CVE-2016-4557

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.

CVSS v3.1 NVD

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS

10.20% chance of exploitation in the next 30 days, 96th percentile

Published

2016-05-23

Updated

2024-08-06

Proof-of-concept exploits (1)

• s0nk3y/php-kernel-exploit3★ · 2016-07-20

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/bpf_priv_esc.rb

ExploitDB entries (2)

• https://www.exploit-db.com/exploits/40759
• https://www.exploit-db.com/exploits/39772

Security advisories

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5…
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5
• torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html
• http://www.openwall.com/lists/oss-security/2016/05/06/4
• 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

References

• CVE Record
• NVD entry