# CVE-2026-74334

## Summary

- **CVE ID:** CVE-2026-74334
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Aug 15, 2026
- **Last Modified:** Sep 14, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/nldev: Fix locking when accessing mr->pd

Sashiko points out that, due to rereg_mr, the PD is actually variable and
all the touches in nldev are racy.

Use mr->device instead of mr->pd->device.

Getting the PD restrack ID is more tricky. To avoid disturbing all the
happy paths, add an rdma_restrack_sync() operation which is sort of like
flush_workqueue() or synchronize_irq(): after it returns, all the old
nldev touches to the mr are gone and everything sees the new PD. This
makes it safe to reach into the PD pointer.

## Affected Products

- Linux — Linux (da5c8507821573b8ed6e3f47e009f273493ffaf7)
- Linux — Linux (4.18)
- Linux — Linux (0)
- Linux — Linux (7.1.5)
- Linux — Linux (7.2-rc1)
- Linux — Linux (7.2)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)
- Linux — Linux (6.12.110)
- Linux — Linux (6.18.52)

## References

- [CNA](https://git.kernel.org/stable/c/1a132ee4e655288d9a0937ea5109a0d038431ae9)
- [CNA](https://git.kernel.org/stable/c/50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3)
- [CNA](https://git.kernel.org/stable/c/845c6b355226195dad1f26b300c4830f57034e8b)
- [CNA](https://git.kernel.org/stable/c/7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a)
- [CNA](https://git.kernel.org/stable/c/05e26f34597e9c38bb5b340d86b179b23673869f)
- [CNA](https://git.kernel.org/stable/c/a07cba1296aaa81bf9b914486ca957aaff196247)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._