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Review reviewHigh

CVE-2026-64153

Linux

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: https://patchwork.freedesktop.org/patch/719685/

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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: https://patchwork.freedesktop.org/patch/719685/

Affected product and versions

Product
Linux
Affected versions
>= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 3c2cdb7c07f664b77e2a75b50793b845d5742efa, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 3e3c3c95ef4fe17231a9149e27bcfc9dae2dd89f, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 7256e54583aee21e23929e7554278c2f5c1a08b1, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 3457807aeb88077712f0a7cb65c3ca5120773d75, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < f4e37f3df436c2bdd2621c21f9c72c8f149a221d, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 3a45af37733446e114bf19b0209fe7d8089bdb8b, >= ad8f36e4b6b1c826a0daa5fda2c5839205b5aa8b < 55e0f0d1c1a4ee1e46da7da4d443eb3044fb3851, >= 5.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
Not available
CVE-2026-64153 — Linux | SECUFOCUS NOW