Linux Kernel up to 5.19.3 apparmor aa_pivotroot reference count

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 5.19.3. This affects the function aa_pivotroot of the component apparmor. The manipulation leads to reference count. This vulnerability is uniquely identified as CVE-2022-50077. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.19.3 and classified as critical. This issue affects the function aa_pivotroot of the component apparmor. The manipulation with an unknown input leads to a reference count vulnerability. Using CWE to declare the problem leads to CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix reference count leak in aa_pivotroot() The aa_pivotroot() function has a reference counting bug in a specific path. When aa_replace_current_label() returns on success, the function forgets to decrement the reference count of “target”, which is increased earlier by build_pivotroot(), causing a reference leak. Fix it by decreasing the refcount of “target” in that path.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2022-50077 since 06/18/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 271309 (EulerOS 2.0 SP13 : kernel (EulerOS-SA-2025-2264)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.291, 4.19.256, 5.4.211, 5.10.138, 5.15.63 or 5.19.4 eliminates this vulnerability. Applying the patch d53194707d2a1851be027cd74266b96ceff799d3/f4d5c7796571624e3f380b447ada52834270a287/ef6fb6f0d0d8440595b45a7e53c6162c737177f4/2ceeb3296e9dde1d5772348046affcefdea605e2/64103ea357734b82384c925cba4758fdb909be0c/3ca40ad7afae144169a43988ef1a3f16182faf0a/11c3627ec6b56c1525013f336f41b79a983b4d46 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 (271309) and CERT Bund (WID-SEC-2025-1350). 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
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Avamar
  • Dell NetWorker
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Reference count
CWE: CWE-911 / CWE-664
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: 271309
Nessus Name: EulerOS 2.0 SP13 : kernel (EulerOS-SA-2025-2264)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.291/4.19.256/5.4.211/5.10.138/5.15.63/5.19.4
Patch: d53194707d2a1851be027cd74266b96ceff799d3/f4d5c7796571624e3f380b447ada52834270a287/ef6fb6f0d0d8440595b45a7e53c6162c737177f4/2ceeb3296e9dde1d5772348046affcefdea605e2/64103ea357734b82384c925cba4758fdb909be0c/3ca40ad7afae144169a43988ef1a3f16182faf0a/11c3627ec6b56c1525013f336f41b79a983b4d46

Timelineinfo

06/18/2025 Advisory disclosed
06/18/2025 +0 days CVE reserved
06/18/2025 +0 days VulDB entry created
11/30/2025 +165 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2022-50077 (🔒)
GCVE (CVE): GCVE-0-2022-50077
GCVE (VulDB): GCVE-100-313007
CERT Bund: WID-SEC-2025-1350 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 06/18/2025 14:57
Updated: 11/30/2025 22:52
Changes: 06/18/2025 14:57 (59), 07/30/2025 09:26 (7), 10/19/2025 09:20 (1), 10/25/2025 22:14 (2), 11/18/2025 00:44 (11), 11/30/2025 22:52 (1)
Complete: 🔍
Cache ID: 216::103

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

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