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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…
- 6.7MediumCVSS base score
- 0.54%Exploitation in 30 daysEPSS · top 54% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.54% · top 54% of all CVEs (11 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.
Affected products
n/a
- affected n/a
References
References13
- https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh (opens in a new tab)x_refsource_MISCx_transferred
- https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html (opens in a new tab)x_refsource_MISCx_transferred
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e (opens in a new tab)x_refsource_MISCx_transferred
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4 (opens in a new tab)x_refsource_MISCx_transferred
- [oss-security] 20200720 Re: Re: lockdown bypass on ubuntu 18.04's 4.15 kernel for loading unsigned modules (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-4427-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20200730 Re: UEFI SecureBoot bypass fixes rolled out to kernels below radar (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20200730 UEFI SecureBoot bypass fixes rolled out to kernels below radar (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-4439-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-4426-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-4440-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- openSUSE-SU-2020:1153 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-11442 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-20908)Record last updated .