Linux Kernel up to 5.15.10 rebalance_children use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 5.15.10. Affected is the function rebalance_children. Performing a manipulation results in use after free. This vulnerability was named CVE-2021-47600. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 5.15.10. This affects the function rebalance_children. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: dm btree remove: fix use after free in rebalance_children() Move dm_tm_unlock() after dm_tm_dec().

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2021-47600 since 05/24/2024. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/04/2025).

The vulnerability scanner Nessus provides a plugin with the ID 209962 (SUSE SLES15 Security Update : kernel (Live Patch 44 for SLE 15 SP2) (SUSE-SU-2024:3767-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.4.296, 4.9.294, 4.14.259, 4.19.222, 5.4.168, 5.10.88 or 5.15.11 eliminates this vulnerability. Applying the patch a48f6a2bf337/66ea642af6fd/b03abd0aa09c/293f957be5e3/501ecd90efdc/0e21e6cd5eeb/607beb420b3f/1b8d2789dad0 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (209962) and CERT Bund (WID-SEC-2024-1418). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • IBM InfoSphere Guardium
  • Oracle Linux
  • Oracle VM
  • IBM Security Guardium
  • RESF Rocky Linux
  • Broadcom Brocade SANnav
  • Dell NetWorker
  • Open Source Linux Kernel
  • IBM QRadar SIEM
  • Dell Avamar
  • IBM Storage Scale
  • Juniper Junos Space
  • SolarWinds Security Event Manager
  • Dell PowerProtect Data Domain

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 209962
Nessus Name: SUSE SLES15 Security Update : kernel (Live Patch 44 for SLE 15 SP2) (SUSE-SU-2024:3767-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.4.296/4.9.294/4.14.259/4.19.222/5.4.168/5.10.88/5.15.11
Patch: a48f6a2bf337/66ea642af6fd/b03abd0aa09c/293f957be5e3/501ecd90efdc/0e21e6cd5eeb/607beb420b3f/1b8d2789dad0

Timelineinfo

05/24/2024 🔍
06/19/2024 +26 days 🔍
06/19/2024 +0 days 🔍
10/04/2025 +472 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-47600 (🔍)
GCVE (CVE): GCVE-0-2021-47600
GCVE (VulDB): GCVE-100-269103
CERT Bund: WID-SEC-2024-1418 - Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 06/19/2024 18:04
Updated: 10/04/2025 09:30
Changes: 06/19/2024 18:04 (56), 08/28/2024 02:34 (13), 10/31/2024 12:50 (2), 10/04/2025 09:30 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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