CVE-2022-49921 - Vulnerability Details

- net: sched: Fix use after free in red_enqueue()

Description

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").

Published: 2025-05-01

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< 795afe0b9bb6c915f0299a8e309936519be01619
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< a238cdcf2bdc72207c74375fc8be13ee549ca9db
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< e877f8fa49fbccc63cb2df2e9179bddc695b825a
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< 52e0429471976785c155bfbf51d80990c6cd46e2
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< 5960b9081baca85cc7dcb14aec1de85999ea9d36
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< fc4b50adb400ee5ec527a04073174e8e73a139fa
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< 170e5317042c302777ed6d59fdb84af9b0219d4e
`d7f4f332f082c4d4ba53582f902ed6b44fd6f45e`	affected	< 8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
`ab0b3b9dbf559a5633d460e748144697bd2d3aa3`	affected	—

Linux

affected

Version	Status	Constraints
`4.7`	affected	—
`0`	unaffected	< 4.7
`4.9.333`	unaffected	≤ 4.9.*
`4.14.299`	unaffected	≤ 4.14.*
`4.19.265`	unaffected	≤ 4.19.*
`5.4.224`	unaffected	≤ 5.4.*
`5.10.154`	unaffected	≤ 5.10.*
`5.15.78`	unaffected	≤ 5.15.*
`6.0.8`	unaffected	≤ 6.0.*
`6.1`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2025-12857	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").

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00064.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e
https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2
https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36
https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619
https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9
https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db
https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a
https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa
https://lore.kernel.org/linux-cve-announce/2025050108-CVE-2022-49921-e4fc@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49921
https://www.cve.org/CVERecord?id=CVE-2022-49921

History

Wed, 01 Oct 2025 15:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 11 Jun 2025 14:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-681
Metrics	threat_severity `Important`	threat_severity `Moderate`

Sat, 07 Jun 2025 03:00:00 +0000

Type	Values Removed	Values Added
Metrics	threat_severity `Moderate`	threat_severity `Important`

Wed, 07 May 2025 13:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		CWE-416
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.1:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::
Vendors & Products		Linux Linux linux Kernel
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Fri, 02 May 2025 14:00:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025050108-CVE-2022-49921-e4fc@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2022-49921 https://www.cve.org/CVERecord?id=CVE-2022-49921
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Thu, 01 May 2025 14:30:00 +0000

Type	Values Removed	Values Added
Description		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").
Title		net: sched: Fix use after free in red_enqueue()
References		https://git.kernel.org/stable/c/170e5317042c302777ed6d59fdb84af9b0219d4e https://git.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2 https://git.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36 https://git.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619 https://git.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9 https://git.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9db https://git.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825a https://git.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-05-01T14:11:00.309Z

Updated: 2026-05-11T19:09:17.322Z

Reserved: 2025-05-01T14:05:17.252Z

Link: CVE-2022-49921

Vulnrichment

Updated: 2025-10-01T14:18:38.221Z

NVD

Status : Modified

Published: 2025-05-01T15:16:17.627

Modified: 2025-10-01T15:15:36.147

Link: CVE-2022-49921

Redhat

Severity : Moderate

Publid Date: 2025-05-01T00:00:00Z

Links: CVE-2022-49921 - Bugzilla

OpenCVE Enrichment

No data.

Weaknesses

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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