Bug 2481349 - CVE-2026-5947 dhcp: SIG(0) validation during query flood may lead to undefined behavior [fedora-all]
Summary: CVE-2026-5947 dhcp: SIG(0) validation during query flood may lead to undefine...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: dhcp
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Martin Osvald 🛹
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["1722d21e-e8ce-4a9a-86bb-1...
Depends On:
Blocks: CVE-2026-5947
TreeView+ depends on / blocked
 
Reported: 2026-05-26 03:46 UTC by Sandipan Roy
Modified: 2026-05-28 05:49 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-05-28 05:49:13 UTC
Type: ---
Embargoed:

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Description Sandipan Roy 2026-05-26 03:46:50 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Comment 1 Martin Osvald 🛹 2026-05-28 05:49:13 UTC 
ISC DHCP is not affected. It doesn't perform SIG(0) validation or process any DNS messages that can lead to this. This is a BIND server-side issue.

ISC DHCP uses portions of the ISC BIND libraries (primarily libdns, omapi, and libisccfg) only to support DDNS (TSIG support, DNS message construction/parsing, DHCID generation), OMAPI related operations, basic functions (configuration handling, data structures, logging, networking primitives).
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