Use After Free in F5 Traffix Signaling Delivery Controller
CVE-2018-20836
An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.051 (92.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.051 · newest: 0.051 · change: 0.000
Affected products
- F5 Traffix Signaling Delivery Controller — versions 5.0.0, 5.1.0
- Linux Kernel
- NetApp Active Iq Unified Manager
- NetApp Hci Compute Node
- NetApp Snapprotect
- NetApp Solidfire \& Hci Management Node
- NetApp Solidfire \& Hci Storage Node
- NetApp Storage Replication Adapter For Clustered Data Ontap
- NetApp Vasa Provider For Clustered Data Ontap
- NetApp Virtual Storage Console
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae (Patch, Vendor Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- www.securityfocus.com/bid/108196 (VDB Entry, Third Party Advisory, vdb-entry)
- support.f5.com/csp/article/K11225249 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20190719-0003/ (Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html (vendor-advisory, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4076-1/ (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2019/dsa-4495 (vendor-advisory, Third Party Advisory)
- seclists.org/bugtraq/2019/Aug/13 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-20836?
- CVE-2018-20836 is a high-severity vulnerability in F5 Traffix Signaling Delivery Controller, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2019-05-07.
- How severe is CVE-2018-20836?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2018-20836 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.