High [CVE-2026-70458] Memory corruption via crafted file entries
This high-severity Red Hat Linux advisory covers CVE-2026-70458 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.
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Summary
rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-link preservation option is inactive.
Attackers can exploit the missing F_SUM field in the file_struct layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data. A flaw was found in rsync.
This can lead to denial of service or other unpredictable system behavior. This Important out-of-bounds write vulnerability in rsync can lead to memory corruption when processing specially crafted file entries, potentially resulting in a denial of service.
The flaw is triggered when hard-link preservation is inactive, allowing a remote attacker to exploit it without requiring user interaction or elevated privileges. Red Hat severity: Important — CVSS 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.
Red Hat fixing advisory: RHSA-2026:67463, RHSA-2026:67462.
Affected products named by the advisory: Red Hat package: rsync.
- < 3.0.0
- < 3.5.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 3.5.0
- rsync-0:3.5.0-3.el10_2
- rsync-0:3.2.7-1.el9_8
- RHSA-2026:67463
- RHSA-2026:67462
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- Disable the rsyncd daemon if unused (systemctl disable --now rsyncd), or strictly limit TCP/873 access to trusted clients via firewall rules. For daemons that must remain active, explicitly set refuse options = checksum in rsyncd.conf to block the demonstrated out-of-bounds write vector. Finally, when operating as a client pulling from untrusted peers, always append the --hard-links (-H) flag to force safe memory allocation and prevent corruption.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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