Bug 2491822 (CVE-2026-56115) - CVE-2026-56115 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 ADVERTISE message
Summary: CVE-2026-56115 dhcpcd: dhcpcd: Denial of Service via crafted DHCPv6 ADVERTISE...
Keywords:
Status: NEW
Alias: CVE-2026-56115
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2492038 2492039
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-23 17:03 UTC by OSIDB Bzimport
Modified: 2026-06-23 22:46 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-06-23 17:03:48 UTC 
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.
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