CVE-2016-4557

Public Exploit

Description

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.

7.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 13.65% Top 10%

Vendor Advisory opensuse.org Vendor Advisory kernel.org Vendor Advisory kernel.org Vendor Advisory github.com

Affected: n/a n/a

References

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

Frequently Asked Questions

What is the severity of CVE-2016-4557?: CVE-2016-4557 has been scored as a high severity vulnerability.
How to fix CVE-2016-4557?: To fix CVE-2016-4557, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-4557 being actively exploited in the wild?: It is possible that CVE-2016-4557 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~14% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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