High [CVE-2026-64153] Fix iommu_map_sgtable return value check and avoid WARN
This high-severity Red Hat Linux advisory covers CVE-2026-64153.
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Summary
In the Linux kernel, the following vulnerability has been resolved: drm/msm: Fix iommu_map_sgtable() return value check and avoid WARN Commit "iommu: return full error code from iommu_map_sg[_atomic]()" changed iommu_map_sgtable() to return an ssize_t and negative values in error cases, rather than a size_t and a zero.
Store the return value in the appropriate type and in case of error, return it rather than WARNing. Patchwork: A flaw was found in the `drm/msm` (Direct Rendering Manager / Qualcomm MSM) driver within the Linux kernel.
This vulnerability arises from an incorrect handling of return values in the `iommu_map_sgtable()` function. Previously, the function would trigger a warning instead of properly returning an error when an IOMMU (Input/Output Memory Management Unit) mapping operation failed.
This could lead to system instability or unexpected behavior, potentially resulting in a denial of service. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).
Weakness: CWE-253. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- No mitigation is required as the vulnerable code is not present in Red Hat Enterprise Linux and Red Hat In-Vehicle OS.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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