CVE-2016-4557 EXPLOIT
7.8
HIGH · CVSS 3.1 · EPSS 10.2% (pctl 96)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 10.2% — more likely to be exploited than 96% of all CVEs |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2016-05-23 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| linux | linux kernel |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Linux Kernel 4.4 (Ubuntu 16.04) - 'BPF' Local Privilege Escalation (Metasploit) | 2016-11-14 |
| exploit-db | Linux Kernel 4.4.x (Ubuntu 16.04) - 'double-fdput()' bpf(BPF_PROG_LOAD) Privilege Escalation | 2016-05-04 |
References
- 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
- 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://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
- 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
- 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://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
- https://www.exploit-db.com/exploits/40759/
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