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TI-2012-01873 Aliases CVE-2012-2100GHSA-cx5x-f2xm-m2cr

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on…

Priority LOW 36CWE-189Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Complete
Fix status
Partial Red Hat: 10 fixed, 2 without a fix

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-189 and the CVSS impact.

Summary

The ext4_fill_flex_info function in fs/ext4/super.c in the Linux kernel before 3.2.2, on the x86 platform and unspecified other platforms, allows user-assisted remote attackers to trigger inconsistent filesystem-groups data and possibly cause a denial of service via a malformed ext4 filesystem containing a super block with a large FLEX_BG group size (aka s_log_groups_per_flex value). NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-4307.

Why it matters now

EPSS 0.02671 85th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 10 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:x86:*up to 3.2.1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:3.2:*:*:*:*:*:x86:*3.2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:x86:* Versions up to 3.2.1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:3.2:*:*:*:*:*:x86:* Versions 3.2 Vulnerable ·Linux

Remediation

Red Hat 2 advisories

  • RHSA-2012:1580 Released 2012-12-18 · Red Hat rating Moderate
    kernel security, bug fix and enhancement update
    • Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-279.19.1.el6, kernel-debug-2.6.32-279.19.1.el6, kernel-debug-devel-2.6.32-279.19.1.el6 +5
    • Red Hat Enterprise Linux Desktop Optional (v. 6) kernel-2.6.32-279.19.1.el6, python-perf-2.6.32-279.19.1.el6
    • Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-279.19.1.el6, kernel-debug-2.6.32-279.19.1.el6, kernel-debug-devel-2.6.32-279.19.1.el6 +5
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) kernel-2.6.32-279.19.1.el6, python-perf-2.6.32-279.19.1.el6
    • Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-279.19.1.el6, kernel-bootwrapper-2.6.32-279.19.1.el6, kernel-debug-2.6.32-279.19.1.el6 +8
    • Red Hat Enterprise Linux Server Optional (v. 6) kernel-2.6.32-279.19.1.el6, python-perf-2.6.32-279.19.1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-279.19.1.el6, kernel-debug-2.6.32-279.19.1.el6, kernel-debug-devel-2.6.32-279.19.1.el6 +5
    • Red Hat Enterprise Linux Workstation Optional (v. 6) kernel-2.6.32-279.19.1.el6, python-perf-2.6.32-279.19.1.el6
  • RHSA-2012:1445 Released 2012-11-13 · Red Hat rating Low
    kernel security and bug fix update
    • Red Hat Enterprise Linux (v. 5 server) kernel-2.6.18-308.20.1.el5, kernel-2.6.18-308.20.1.el5.ia64, kernel-PAE-2.6.18-308.20.1.el5 +18
    • Red Hat Enterprise Linux Desktop (v. 5 client) kernel-2.6.18-308.20.1.el5, kernel-PAE-2.6.18-308.20.1.el5, kernel-PAE-devel-2.6.18-308.20.1.el5 +8

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 4AffectedNo fix planned: Will not fix
Red Hat Enterprise MRG 2AffectedNo fix yet
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2012:1445
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2012:1445
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2012:1580
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2012:1580

Timeline

  1. 2026-10-02 Threatist record created from CVE-2012-2100
  2. 2026-10-03 Alias added: GHSA-cx5x-f2xm-m2cr

References

Advisory 2

Other 5

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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