CVE-2024-12085: Rsync: info leak via uninitialized stack contents

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 8.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-01-14 · updated 2026-10-13
Weakness: CWE-908

Description

A flaw was found in rsync which could be triggered when rsync compares file checksums. This flaw allows an attacker to manipulate the checksum length (s2length) to cause a comparison between a checksum and uninitialized memory and leak one byte of uninitialized stack data at a time.

Affected products

Almalinux: 8.0, 9.0, 10.0
Archlinux Arch Linux: all versions
gentoo Linux: all versions
Nixos: before 24.11 — fixed in 24.11
Red Hat Enterprise Linux: 8.0, 9.0
RedHat Enterprise Linux Eus: 8.8, 9.2, 9.4, 9.6
RedHat Enterprise Linux For Arm 64: 8.0_aarch64, 9.0_aarch64, 9.2_aarch64
RedHat Enterprise Linux For Arm 64 Eus: 8.8_aarch64, 9.4_aarch64, 9.6_aarch64
RedHat Enterprise Linux For Ibm Z Systems: 8.0_s390x, 9.0_s390x, 9.2_s390x
RedHat Enterprise Linux For Ibm Z Systems Eus: 8.8_s390x, 9.4_s390x, 9.6_s390x
RedHat Enterprise Linux For Power Little Endian: 8.0_ppc64le, 8.8_ppc64le, 9.0_ppc64le, 9.2_ppc64le
RedHat Enterprise Linux For Power Little Endian Eus: 9.4_ppc64le, 9.6_ppc64le
RedHat Enterprise Linux Server: 6.0, 7.0
RedHat Enterprise Linux Server Aus: 8.2, 8.4, 8.6, 9.2, 9.4, 9.6
RedHat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions: 8.4_ppc64le, 8.6_ppc64le, 8.8_ppc64le, 9.0_ppc64le, 9.2_ppc64le, 9.4_ppc64le (+1)
RedHat Enterprise Linux Server Tus: 8.4, 8.6, 8.8
RedHat Enterprise Linux Update Services For Sap Solutions: 8.4, 8.6, 9.0, 9.2, 9.6
Openshift: 5.0
Red Hat OpenShift Container Platform 4.18: 4.12, 4.13, 4.14, 4.15, 4.16, 4.17
RsyncProject rsync: before 3.3.0 — fixed in 3.3.0
Suse Linux: all versions
Tritondatacenter Smartos: before 20250123 — fixed in 20250123

How to fix

Upgrade to a fixed version: Nixos 24.11; RsyncProject rsync 3.3.0; Tritondatacenter Smartos 20250123. Check the vendor advisory for mitigations.

References

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