Linux Kernel up to 4.19.219/5.4.163/5.10.83/5.15.6 rxrpc_lookup_peer memory leak

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.5$0-$5k0.00

A vulnerability classified as critical has been found in Linux Kernel up to 4.19.219/5.4.163/5.10.83/5.15.6. Affected is the function rxrpc_lookup_peer. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() Need to call rxrpc_put_local() for peer candidate before kfree() as it holds a ref to rxrpc_local. [DH: v2: Changed to abstract the peer freeing code out into a function]

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2021-47538 since 05/24/2024. The exploitability is told to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/24/2024).

Upgrading to version 4.19.220, 5.4.164, 5.10.84 or 5.15.7 eliminates this vulnerability. Applying the patch 913c24af2d13/3e70e3a72d80/60f0b9c42cb8/9469273e616c/beacff50edbd 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.

Similar entries are available at VDB-267464, VDB-267465, VDB-267466 and VDB-267467.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔒
VulDB CVSS-BT Score: 🔒
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

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

CVSSv2info

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.19.220/5.4.164/5.10.84/5.15.7
Patch: 913c24af2d13/3e70e3a72d80/60f0b9c42cb8/9469273e616c/beacff50edbd

Timelineinfo

05/24/2024 Advisory disclosed
05/24/2024 +0 days CVE reserved
05/24/2024 +0 days VulDB entry created
05/24/2024 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-47538 (🔒)
See also: 🔒

Entryinfo

Created: 05/24/2024 06:45 PM
Changes: 05/24/2024 06:45 PM (57)
Complete: 🔍
Cache ID: 3:3EB:40

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