# CVE-2026-46176

## Summary

- **CVE ID:** CVE-2026-46176
- **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:** May 28, 2026
- **Last Modified:** Sep 15, 2026

## Description

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

RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()

mlx5_ib_dev_res_srq_init() allocates two SRQs, s0 and s1. When
ib_create_srq() fails for s1, the error branch destroys s0 but falls
through and unconditionally assigns the freed s0 and the ERR_PTR s1 to
devr->s0 and devr->s1.

This leads to several problems: the lock-free fast path checks
"if (devr->s1) return 0;" and treats the ERR_PTR as already initialised;
users in mlx5_ib_create_qp() dereference the freed SRQ or ERR_PTR via
to_msrq(devr->s0)->msrq.srqn; and mlx5_ib_dev_res_cleanup() dereferences
the ERR_PTR and double-frees s0 on teardown.

Fix by adding the same `goto unlock` in the s1 failure path.

## Affected Products

- Linux — Linux (b6334d2356fc0922ed01457960f74923058a353a)
- Linux — Linux (5895e70f2e6e8dc67b551ca554d6fcde0a7f0467)
- Linux — Linux (6.6.64)
- Linux — Linux (6.11)
- Linux — Linux (0)
- Linux — Linux (6.6.140)
- Linux — Linux (6.12.88)
- Linux — Linux (6.18.30)
- Linux — Linux (7.0.7)
- Linux — Linux (7.1-rc3)
- Linux — Linux (7.1)

## References

- [CNA](https://git.kernel.org/stable/c/a13c2ac4d480b734342c6fbf8249fc48afd675f3)
- [CNA](https://git.kernel.org/stable/c/bc2cf5935b4665172235341163315905197ae91d)
- [CNA](https://git.kernel.org/stable/c/b087913ae88256df66620f7ba0a9776716aeef7e)
- [CNA](https://git.kernel.org/stable/c/6fd93142dd1d09000c3750af08270f5792523fe9)
- [CNA](https://git.kernel.org/stable/c/c488df06bd552bb8b6e14fa0cfd5ad986c6e9525)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-46176)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2482594)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46176.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:33215)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:30848)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:33685)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:34094)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.8

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