CVE-2021-3594

Publication date 15 June 2021

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.8 · Low

Score breakdown

Description

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

Status

Package Ubuntu Release Status
libslirp 24.10 oracular
Fixed 4.6.1-1
24.04 LTS noble
Fixed 4.6.1-1
23.10 mantic
Fixed 4.6.1-1
23.04 lunar
Fixed 4.6.1-1
22.10 kinetic
Fixed 4.6.1-1
22.04 LTS jammy
Fixed 4.6.1-1
21.10 impish
Fixed 4.4.0-1ubuntu0.21.10.1
21.04 hirsute
Fixed 4.4.0-1ubuntu0.1
20.10 groovy
Fixed 4.3.1-1ubuntu0.1
20.04 LTS focal
Fixed 4.1.0-2ubuntu2.2
18.04 LTS bionic Not in release
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Not in release
qemu 24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Fixed 1:2.11+dfsg-1ubuntu7.37
16.04 LTS xenial
Fixed 1:2.5+dfsg-5ubuntu10.51+esm3
14.04 LTS trusty
Fixed 2.0.0+dfsg-2ubuntu1.47+esm4

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libslirp

Severity score breakdown

Parameter Value
Base score 3.8 · Low
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Changed
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references