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TI-2025-26912 Aliases CVE-2025-40242GHSA-4g8j-hwjq-h8fr

gfs2: Fix unlikely race in gdlm_put_lock

Priority LOW 32Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 fixed, 3 without a fix

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

Summary

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix unlikely race in gdlm_put_lock In gdlm_put_lock(), there is a small window of time in which the DFL_UNMOUNT flag has been set but the lockspace hasn't been released, yet. In that window, dlm may still call gdlm_ast() and gdlm_bast(). To prevent it from dereferencing freed glock objects, only free the glock if the lockspace has actually been released.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00156 4th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.5, 4.10, 4.15 +10Red Hat: 2 advisoriesRed Hat: 4 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
LinuxLinux4.4.284 to before 4.5; 4.9.283 to before 4.10; 4.14.247 to before 4.15; 4.19.207 to before 4.20; 5.4.148 to before 5.5; 5.10.67 to before 5.11; 5.13.19 to before 5.14; 5.14.6 to before 5.154.5, 4.10, 4.15, 4.20, 5.5, 5.11, 5.14, 5.15Patch availableCNA
LinuxLinux5.15 and later6.1.168, 6.6.131, 6.12.56, 6.17.6, 6.18Patch availableCNA
  • Linux VendorLinux Affected 4.4.284 to before 4.5; 4.9.283 to before 4.10; 4.14.247 to before 4.15; 4.19.207 to before 4.20; 5.4.148 to before 5.5; 5.10.67 to before 5.11; 5.13.19 to before 5.14; 5.14.6 to before 5.15 Fixed in 4.5, 4.10, 4.15, 4.20, 5.5, 5.11, 5.14, 5.15 Patch available CNA
  • Linux VendorLinux Affected 5.15 and later Fixed in 6.1.168, 6.6.131, 6.12.56, 6.17.6, 6.18 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 4.5, 4.10, 4.15, 4.20, 5.5, 5.11, 5.14, 5.15
  • Fix · CNA Linux (Linux) Fixed in 6.1.168, 6.6.131, 6.12.56, 6.17.6, 6.18

Red Hat 2 advisories

  • RHSA-2026:75747 Released 2026-10-05 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.171.1.el8_10, kernel-4.18.0-553.171.1.el8_10, kernel-abi-stablelists-4.18.0-553.171.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.171.1.el8_10
  • RHSA-2026:75746 Released 2026-10-05 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.171.1.rt7.512.el8_10, kernel-rt-core-4.18.0-553.171.1.rt7.512.el8_10, kernel-rt-debug-4.18.0-553.171.1.rt7.512.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.171.1.rt7.512.el8_10, kernel-rt-core-4.18.0-553.171.1.rt7.512.el8_10, kernel-rt-debug-4.18.0-553.171.1.rt7.512.el8_10 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:75747
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:75747
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:75746
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:75746
Not affected: 1 product
  • Red Hat Enterprise Linux 10

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40242
  2. 2026-10-03 Alias added: GHSA-4g8j-hwjq-h8fr
  3. 2026-10-05 Fix available: RHSA-2026:75746 · Red Hat
  4. 2026-10-05 Fix available: RHSA-2026:75747 · Red Hat
  5. 2026-10-05 Fix available: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8), Red Hat Enterprise Linux NFV (v. 8) +1 · Red Hat
  6. 2026-10-16 CISA SSVC decision points changed

References

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-2021-02452 Incorrect authorization in Ubuntu linux kernel 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
See all 21741 →

Sources

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