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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2022-48809 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 Patch 
https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a Patch 
https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 Patch 
https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108 Patch 
https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613 Patch 
https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 Patch 
https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540 Patch 
https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-401 Missing Release of Memory after Effective Lifetime cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2022-48809
NVD Published Date:
07/16/2024
NVD Last Modified:
08/07/2024
Source:
kernel.org