CVE-2020-14311
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow
02 Description
There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.46% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 40.0% of scored records. A rank, not a probability.
- NVD base score
- 6.0 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-07-31 20:56Z6 YR AGO
- Last updated
- 2024-08-04 12:39Z2 YR AGO
- Reserved
- 2020-06-17
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.7)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
- Weaknesses
- Data version
- 5.1
- Document digest
- fcab75c8aa62d61b115ccdf904b26c89eae10f0bdb2995a86b7d5db8ab15a2e0
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
- usn.ubuntu.comUSN-4432-1https://usn.ubuntu.com/4432-1/
- lists.opensuse.orgopenSUSE-SU-2020:1169http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
- lists.opensuse.orgopenSUSE-SU-2020:1168http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
- security.gentoo.orgGLSA-202104-05https://security.gentoo.org/glsa/202104-05
- www.openwall.com[oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/17/2
- www.openwall.com[oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/17/4
- www.openwall.com[oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/21/1
07 Fixed in
Debian 12
- grub2 Fixed in 2.04-9
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- grub2 Fixed in 2.04-9
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- grub2 Fixed in 2.04-9
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- grub2 Fixed in 2.02~beta2-36ubuntu3.26
- grub2-signed Fixed in 1.66.26
- grub2-unsigned No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- grub2 Fixed in 2.02-2ubuntu8.16
- grub2-signed Fixed in 1.93.18
- grub2-unsigned Fixed in 2.04-1ubuntu47.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- grub2 Fixed in 2.04-1ubuntu26.1
- grub2-signed Fixed in 1.142.3
- grub2-unsigned Fixed in 2.04-1ubuntu47.4
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- grub2 Fixed in 2.02~beta2-9ubuntu1.20Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- grub2-signed Fixed in 1.34.22Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.