Answer in brief
CVE-2026-89819 records a High severity (CVSS 7.8) vulnerability in drm/amd/display: validate plane degamma LUT size for private color prop. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=980f8710075acaeb226a94cde6dda8ffad30123c <f6f04d8ae5725bcc893bdc62e3467efd97255c5b || >=980f8710075acaeb226a94cde6dda8ffad30123c <0b2615b8b54f58bbdf986dffb38cbc35214a5cc5 || >=980f8710075acaeb226a94cde6dda8ffad30123c <b10cc09b329245c6d95f8fa3e7f068575e3e0e9f || >=980f8710075acaeb226a94cde6dda8ffad30123c <e4c3ab59021e7c146a84b6671f0d530972bd58b4 | f6f04d8ae5725bcc893bdc62e3467efd97255c5b, 0b2615b8b54f58bbdf986dffb38cbc35214a5cc5, b10cc09b329245c6d95f8fa3e7f068575e3e0e9f, e4c3ab59021e7c146a84b6671f0d530972bd58b4 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: validate plane degamma LUT size for private color prop Unlike the CRTC degamma path, which is guarded by amdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never validated before use. __set_dm_plane_degamma() passed the user-supplied size straight into __is_lut_linear() and, for a non-linear LUT, into __set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating MAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size. A malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus trigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in __drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not match MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already asserts a few lines below (and which the CRTC path enforces). The AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with AMD_PRIVATE_COLOR defined.
Quoted source text, attributed separately from HOL analysis.