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Vulnerability record · CVE-2026-46176 · published 28 May 2026

CVE-2026-46176: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.2% CWE-825 · CWE-825
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-46176), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.