CVE-2013-4563

high

Published 2013-11-20 · Modified 2026-04-29

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

7.1

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Linux kernel Affected 1 release

Version	Status	Fixed in
—	Affected	`3.12.4`

Ubuntu Affected 2 releases

Version	Status	Fixed in
13.10	Affected	—
12.04	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`3.11.10-1`
sid	Fixed	`3.11.10-1`
forky	Fixed	`3.11.10-1`
bullseye	Fixed	`3.11.10-1`
bookworm	Fixed	`3.11.10-1`

References

CWEs

CWE-189

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.