CVE-2026-46153
Analyzed Analyzed - Analysis Complete
VLAN Egress Priority Mapping Memory Leak in Linux Kernel

Publication date: 2026-05-28

Last updated on: 2026-06-09

Assigner: kernel.org

Description
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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-28
Last Modified
2026-06-09
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46153
EUVD
EUVD-2026-32780
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel 2.6.12
linux linux_kernel From 2.6.12.1 (inc) to 7.0.7 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in the Linux kernel's 8021q module, specifically in the function vlan_dev_set_egress_priority(). The function currently retains cleared egress priority mappings as tombstones in a hash table. When there are repeated set and clear operations with different skb priorities, these mapping nodes accumulate over time until the device is torn down, causing a memory leak.

The fix involves deleting the mappings when the vlan_prio is cleared instead of keeping tombstones. Since the egress mapping lists are now protected by RCU (Read-Copy-Update), the nodes can be safely unlinked and freed after a grace period, preventing the memory leak.

Impact Analysis

This vulnerability can lead to a memory leak in the Linux kernel when the affected function repeatedly sets and clears egress priority mappings. Over time, this memory leak can consume system resources, potentially degrading system performance or causing instability until the device is torn down.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-46153. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart