netfilter: nf_conncount: fix leaked ct in error paths
Priority LOW 33CWE-401Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-401.
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: fix leaked ct in error paths There are some situations where ct might be leaked as error paths are skipping the refcounted check and return immediately. In order to solve it make sure that the check is always called.
Why it matters now
EPSS 0.00286 21st percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.18, 6.12.64, 6.18.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.17.13 to before 6.18 | 6.18 | Patch available | CNA |
| Linux | Linux | 6.12.63 to before 6.12.64; 6.18.2 to before 6.18.3 | 6.12.64, 6.18.3 | Patch available | CNA |
- Linux VendorLinux Affected 6.17.13 to before 6.18 Fixed in 6.18 Patch available CNA
- Linux VendorLinux Affected 6.12.63 to before 6.12.64; 6.18.2 to before 6.18.3 Fixed in 6.12.64, 6.18.3 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.17.13 to before 6.18 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.12.63:*:*:*:*:*:*:* | 6.12.63 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18.2:*:*:*:*:*:*:* | 6.18.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* | 6.19 rc1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.17.13 to before 6.18 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.12.63:*:*:*:*:*:*:* Versions 6.12.63 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18.2:*:*:*:*:*:*:* Versions 6.18.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.18
- Fix · CNA Linux (Linux) Fixed in 6.12.64, 6.18.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2025-71146
- 2026-10-03 Alias added: GHSA-7v36-pgg4-9j5v
References
Patch 7
- https://git.kernel.org/stable/c/08fa37f4c8c59c294e9c18fea2d083ee94074e5a
- https://git.kernel.org/stable/c/e1ac8dce3a893641bef224ad057932f142b8a36f
- https://git.kernel.org/stable/c/f381a33f34dda9e4023e38ba68c943bca83245e9
- https://git.kernel.org/stable/c/325eb61bb30790ea27782203a17b007ce1754a67
- https://git.kernel.org/stable/c/0b88be7211d21a0d68bb1e56dc805944e3654d6f
- https://git.kernel.org/stable/c/4bd2b89f4028f250dd1c1625eb3da1979b04a5e8
- https://git.kernel.org/stable/c/2e2a720766886190a6d35c116794693aabd332b6
More Linux Kernel vulnerabilities
- 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
Sources
- CVE-2025-71146 · CVE Program
- CVE-2025-71146 · NVD
- FIRST EPSS
- GHSA-7v36-pgg4-9j5v · GitHub Advisory Database · CC BY 4.0
- CVE-2025-71146 · Red Hat security data · CC BY 4.0
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