CVE-2017-7979

HIGH

Description

The cookie feature in the packet action API implementation in net/sched/act_api.c in the Linux kernel 4.11.x through 4.11-rc7 mishandles the tb nlattr array, which allows local users to cause a denial of service (uninitialized memory access and refcount underflow, and system hang or crash) or possibly have unspecified other impact via "tc filter add" commands in certain contexts. NOTE: this does not affect stable kernels, such as 4.10.x, from kernel.org.

References

http://marc.info/?l=linux-netdev&m=149200742616349

http://marc.info/?l=linux-netdev&m=149200746116365

http://marc.info/?l=linux-netdev&m=149200746116366

http://marc.info/?l=linux-netdev&m=149251041420194

http://marc.info/?l=linux-netdev&m=149251041420195

http://www.securityfocus.com/bid/97969

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1682368

https://bugzilla.proxmox.com/show_bug.cgi?id=1351

Details

Source: MITRE

Published: 2017-04-19

Updated: 2017-04-26

Type: CWE-20

Risk Information

CVSS v2.0

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH