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TI-2020-11182 Aliases CVE-2020-14311GHSA-2jpf-4r7j-42qr

Heap-based buffer overflow in grub2

Priority LOW 27CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, Red Hat and Microsoft.

Summary

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 leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

Why it matters now

EPSS 0.00465 40th 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
The Grub2 Projectgrub22.06—No fix listedCNA
  • grub2 VendorThe Grub2 Project Affected 2.06 Fixed in — No fix listed CNA

CPE configurations NVD · 13

CPEVersionsRoleVendor
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*before 2.06VulnerableGNU
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*8.1VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*8.2VulnerableRed Hat
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*15.2VulnerableopenSUSE
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
  • cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* Versions before 2.06 Vulnerable ·GNU
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* Versions 8.1 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* Versions 8.2 Vulnerable ·Red Hat
  • 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
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
Show 3 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical

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.

  • Advisory ·

    The Grub2 Project grub2 — openSUSE-SU-2020:1168

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →
  • Advisory ·

    The Grub2 Project grub2 — openSUSE-SU-2020:1169

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →
Show 1 more group
  • Advisory ·

    The Grub2 Project grub2 — USN-4432-1

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    Show all 2 records → Advisory →

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-2020-14311
  2. 2026-10-03 Alias added: GHSA-2jpf-4r7j-42qr

References

Advisory 8

Sources

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