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🛡️ CVE-2026-46176 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2026-46176 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 7.0.7)
  • linux-kernel

Timeline and source

Published on 28 May 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
security.access.redhat.com (Web)
access.redhat.com (Advisory)
access.redhat.com (Advisory)
access.redhat.com (Advisory)
access.redhat.com (Advisory)
access.redhat.com (Advisory)
github.com (Advisory)
nvd.nist.gov (Advisory)
bugzilla.redhat.com (Report)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2026-46176 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-28
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.13.0 7.0.7
linux-kernel — —

References

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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