# CVE-2026-53173: linux: In the Linux kernel, the following vulnerability has been resolved:  accel/ethosu: fix OOB write in ethosu_gem_cmdstr...

CVE-2026-53173 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53173 (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-2026-53173
- 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 OOB write in ethosu_gem_cmdstream_copy_and_validate()  The command stream parsing loop increments the index variable a second time when a 64-bit command word is encountered (bit 14 set), but does not re-check the loop bound before writing the second word:      for (i = 0; i < size / 4; i++) {         bocmds[i] = cmds[0];         if (cmd & 0x4000) {             i++;             bocmds[i] = cmds[1];   /* unchecked */         }     }  The buffer bocmds is backed by a DMA allocation of exactly size bytes from drm_gem_dma_create(ddev, size), giving valid indices [0, size/4-1].  When i == size/4 - 1 on entry to an iteration and bit 14 of cmds[0] is set, bocmds[size/4-1] is written in bounds, i is then incremented to size/4, and bocmds[size/4] writes four bytes past the end of the allocation.  Userspace controls both the buffer contents and the size argument via the ioctl, making this a userspace-triggerable heap out-of-bounds write.  Fix by checking the incremented index against the buffer bound before the second write and returning -EINVAL if the buffer is too small to contain the extended command.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53173](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53173.md) | Jun 28, 2026 |

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