Use After Free in Linux Kernel
CVE-2018-20856
An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7 (Mailing List, Release Notes, Vendor Advisory)
- github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24 (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- usn.ubuntu.com/4094-1/ (vendor-advisory)
- seclists.org/bugtraq/2019/Aug/18 (mailing-list)
- www.debian.org/security/2019/dsa-4497 (vendor-advisory)
- seclists.org/bugtraq/2019/Aug/26 (mailing-list)
- lists.debian.org/debian-lts-announce/2019/08/msg00017.html (mailing-list)
- packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2…
- usn.ubuntu.com/4116-1/ (vendor-advisory)
Frequently asked questions
- What is CVE-2018-20856?
- CVE-2018-20856 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2019-07-26.
- How severe is CVE-2018-20856?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2018-20856 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.