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CVE-2026-53312: iommu/riscv: Remove overflows on the invalidation path

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-07-06
• Weakness: CWE-835

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/riscv: Remove overflows on the invalidation path Since RISC-V supports a sign extended page table it should support a gather->end of ULONG_MAX, but if this happens it will infinite loop because of the overflow. Also avoid overflow computing the length by moving the +1 to the other side of the <

Affected products

• Linux kernel: from 6.13 before 6.18.33; from 6.19 before 7.0.10 — fixed in 6.18.33, 7.0.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.33, 7.0.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/40a13b49957937427bc23e78eb50679df4396a47
• https://git.kernel.org/stable/c/9f0632b0d4246675fa221aa1a3bffadf9c6bd9ac
• https://git.kernel.org/stable/c/e4b7687784153481de45fd39fb97ba3919605c0c

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