Medium [CVE-2026-53792] Denial of Service via out-of-bounds read with crafted checksum block
This medium-severity Red Hat Linux advisory covers CVE-2026-53792 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
rsync before 3.5.0 contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero.
Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side. A flaw was found in rsync.
This can lead to a denial of service on the sender side. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-129. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: rsync.
- < 3.5.0
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Disable unused rsyncd services (systemctl disable --now rsyncd), and if actively serving files, restrict port 873 to trusted clients to prevent untrusted pull requests from crashing the daemon. When operating as a client, only push data (rsync src/ host:dst/) to fully trusted receivers, as the out-of-bounds read is triggered by the receiving end.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.