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High 2 vendors · 2 advisories

CVE-2026-23231: netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

CVE-2026-23231 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
High
CVSS base score
7.8 (NetApp), 7.5 (Red Hat)
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H · base score 7.8, scored by LinuxAttack vector: local. Attack complexity: low. Privileges required: low. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: high. Availability impact: high.
Weakness
  • CWE-416 Use After Free
EPSS
1.04% chance of exploitation in the next 30 days (64th percentile). FIRST EPSS, .
CISA SSVC
Exploitation: none observed. Automatable: no. Technical impact: total. CISA, .
Fixed releases
  • NetApp: ONTAP tools for VMware vSphere 10: 10.6
  • Red Hat: RHSA-2026:10756
Vendor advisories
2 from NetApp, Red Hat
Assigned by
Linux (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-23231; each belongs to its advisory, not to every product listed. How records are collected and checked.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be walking the chain when the error path frees it. 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly installs the IPv4 hook before IPv6 registration fails. Packets entering nft_do_chain() via the transient IPv4 hook can still be dereferencing chain->blob_gen_X when the error path frees the chain. Add synchronize_rcu() between nft_chain_del() and the chain destroy so that all RCU readers -- both dump threads and in-flight packet evaluation -- have finished before the chain is freed.

Text from the CVE.org record (Linux).

How do I fix CVE-2026-23231?

Upgrade to a fixed release named by the vendor:

  • NetApp: ONTAP tools for VMware vSphere 10: 10.6
  • Red Hat: RHSA-2026:10756
  • Update affected NetApp products to a fixed release: ONTAP tools for VMware vSphere 10: 10.6. (NetApp)
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:10756 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisories for CVE-2026-23231

NetApp

1 advisory
  • Advisory severityHigh7.8

    High [CVE-2026-23231] Linux Kernel Vulnerability in NetApp Products

    NTAP-20260320-0013Source published Source updated

    Multiple NetApp products incorporate Linux kernel. Certain versions of linux kernel are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). Affected products: Active IQ Unified Manager for VMware vSphere, ONTAP tools for VMware vSphere 10. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    • Active IQ Unified Manager for VMware vSphere
    • ONTAP tools for VMware vSphere 10
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • ONTAP tools for VMware vSphere 10: 10.6
    Mitigation guidance
    • Update affected NetApp products to a fixed release: ONTAP tools for VMware vSphere 10: 10.6.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-23231] Privilege escalation or denial of service via use-after-free in nf_tables_addchain

    CVE-2026-23231Source published

    Privilege escalation or denial of service via use-after-free in nf_tables_addchain(). Red Hat rates this moderate (CVSS 7.5). Weakness: CWE-416. Affected package(s): kernel-rt, kernel. Resolved in Red Hat advisory RHSA-2026:10756 — update the affected packages (`sudo dnf update`).

    Related products — impact not confirmed
    • Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 7
    • Red Hat Enterprise Linux 9
    • Red Hat Enterprise Linux 1

    1 more entries in the full advisory.

    Source-reported affected versions
    • kernel-rt-0:4.18.0-553.117.1.rt7.458.el8_10
    • kernel-0:4.18.0-193.195.1.el8_2
    • kernel-0:3.10.0-1160.148.1.el7
    • kernel-0:4.18.0-477.136.1.el8_8

    8 more entries in the full advisory.

    Source-reported fixed versions
    • RHSA-2026:10756
    Mitigation guidance
    • Update the affected package(s) to the fixed version shipped in RHSA-2026:10756 (`sudo dnf update` / `yum update`).
    Full advisory and evidenceOpen source bulletin

References

Timeline

  1. First vendor advisory listed by VulniPulse
  2. CVE record published
  3. CVE record last updated

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