---
id: CVE-2026-46153
title: '8021q: delete cleared egress QoS mappings'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  8021q: delete cleared egress QoS mappings

  vlan_dev_set_egress_priority() currently keeps cleared egress
  priority mappings in the hash as tombstones. Repeated set/clear…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a52e122c9e4d56ad9a03b32c915a199276d989c3
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7dddc74af369478ba7f9bc136d0fc1dc4570cb66
  - Linux 2.6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:10:11.587690Z'
published: '2026-05-28'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:13:41.502Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46153'
references:
  - url: 'https://git.kernel.org/stable/c/a52e122c9e4d56ad9a03b32c915a199276d989c3'
  - url: 'https://git.kernel.org/stable/c/7dddc74af369478ba7f9bc136d0fc1dc4570cb66'
tags:
  - cve.org
epss: 0.00112
epssPercentile: 0.01387
ingestedAt: '2026-11-06T16:57:43.330Z'
---

## Overview

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

8021q: delete cleared egress QoS mappings

vlan_dev_set_egress_priority() currently keeps cleared egress
priority mappings in the hash as tombstones. Repeated set/clear cycles
with distinct skb priorities therefore accumulate mapping nodes until
device teardown and leak memory.

Delete mappings when vlan_prio is cleared instead of keeping tombstones.
Now that the egress mapping lists are RCU protected, the node can be
unlinked safely and freed after a grace period.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a52e122c9e4d56ad9a03b32c915a199276d989c3`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7dddc74af369478ba7f9bc136d0fc1dc4570cb66`
- `Linux 2.6.12`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.