CVE-2016-4557

moderate-risk

Published 2016-05-23

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.

Do I need to act?

18.6% chance of exploitation in next 30 days

EPSS score — higher than 81% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

2 public exploits available

40759, 39772

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.8/10 High

LOCAL / LOW complexity

Affected Products (1)

Linux Kernel

Affected Vendors

Linux

References (18)

Vendor Advisory http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b0...

Mailing List http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html

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

Mailing List http://www.openwall.com/lists/oss-security/2016/05/06/4

Third Party Advisory https://bugs.chromium.org/p/project-zero/issues/detail?id=808

Third Party Advisory https://bugs.debian.org/823603

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1334307

Vendor Advisory https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c...

Third Party Advisory https://www.exploit-db.com/exploits/40759/