🛡️ CVE-2026-46084 — kernel

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

Description

RDMA/mana_ib: Disable RX steering on RSS QP destroy

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

RDMA/mana_ib: Disable RX steering on RSS QP destroy

When an RSS QP is destroyed (e.g. DPDK exit), mana_ib_destroy_qp_rss()

destroys the RX WQ objects but does not disable vPort RX steering in

firmware. This leaves stale steering configuration that still points to

the destroyed RX objects.

If traffic continues to arrive (e.g. peer VM is still transmitting) and

the VF interface is subsequently brought up (mana_open), the firmware

may deliver completions using stale CQ IDs from the old RX objects.

These CQ IDs can be reused by the ethernet driver for new TX CQs,

causing RX completions to land on TX CQs:

WARNING: mana_poll_tx_cq+0x1b8/0x220 [mana] (is_sq == false)

WARNING: mana_gd_process_eq_events+0x209/0x290 (cq_table lookup fails)

Fix this by disabling vPort RX steering before destroying RX WQ objects.

Note that mana_fence_rqs() cannot be used here because the fence

completion is delivered on the CQ, which is polled by user-mode (e.g.

DPDK) and not visible to the kernel driver.

Refactor the disable logic into a shared mana_disable_vport_rx() in

mana_en, exported for use by mana_ib, replacing the duplicate code.

The ethernet driver's mana_dealloc_queues() is also updated to call

this common function.

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.

Affected software

CVE-2026-46084 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.4)
  • linux-kernel (from 6.19 up to 7.0.4)
  • unknown

Timeline and source

Published on 27 May 2026 and last revised on 15 July 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)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46084 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 2026-05-27
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.4
linux-kernel 6.19 7.0.4
unknown — —

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