Read the docs
TI-2025-00571 Aliases CVE-2025-0677GHSA-h592-gmp8-rvr7

Grub2: ufs: integer overflow may lead to heap based out-of-bounds write when handling symlinks

Priority LOW 30CWE-787Published · 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
Partial Red Hat: 2 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

A flaw was found in grub2. When performing a symlink lookup, the grub's UFS module checks the inode's data size to allocate the internal buffer to read the file content, however, it fails to check if the symlink data size has overflown. When this occurs, grub_malloc() may be called with a smaller value than needed. When further reading the data from the disk into the buffer, the grub_ufs_lookup_symlink() function will write past the end of the allocated size. An attack can leverage this by crafting a malicious filesystem, and as a result, it will corrupt data stored in the heap, allowing for arbitrary code execution used to by-pass secure boot mechanisms.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00328 26th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—grub2up to 2.12—No fix listedCNA
Red HatRed Hat Enterprise Linux 10—1:2.12-15.el10_0Patch availableCNA
Red HatRed Hat Enterprise Linux 9—1:2.06-104.el9_6Patch availableCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
Red HatRed Hat Enterprise Linux 8——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 4——No fix listedCNA
  • grub2 Vendor— Affected up to 2.12 Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 1:2.12-15.el10_0 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1:2.06-104.el9_6 Patch available CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 5

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.010.0—Red Hat
cpe:/o:redhat:enterprise_linux:9::baseos9—Red Hat
cpe:/o:redhat:rhel_els:77—Red Hat
cpe:/a:redhat:enterprise_linux:88—Red Hat
cpe:/a:redhat:openshift:44—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.0 Versions 10.0 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:9::baseos Versions 9 — ·Red Hat
  • cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
  • cpe:/a:redhat:openshift:4 Versions 4 — ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2025:16154 Released 2025-09-18 · Red Hat rating Moderate
    grub2 security update
    • Red Hat Enterprise Linux BaseOS (v. 10) grub2-1:2.12-15.el10_0, grub2-common-1:2.12-15.el10_0, grub2-efi-aa64-1:2.12-15.el10_0 +13
  • RHSA-2025:6990 Released 2025-05-13 · Red Hat rating Moderate
    grub2 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) grub2-1:2.06-104.el9_6, grub2-common-1:2.06-104.el9_6, grub2-efi-aa64-1:2.06-104.el9_6 +13

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 and 3 more products — RHSA-2025:6990

    8 records Highest priority Priority LOW 8 LOW

    Other records, highest priority first

    • TI-2025-00584 Grub2: read: integer overflow may lead to out-of-bounds writePriority LOW 31
    • TI-2024-30748 Grub2: fs/ufs: oob write in the heapPriority LOW 31
    • TI-2024-30743 Grub2: grub-core/gettext: integer overflow leads to heap oob write and read.Priority LOW 31
    Show all 8 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 and 3 more products — RHSA-2025:16154

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2024-30748 Grub2: fs/ufs: oob write in the heapPriority LOW 31
    • TI-2024-30743 Grub2: grub-core/gettext: integer overflow leads to heap oob write and read.Priority LOW 31
    • TI-2025-00523 Grub2: command/gpg: use-after-free due to hooks not being removed on module unloadPriority LOW 30
    Show all 5 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix planned: Out of support scope
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:16154
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:6990

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-0677
  2. 2026-10-03 Alias added: GHSA-h592-gmp8-rvr7
  3. 2026-10-21 Affected versions changed · CNA
  4. 2026-10-21 Affected versions changed · Red Hat
  5. 2026-10-21 Affected versions changed · CNA
  6. 2026-10-22 Affected versions changed · Red Hat

References

Advisory 2

Other 3

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

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