Use After Free in Linux Kernel
CVE-2017-16939
The XFRM dump policy implementation in net/xfrm/xfrm_user.c in the Linux kernel before 4.13.11 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted SO_RCVBUF setsockopt system call in conjunction with XFRM_MSG_GETPOLICY Netlink messages.
Vulnerability class: Use-After-Free
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: 0.021 (81.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- Linux Kernel
- Debian Linux — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.debian.org/security/2018/dsa-4082 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2017/12/msg00004.html (mailing-list, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html (vendor-advisory, Mailing List, Third Party Advisory)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- github.com/torvalds/linux/commit/1137b5e2529a8f5ca8ee709288ecba3e68044df2 (Patch, Third Party Advisory)
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.11 (Patch, Vendor Advisory)
- seclists.org/fulldisclosure/2017/Nov/40 (Mailing List, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1355 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:1318 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/101954 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2017-16939?
- CVE-2017-16939 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2017-11-24.
- How severe is CVE-2017-16939?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2017-16939 known to be exploited?
- 30 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.