Description
A flaw was found in tftp-hpa. When the `in.tftpd` remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Red Hat Red Hat Enterprise Linux 10
Default version status: affected
0:5.2-50.el10_2 to < *unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: affected
0:5.2-28.el8_10 to < *unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: affected
0:5.2-40.el9_8.1 to < *unaffected
Red Hat Red Hat Enterprise Linux 6
Default version status: unknown
Red Hat Red Hat Enterprise Linux 7
Default version status: affected
Red Hat Red Hat Hardened Images
Default version status: unaffected
References
- https://access.redhat.com/errata/RHSA-2026:78952 ↗
- https://access.redhat.com/errata/RHSA-2026:80663 ↗
- https://access.redhat.com/errata/RHSA-2026:82280 ↗
- https://access.redhat.com/security/cve/CVE-2026-85234 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2460997 ↗
- https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/commit/?id=4b493532f5ce052a1c124acd0661233ec7918327 ↗