CVE-2017-7979

Severity: high (CVSS 7.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-04-19 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Linux kernel: 4.11-rc1, 4.11-rc2, 4.11-rc3, 4.11-rc4, 4.11-rc5, 4.11-rc6 (+1)

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
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

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