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CVE-2023-50711

27
FAUCET Score

CVE-2023-50711 is a critical out-of-bounds memory access vulnerability affecting rust-vmm vmm-sys-util versions 0.5.0 through 0.11.x. The flaw resides in the FamStructWrapper::deserialize implementation, which fails to validate that the header's stored length matches the flexible array length, potentially allowing attackers to trigger out-of-bounds memory access through Rust-safe methods. With a CVSS score of 9.8 (CRITICAL), this vulnerability is remotely exploitable with low attack complexity and can lead to high impacts on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.5.0, < 0.12.0CPE matchmatch criteria
cpe:2.3:a:rust-vmm:vmm-sys-util:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

5.7MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.5
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.65%
Probability of exploitation in next 30 days
EPSS Percentile
47.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0065 is in the 29th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (14)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 19768-17086Fixed in: 32.0-3
microsoftpatch availablevia msrc
Product: 18195-16823Fixed in: 32.0-3
microsoftpatch availablevia msrc
Product: 19700-17086Fixed in: 3.2.0.azl2-1
microsoftpatch availablevia msrc
Product: 19695-17086Fixed in: 3.2.0.azl2-1
microsoftpatch availablevia msrc
Product: 19788-17084Fixed in: 3.15.0.aks0-1
microsoftpatch availablevia msrc
Product: 19795-17084Fixed in: 3.15.0.aks0-1
microsoftpatch availablevia msrc
Product: cbl2 cloud-hypervisor 32.0-6 on CBL Mariner 2.0Fixed in: 32.0-3
microsoftpatch availablevia msrc
Product: cbl2 cloud-hypervisor 32.0-3 on CBL Mariner 2.0Fixed in: 32.0-3
microsoftpatch availablevia msrc
Product: cbl2 kata-containers-cc 3.2.0.azl2-6 on CBL Mariner 2.0Fixed in: 3.2.0.azl2-1
microsoftpatch availablevia msrc
Product: cbl2 kata-containers 3.2.0.azl2-6 on CBL Mariner 2.0Fixed in: 3.2.0.azl2-1
microsoftpatch availablevia msrc
Product: azl3 kata-containers 3.2.0.azl5-2 on Azure Linux 3.0Fixed in: 3.15.0.aks0-1
microsoftpatch availablevia msrc
Product: azl3 kata-containers-cc 3.2.0.azl5-2 on Azure Linux 3.0Fixed in: 3.15.0.aks0-1
rustpatch availablevia ghsa
Product: vmm-sys-utilFixed in: 0.12.0

Vendor Advisories (2)

microsoft2024-Jan/CVE-2023-50711Critical

`serde` deserialization for `FamStructWrapper` lacks bound checks that could potentially lead to out-of-bounds memory access

Jan 9, 2024
rustGHSA-875g-mfp6-g7f9medium

`serde` deserialization for `FamStructWrapper` lacks bound checks that could potentially lead to out-of-bounds memory access

Jan 2, 2024

References

github.com / rust-vmm/vmm-sys-util/commit/30172fca2a8e0a38667d934ee56682247e13f167
Patch
github.com / rust-vmm/vmm-sys-util/security/advisories/GHSA-875g-mfp6-g7f9
Vendor Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/W5XMCLV2P3ANS3XN4NXZTV4PUNTLWUNJ
lists.fedoraproject.org / archives/list/[email protected]/message/YJI7D273R6G5RUC246KTI2YY3AXZKZMD