CVE-2022-49921: net: sched: Fix use after free in red_enqueue()
First published: Thu May 01 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net: sched: Fix use after free in red_enqueue() We can't use "skb" again after passing it to qdisc_enqueue(). This is basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb len before calling child enqueue").
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619
- https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db
- https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a
- https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2
- https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36
- https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa
- https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e
- https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
Frequently Asked Questions
What is the severity of CVE-2022-49921?
CVE-2022-49921 has been assigned a medium severity rating due to its potential impact on network scheduling functionality.
How do I fix CVE-2022-49921?
To fix CVE-2022-49921, update the Linux kernel to the latest stable version where this vulnerability has been patched.
Which versions of the Linux kernel are affected by CVE-2022-49921?
CVE-2022-49921 affects specific versions of the Linux kernel that utilize the vulnerable red_enqueue() function.
What are the implications of CVE-2022-49921 for system security?
CVE-2022-49921 could lead to use-after-free vulnerabilities in network scheduling, potentially compromising system stability and security.
Is there a workaround for CVE-2022-49921?
While updating is the recommended fix for CVE-2022-49921, no official workarounds have been provided.
- collector/mitre-cve
- source/MITRE
- agent/title
- agent/weakness
- agent/references
- agent/type
- agent/first-publish-date
- agent/description
- agent/guess-ai
- agent/software-canonical-lookup
- agent/softwarecombine
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- agent/author
- agent/source
- agent/tags
- agent/event
- vendor/linux
- canonical/linux kernel