Vulnerability in Red Hat Enterprise Linux 10

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3848

  Red Hat Enterprise Linux (sssd, tftp, ansible-collection-ansible-posix): Multiple vulnerabilities Translated from German

  CVE-2026-11837CVE-2026-85234CVE-2026-87853

[ References ]References

• access.redhat.com/errata/RHSA-2026:78952vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:80663vendor-advisoryx_refsource_REDHAT
• access.redhat.com/errata/RHSA-2026:82280vendor-advisoryx_refsource_REDHAT
• access.redhat.com/security/cve/CVE-2026-85234vdb-entryx_refsource_REDHAT
• bugzilla.redhat.com/show_bug.cgiissue-trackingx_refsource_REDHAT
• git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/commit