Vulnerability in Linux Kernel
CVE-2019-20908
An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Linux Kernel
- Canonical Ubuntu Linux — versions 16.04, 18.04
- openSUSE Leap — versions 15.1
Public proof-of-concept exploits
References
- git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh (Patch, Third Party Advisory)
- mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html (Mailing List, Third Party Advisory)
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4 (Release Notes, Vendor Advisory)
- www.openwall.com/lists/oss-security/2020/07/20/6 (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4427-1/ (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/07/29/3 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/07/30/3 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/07/30/2 (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4439-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-20908?
- CVE-2019-20908 is a medium-severity vulnerability in Linux Kernel. CVSS score: 6.7/10. Published 2020-07-15.
- How severe is CVE-2019-20908?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2019-20908 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.