# CVE-2026-53172: linux: In the Linux kernel, the following vulnerability has been resolved:  accel/ethosu: fix IFM region index out-of-bounds...

CVE-2026-53172 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53172 (version 7.0.13-1), released June 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53172
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  accel/ethosu: fix IFM region index out-of-bounds in command stream parser  NPU_SET_IFM_REGION extracts the region index with param & 0x7f, giving a maximum value of 127. However region_size[] and output_region[] in struct ethosu_validated_cmdstream_info are both sized to NPU_BASEP_REGION_MAX (8), giving valid indices [0..7].  Every other region assignment in the same switch uses param & 0x7:   NPU_SET_OFM_REGION:  st.ofm.region  = param & 0x7;   NPU_SET_IFM2_REGION: st.ifm2.region = param & 0x7;   NPU_SET_WEIGHT_REGION: st.weight[0].region = param & 0x7;   NPU_SET_SCALE_REGION:  st.scale[0].region  = param & 0x7;  The 0x7f mask on IFM is inconsistent and appears to be a typo.  feat_matrix_length() and calc_sizes() use the region index directly as an array subscript into the kzalloc'd info struct:   info->region_size[fm->region] = max(...);  A userspace caller supplying NPU_SET_IFM_REGION with param > 7 causes a write up to 127*8 = 1016 bytes past the start of region_size[], corrupting adjacent kernel heap data.  Fix by applying the same & 0x7 mask used by all other region assignments.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53172](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53172.md) | Jun 28, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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