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CVE-2016-4557

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Date: May 23, 2016

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.

Language: C

Severity Score

Related Resources (12)

https://bugs.chromium.org/p/project-zero/issues/detail?id=808
https://www.exploit-db.com/exploits/40759/
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.debian.org/823603
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5
http://www.openwall.com/lists/oss-security/2016/05/06/4
https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7
https://nvd.nist.gov/vuln/detail/CVE-2016-4557
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-4557
https://bugzilla.redhat.com/show_bug.cgi?id=1334307
https://www.mend.io/vulnerability-database/CVE-2016-4557

Severity Score

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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