CVE-2015-3636

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-08-06 · updated 2026-06-17

Description

The ping_unhash function in net/ipv4/ping.c in the Linux kernel before 4.0.3 does not initialize a certain list data structure during an unhash operation, which allows local users to gain privileges or cause a denial of service (use-after-free and system crash) by leveraging the ability to make a SOCK_DGRAM socket system call for the IPPROTO_ICMP or IPPROTO_ICMPV6 protocol, and then making a connect system call after a disconnect.

Affected products

Canonical Ubuntu Linux: 12.04
Debian Linux: 7.0
Linux kernel: through 4.0.2
Red Hat Enterprise Linux: 6.0

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a134f083e79fb4c3d0a925691e732c56911b4326
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157788.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157897.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158804.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00008.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00011.html
http://rhn.redhat.com/errata/RHSA-2015-1221.html

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