Description
The ip6_append_data_mtu function in net/ipv6/ip6_output.c in the IPv6 implementation in the Linux kernel through 3.10.3 does not properly maintain information about whether the IPV6_MTU setsockopt option had been specified, which allows local users to cause a denial of service (BUG and system crash) via a crafted application that uses the UDP_CORK option in a setsockopt system call.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 3.10.5-1 | — |
| Debian 13 | linux | 3.10.5-1 | — |
| Debian 12 | linux | 3.10.5-1 | — |
| Debian 7 | linux | 3.2.46-1+deb7u1 | DSA-2745-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 2 | kernel-rt +11 | 3.6.11.5-rt37.55.el6rt | RHSA-2013:1264 |
Advisories 2
- DSA-2745-1 linux - several Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2013:1264 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
References
- USN-1943-1 vendor-advisory
- [oss-security] 20130723 Re: CVE request: Linux kernel: panic while appending data to a corked IPv6 socket in ip6_append_data_mtu mailing-list
- SUSE-SU-2013:1473 vendor-advisory
- USN-1938-1 vendor-advisory
- 61412 vdb-entry
- USN-1944-1 vendor-advisory
- USN-1945-1 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=75a493e60ac4bbe2e977e7129d6d8cbb0dd236be
- SUSE-SU-2013:1474 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=987633
- USN-1947-1 vendor-advisory
- 54148 third-party-advisory
- USN-1941-1 vendor-advisory
- USN-1942-1 vendor-advisory
- https://github.com/torvalds/linux/commit/75a493e60ac4bbe2e977e7129d6d8cbb0dd236be
- USN-1946-1 vendor-advisory