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TI-2020-11180 Aliases CVE-2020-14309GHSA-8whj-mpcj-4jv6

Integer overflow in Grub

Priority LOW 30CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
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

There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.

Why it matters now

EPSS 0.00482 41st 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

VendorProductAffected versionsFixed inStatusSource
—GrubAll grub2 versions before 2.06—No fix listedCNA
  • Grub Vendor— Affected All grub2 versions before 2.06 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*before 2.06VulnerableGNU
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*15.2VulnerableopenSUSE
  • cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* Versions before 2.06 Vulnerable ·GNU
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* Versions 15.2 Vulnerable ·openSUSE

Remediation

Red Hat 9 advisories

  • RHSA-2020:3274 Released 2020-08-03 · Red Hat rating Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 Moderate
    grub2 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 2020-07-29
    Microsoft 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.

Show 1 more group

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan 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

  1. 2026-10-02 Threatist record created from CVE-2020-14309
  2. 2026-10-03 Alias added: GHSA-8whj-mpcj-4jv6

References

Advisory 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences