Integer overflow in Grub
Priority LOW 29CWE-190Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, Red Hat and Microsoft. Impact type from CWE-190 and the CVSS impact.
Summary
In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and availability impacts during the boot process.
Why it matters now
EPSS 0.00432 37th percentileScored 2026-11-07
Fix Fixed Red Hat: 9 advisoriesMicrosoft: 1 update
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Grub | All grub2 versions before 2.06 | — | No fix listed | CNA |
- Grub Vendor— Affected All grub2 versions before 2.06 Fixed in — No fix listed CNA
Remediation
Red Hat 9 advisories
- RHSA-2020:3274 Released 2020-08-03 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) fwupdate-12-6.el7_7, fwupdate-efi-12-6.el7_7, fwupdate-libs-12-6.el7_7 +18
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) fwupdate-devel-12-6.el7_7, grub2-efi-aa64-modules-1:2.02-0.86.el7_7, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_7 +4
- Red Hat Enterprise Linux Server EUS (v. 7.7) fwupdate-12-6.el7_7, fwupdate-efi-12-6.el7_7, fwupdate-libs-12-6.el7_7 +22
- Red Hat Enterprise Linux Server Optional EUS (v. 7.7) fwupdate-devel-12-6.el7_7, grub2-efi-aa64-modules-1:2.02-0.86.el7_7, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_7 +7
- RHSA-2020:3276 Released 2020-08-03 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux Server AUS (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-ia32-1:2.02-0.86.el7 +17
- Red Hat Enterprise Linux Server E4S (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-aa64-modules-1:2.02-0.86.el7 +21
- Red Hat Enterprise Linux Server Optional AUS (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-aa64-modules-1:2.02-0.86.el7 +17
- Red Hat Enterprise Linux Server Optional E4S (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-aa64-modules-1:2.02-0.86.el7 +18
- Red Hat Enterprise Linux Server Optional TUS (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-aa64-modules-1:2.02-0.86.el7 +17
- Red Hat Enterprise Linux Server TUS (v. 7.3) grub2-1:2.02-0.86.el7, grub2-common-1:2.02-0.86.el7, grub2-efi-aa64-modules-1:2.02-0.86.el7 +20
- RHSA-2020:3271 Released 2020-08-03 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) fwupdate-12-6.el7_6, fwupdate-efi-12-6.el7_6, fwupdate-libs-12-6.el7_6 +18
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) fwupdate-devel-12-6.el7_6, grub2-efi-aa64-modules-1:2.02-0.86.el7_6, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_6 +4
- Red Hat Enterprise Linux Server EUS (v. 7.6) fwupdate-12-6.el7_6, fwupdate-efi-12-6.el7_6, fwupdate-libs-12-6.el7_6 +22
- Red Hat Enterprise Linux Server Optional EUS (v. 7.6) fwupdate-devel-12-6.el7_6, grub2-efi-aa64-modules-1:2.02-0.86.el7_6, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_6 +7
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) grub2-1:2.02-0.86.el7_6, grub2-common-1:2.02-0.86.el7_6, grub2-ppc64le-1:2.02-0.86.el7_6 +4
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) grub2-efi-aa64-modules-1:2.02-0.86.el7_6, grub2-efi-ia32-modules-1:2.02-0.86.el7_6, grub2-efi-x64-modules-1:2.02-0.86.el7_6 +3
Show 6 more Red Hat advisories
- RHSA-2020:3275 Released 2020-08-03 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux Server AUS (v. 7.4) fwupdate-9-10.el7_4, fwupdate-efi-9-10.el7_4, fwupdate-libs-9-10.el7_4 +18
- Red Hat Enterprise Linux Server E4S (v. 7.4) fwupdate-9-10.el7_4, fwupdate-efi-9-10.el7_4, fwupdate-libs-9-10.el7_4 +20
- Red Hat Enterprise Linux Server Optional AUS (v. 7.4) fwupdate-9-10.el7_4, fwupdate-devel-9-10.el7_4, grub2-efi-aa64-modules-1:2.02-0.86.el7_4 +5
- Red Hat Enterprise Linux Server Optional E4S (v. 7.4) fwupdate-9-10.el7_4, fwupdate-devel-9-10.el7_4, grub2-efi-aa64-modules-1:2.02-0.86.el7_4 +8
- Red Hat Enterprise Linux Server Optional TUS (v. 7.4) fwupdate-9-10.el7_4, fwupdate-devel-9-10.el7_4, grub2-efi-aa64-modules-1:2.02-0.86.el7_4 +5
- Red Hat Enterprise Linux Server TUS (v. 7.4) fwupdate-9-10.el7_4, fwupdate-efi-9-10.el7_4, fwupdate-libs-9-10.el7_4 +18
- RHSA-2020:3273 Released 2020-08-03 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux Server AUS (v. 7.2) grub2-1:2.02-0.86.el7_2, grub2-common-1:2.02-0.86.el7_2, grub2-efi-ia32-1:2.02-0.86.el7_2 +14
- Red Hat Enterprise Linux Server Optional AUS (v. 7.2) grub2-1:2.02-0.86.el7_2, grub2-efi-aa64-modules-1:2.02-0.86.el7_2, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_2 +10
- RHSA-2020:3227 Released 2020-07-29 · Red Hat rating Moderategrub2 security update
- Red Hat Enterprise Linux BaseOS E4S (v. 8.0) fwupd-1.1.4-2.el8_0, grub2-1:2.02-87.el8_0, grub2-common-1:2.02-87.el8_0 +18
- RHSA-2020:3217 Released 2020-07-29 · Red Hat rating Moderategrub2 security and bug fix update
- Red Hat Enterprise Linux Client (v. 7) fwupdate-12-6.el7_8, fwupdate-efi-12-6.el7_8, fwupdate-libs-12-6.el7_8 +18
- Red Hat Enterprise Linux Client Optional (v. 7) fwupdate-devel-12-6.el7_8, grub2-efi-aa64-modules-1:2.02-0.86.el7_8, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_8 +4
- Red Hat Enterprise Linux ComputeNode (v. 7) fwupdate-12-6.el7_8, fwupdate-efi-12-6.el7_8, fwupdate-libs-12-6.el7_8 +18
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) fwupdate-devel-12-6.el7_8, grub2-efi-aa64-modules-1:2.02-0.86.el7_8, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_8 +4
- Red Hat Enterprise Linux Server (v. 7) fwupdate-12-6.el7_8, fwupdate-efi-12-6.el7_8, fwupdate-libs-12-6.el7_8 +22
- Red Hat Enterprise Linux Server Optional (v. 7) fwupdate-devel-12-6.el7_8, grub2-efi-aa64-modules-1:2.02-0.86.el7_8, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_8 +7
- Red Hat Enterprise Linux Workstation (v. 7) fwupdate-12-6.el7_8, fwupdate-efi-12-6.el7_8, fwupdate-libs-12-6.el7_8 +18
- Red Hat Enterprise Linux Workstation Optional (v. 7) fwupdate-devel-12-6.el7_8, grub2-efi-aa64-modules-1:2.02-0.86.el7_8, grub2-efi-ia32-cdboot-1:2.02-0.86.el7_8 +4
- RHSA-2020:3223 Released 2020-07-29 · Red Hat rating Moderategrub2 security update
- Red Hat CodeReady Linux Builder EUS (v. 8.1) shim-unsigned-x64-15-7.el8
- Red Hat Enterprise Linux BaseOS EUS (v. 8.1) fwupd-1.1.4-2.el8_1, grub2-1:2.02-87.el8_1, grub2-common-1:2.02-87.el8_1 +21
- RHSA-2020:3216 Released 2020-07-29 · Red Hat rating Moderategrub2 security update
- Red Hat CodeReady Linux Builder (v. 8) shim-unsigned-x64-15-7.el8
- Red Hat Enterprise Linux BaseOS (v. 8) fwupd-1.1.4-7.el8_2, grub2-1:2.02-87.el8_2, grub2-common-1:2.02-87.el8_2 +21
Microsoft 1 update
- ADV200011 Released 2020-07-29Microsoft Guidance for Addressing Security Feature Bypass in GRUB
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Grub — openSUSE-SU-2020:1168
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2020-08612 Buffer overflow in GrubPriority LOW 39
- TI-2020-11180 Integer overflow in GrubPriority LOW 30
- Advisory ·
Grub — openSUSE-SU-2020:1169
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2020-08612 Buffer overflow in GrubPriority LOW 39
- TI-2020-11180 Integer overflow in GrubPriority LOW 30
Show 1 more group
- Advisory ·
Grub — USN-4432-1
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2020-08612 Buffer overflow in GrubPriority LOW 39
- TI-2020-11180 Integer overflow in GrubPriority LOW 30
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2020:3216 |
| Red Hat CodeReady Linux Builder EUS (v. 8.1) | Fixed | RHSA-2020:3223 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2020:3216 |
| Red Hat Enterprise Linux BaseOS E4S (v. 8.0) | Fixed | RHSA-2020:3227 |
| Red Hat Enterprise Linux BaseOS EUS (v. 8.1) | Fixed | RHSA-2020:3223 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) | Fixed | RHSA-2020:3271 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) | Fixed | RHSA-2020:3274 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) | Fixed | RHSA-2020:3271 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) | Fixed | RHSA-2020:3274 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux Server AUS (v. 7.2) | Fixed | RHSA-2020:3273 |
| Red Hat Enterprise Linux Server AUS (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server AUS (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Server E4S (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server E4S (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Server EUS (v. 7.6) | Fixed | RHSA-2020:3271 |
| Red Hat Enterprise Linux Server EUS (v. 7.7) | Fixed | RHSA-2020:3274 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux Server Optional AUS (v. 7.2) | Fixed | RHSA-2020:3273 |
| Red Hat Enterprise Linux Server Optional AUS (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server Optional AUS (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Server Optional E4S (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server Optional E4S (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Server Optional EUS (v. 7.6) | Fixed | RHSA-2020:3271 |
| Red Hat Enterprise Linux Server Optional EUS (v. 7.7) | Fixed | RHSA-2020:3274 |
| Red Hat Enterprise Linux Server Optional TUS (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server Optional TUS (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Server TUS (v. 7.3) | Fixed | RHSA-2020:3276 |
| Red Hat Enterprise Linux Server TUS (v. 7.4) | Fixed | RHSA-2020:3275 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2020:3217 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2020:3271 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) | Fixed | RHSA-2020:3271 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14308
- 2026-10-03 Alias added: GHSA-6f8f-rchr-mhp3
References
Advisory 10
- https://bugzilla.redhat.com/show_bug.cgi?id=1852009
- [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities
- https://security.netapp.com/advisory/ntap-20200731-0008/
- USN-4432-1
- openSUSE-SU-2020:1169
- openSUSE-SU-2020:1168
- GLSA-202104-05
- [oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros list
- [oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros list
- [oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros list
Sources
- CVE-2020-14308 · CVE Program
- CVE-2020-14308 · NVD
- FIRST EPSS
- GHSA-6f8f-rchr-mhp3 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-14308 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences