34, < d6a1779129d936bc1fbab80181165da544eab736; >= b1af23d836f811137d504d14d4cbdd01929dec34, < d48ceb6e1a6915c7bac4f902554a1047365cdff2; >= b1af23d836f811137d504d14d4cbdd01929dec34, < 0543813753ef5cfbd6fa96694f7acf783fa01af7; >= b1af23d836f811137d504d14d4cbdd01929dec34, < 314091243159f8e3749bc719bb129f423f72fd86; >= b1af23d836f811137d504d14d4cbdd01929dec34, < 0b271f7d7f5ed45bc498a03ce0aa9cfd8402fc71
LinuxLinux4.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98282?
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'.
How severe is CVE-2026-98282?
CVE-2026-98282 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98282?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST