Use After Free in Linux Kernel
CVE-2020-36387
An issue was discovered in the Linux kernel before 5.8.2. fs/io_uring.c has a use-after-free related to io_async_task_func and ctx reference holding, aka CID-6d816e088c35.
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: 0.004 (30.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.2 (Patch, Mailing List, Release Notes, Vendor Advisory)
- syzkaller.appspot.com/bug (Patch, Third Party Advisory)
- sites.google.com/view/syzscope/kasan-use-after-free-read-in-io_async_task_func (Patch, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- security.netapp.com/advisory/ntap-20210727-0006/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-36387?
- CVE-2020-36387 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.8/10. Published 2021-06-07.
- How severe is CVE-2020-36387?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-36387 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.