netfilter: nf_tables: unconditionally bump set->nelems before insertion
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally bump set->nelems before insertion In case that the set is full, a new element gets published then removed without waiting for the RCU grace period, while RCU reader can be walking over it already. To address this issue, add the element transaction even if set is full, but toggle the set_full flag to report -ENFILE so the abort path safely unwinds the set to its previous state. As for element updates, decrement set->nelems to restore it. A simpler fix is to call synchronize_rcu() in the error path. However, with a large batch adding elements to already maxed-out set, this could cause noticeable slowdown of such batches.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.9.33 to before 4.10 | 4.10 | Patch available | CNA |
| Linux | Linux | 4.10 and later | 5.10.273, 5.15.224, 6.1.177, 6.6.141, 6.12.91, 6.18.17, 6.19.7, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 4.9.33 to before 4.10 Fixed in 4.10 Patch available CNA
- Linux VendorLinux Affected 4.10 and later Fixed in 5.10.273, 5.15.224, 6.1.177, 6.6.141, 6.12.91, 6.18.17, 6.19.7, 7.0 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.9.33 to before 4.10; 4.10.1 to before 6.18.17; 6.19 to before 6.19.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.10:-:*:*:*:*:*:* | 4.10 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.10:rc6:*:*:*:*:*:* | 4.10 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.10:rc7:*:*:*:*:*:* | 4.10 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.10:rc8:*:*:*:*:*:* | 4.10 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | 7.0 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | 7.0 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.9.33 to before 4.10; 4.10.1 to before 6.18.17; 6.19 to before 6.19.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.10:-:*:*:*:*:*:* Versions 4.10 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.10:rc6:*:*:*:*:*:* Versions 4.10 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.10:rc7:*:*:*:*:*:* Versions 4.10 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.10:rc8:*:*:*:*:*:* Versions 4.10 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.10
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.177, 6.6.141, 6.12.91, 6.18.17, 6.19.7, 7.0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-23272
- 2026-10-03 Alias added: GHSA-qhvv-4mw5-pxh3
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-19 Weakness changed · CISA ADP
- 2026-10-30 Fix available: Linux/Linux@022effa9c54903858e443b1225370e6c758d03f6, Linux/Linux@25841e8d4241c6c3763e70ae95050f8108707b46, Linux/[email protected] +1 · CNA
- 2026-10-30 2 new references · CNA
References
Patch 3
Other 5
- https://git.kernel.org/stable/c/25841e8d4241c6c3763e70ae95050f8108707b46
- https://git.kernel.org/stable/c/022effa9c54903858e443b1225370e6c758d03f6
- https://git.kernel.org/stable/c/25fcaef7948912652905e96922f36583a84fffed
- https://git.kernel.org/stable/c/e3ccb11fc8249759d23326038c8db987ddaabc77
- https://git.kernel.org/stable/c/86bc4b1a0f672d47ac19f9022432cb6a2e01cb33
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-2026-23272 · CVE Program
- CVE-2026-23272 · NVD
- FIRST EPSS
- GHSA-qhvv-4mw5-pxh3 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-23272 · Red Hat security data · CC BY 4.0
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