CVE-2026-68206
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Linux kernel, in the V4L2 control mechanism (v4l2-ctrls), there is a lack of validation for active L0/L1 reference counts for HEVC slice parameters. The common validation path does not verify these values before driver-specific code consumes them, which can lead to incorrect behavior.
Risk Assessment
Lack of validation may allow stateless HEVC drivers to process invalid data, potentially leading to crashes or unpredictable system behavior.
Recommendation
Apply the Linux kernel patch that adds validation of active reference counts in the common HEVC slice control path to ensure basic safety guarantees.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-ctrls: validate HEVC active reference counts HEVC slice parameters are shared stateless V4L2 controls, but the common validation path does not verify the active L0/L1 reference counts before driver-specific code consumes them. The original report came from Cedrus, but the active count bounds are not Cedrus-specific. Validate them in the common HEVC slice control path so stateless HEVC drivers get the same basic guarantees as soon as the control is queued. Do not reject ref_idx_l0/ref_idx_l1 entries here. Existing userspace may use out-of-range sentinel values such as 0xff for missing references, and some hardware can use that information for concealment. Keep this common check limited to the active reference counts.