CVE-2015-3636

Published: 2 May 2015

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.

From the Ubuntu Security Team

Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping support. A local user could exploit this flaw to cause a denial of service (system crash) or gain administrative privileges on the system.

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3636
• https://lkml.org/lkml/2011/5/13/382
• http://www.openwall.com/lists/oss-security/2015/05/02
• https://ubuntu.com/security/notices/USN-2631-1
• https://ubuntu.com/security/notices/USN-2632-1
• https://ubuntu.com/security/notices/USN-2633-1
• https://ubuntu.com/security/notices/USN-2634-1
• https://ubuntu.com/security/notices/USN-2635-1
• https://ubuntu.com/security/notices/USN-2636-1
• https://ubuntu.com/security/notices/USN-2637-1
• https://ubuntu.com/security/notices/USN-2638-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1453256