Bug 2562666 (CVE-2026-99118) - CVE-2026-99118 kernel: drm/i915/dmc: Harden DMC firmware payload parsing
Summary: CVE-2026-99118 kernel: drm/i915/dmc: Harden DMC firmware payload parsing
Keywords:
Status: NEW
Alias: CVE-2026-99118
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-28 10:46 UTC by OSIDB Bzimport
Modified: 2026-10-28 18:22 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-10-28 10:46:08 UTC 
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)
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