CVE-2016-4557

43Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendepss 10%

from disclosure to weapon0 days

Published on NVDMay 23

1st PoCMay 4

metasploitMay 4

exploitation probability

10%top 5% of all CVEs

observed exploitation

nono source reports it

3 public exploit(s)

The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the Linux kernel before 4.5.5 does not properly maintain an fd data structure, which allows local users to gain privileges or cause a denial of service (use-after-free) via crafted BPF instructions that reference an incorrect file descriptor.

Affected products

n/a · n/a

public PoCs found — 3

cve_referencewww.exploit-db.com/exploits/40759/unverified exploitdbwww.exploit-db.com/exploits/40759unverified exploitdbwww.exploit-db.com/exploits/39772unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html https://bugs.chromium.org/p/project-zero/issues/detail?id=808 https://bugs.debian.org/823603 https://bugzilla.redhat.com/show_bug.cgi?id=1334307 https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 https://www.exploit-db.com/exploits/40759/http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5 http://www.openwall.com/lists/oss-security/2016/05/06/4