Use-after-free vulnerability in ping_unhash function in Linux kernel before 4.0.3

CVE-2015-3636 · MEDIUM Severity

AV:L/AC:L/AU:N/C:N/I:N/A:C

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.

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