Vulnerability in Linux Kernel
CVE-2016-4557
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.102 (95.5th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.102 · newest: 0.102 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- bugs.debian.org/823603 (Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.html (vendor-advisory, Mailing List, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 (Vendor Advisory)
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5 (Vendor Advisory)
- bugs.chromium.org/p/project-zero/issues/detail (Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Vendor Advisory)
- www.openwall.com/lists/oss-security/2016/05/06/4 (mailing-list, Mailing List, Third Party Advisory)
- www.exploit-db.com/exploits/40759/ (VDB Entry, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2016-4557?
- CVE-2016-4557 is a high-severity vulnerability in Linux Kernel. CVSS score: 7.8/10. Published 2016-05-23.
- How severe is CVE-2016-4557?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2016-4557 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.