Use After Free in Linux Kernel
CVE-2020-8428
fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.6% 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
- www.openwall.com/lists/oss-security/2020/01/28/2 (Mailing List, Third Party Advisory)
- github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6 (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- www.openwall.com/lists/oss-security/2020/01/28/4 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/02/02/1 (mailing-list)
- security.netapp.com/advisory/ntap-20200313-0003/
- lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html (vendor-advisory)
- usn.ubuntu.com/4320-1/ (vendor-advisory)
- usn.ubuntu.com/4318-1/ (vendor-advisory)
- packetstormsecurity.com/files/157233/Kernel-Live-Patch-Security-Notice-LSN-0065…
Frequently asked questions
- What is CVE-2020-8428?
- CVE-2020-8428 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.1/10. Published 2020-01-29.
- How severe is CVE-2020-8428?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2020-8428 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.