EUVD-2026-39847
GHSA-h2cq-p42h-rq44
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local-only trigger on RISC-V IOMMU hardware requiring low privileges; no confidentiality or integrity impact, high availability loss from kernel hang.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionNVD
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 <
AnalysisAI
Integer overflow on the RISC-V IOMMU invalidation path in the Linux kernel triggers an infinite loop, causing a local denial of service. A low-privileged local user on an affected RISC-V system with IOMMU hardware can hang the kernel by inducing an invalidation where gather->end equals ULONG_MAX, exploiting the sign-extended page table range supported by RISC-V. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following: (1) the target must be a RISC-V architecture CPU - no other architecture is affected; (2) IOMMU hardware must be present and the RISC-V IOMMU kernel driver must be active; (3) the attacker must have local execution with at least low-privilege credentials (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) accurately reflects the threat profile: local access with low privileges is sufficient to hang the kernel, but the attack surface is constrained to RISC-V hardware with IOMMU. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged local user on a RISC-V server or embedded platform with IOMMU hardware triggers an IOMMU TLB invalidation operation with a gather range endpoint of ULONG_MAX, exploiting the sign-extended address space. The kernel's invalidation loop overflows its length computation and spins indefinitely in kernel context, consuming all CPU time and hanging the system with no recovery path short of a hard reset. … |
| Remediation | Update to Linux kernel 7.0.10, 6.18.33, or 7.1 or later, which incorporate upstream commits 9f0632b0d4246675fa221aa1a3bffadf9c6bd9ac, e4b7687784153481de45fd39fb97ba3919605c0c, and 40a13b49957937427bc23e78eb50679df4396a47 via https://git.kernel.org/stable/c/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Denial Of Service
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External POC / Exploit Code
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