CVE-2013-4563
The udp6_ufo_fragment function in net/ipv6/udp_offload.c in the Linux kernel through 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly perform a certain size comparison before inserting a fragment header, which allows remote…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The udp6_ufo_fragment function in net/ipv6/udp_offload.c in the Linux kernel through 3.12, when UDP Fragmentation Offload (UFO) is enabled, does not properly perform a certain size comparison before inserting a fragment header, which allows remote attackers to cause a denial of service (panic) via a large IPv6 UDP packet, as demonstrated by use of the Token Bucket Filter (TBF) queueing discipline.
- CVSS 2.0
- 7.1 HIGHAV:N/AC:M/Au:N/C:N/I:N/A:C
- EPSS
- 3.90% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-189
- Affected
- linux/linux kernel · canonical/ubuntu linux
- Source
- secalert@redhat.com
EPSS 3.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288eVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2013/11/13/9Mailing List, Patch
- http://www.ubuntu.com/usn/USN-2113-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2117-1Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1030015Issue Tracking
- https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288eExploit, Patch
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=0e033e04c2678dbbe74a46b23fffb7bb918c288eVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00003.htmlMailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2013/11/13/9Mailing List, Patch
- http://www.ubuntu.com/usn/USN-2113-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2117-1Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1030015Issue Tracking
- https://github.com/torvalds/linux/commit/0e033e04c2678dbbe74a46b23fffb7bb918c288eExploit, Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.