CVE-2019-20908: canonical ubuntu_linux
Vulnerability summary
CVE-2019-20908 is a medium (CVSS 6.9) vulnerability in canonical ubuntu_linux. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 45.2% of scored vulnerabilities.
Not severe (CVSS 6.7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 17 · Related 13Timeline
- 15-07-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · DebianEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- NVDNIST6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.54%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 0.51% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu37 products
- linux< 4.15.0-112.113
- linux-aws< 4.15.0-1079.83
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3< 5.3.0-1032.34~18.04.2
- linux-aws-fips< 4.15.0-2024.24 | All versions (No fix recorded)
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04
Debian1 product
- linux< 5.2.6-1
Linux1 product
- linux_kernel< 5.4
Opensuse1 product
- leapEOL15.1
5 vendors · 41 products
References
21 links- git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.shX Refsource MISCREPORTPatchThird Party Advisory
- mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.htmlX Refsource MISCREPORTMailing ListThird Party Advisory
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4X Refsource MISCREPORTRelease NotesVendor Advisory
Show all 21 references
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
