Vulnerability in Linux

[ Description ]Official 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'.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3743

  Linux Kernel: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-98221CVE-2026-98181CVE-2026-98248+204 more CVEs

[ References ]References

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