CVE-2016-4557

Severity

72%

Complexity

39%

Confidentiality

165%

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.

CWE-416: Use After Free

CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Overview

First reported 9 years ago

2016-05-23 10:59:00

Last updated 7 years ago

2017-09-03 01:29:00

Affected Software

Linux Kernel

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7

openSUSE-SU-2016:1641

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5

[oss-security] 20160506 CVE Requests: Linux: BPF flaws (one use-after-free / local root privilege escalation)

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

Vendor Advisory

40759

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