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  4. CVE 2026 23412 netfilter bpf defer hook memory release until rcu
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Back to active CVEs
High · CVSS 7.8CVE-2026-23412

netfilter: bpf: defer hook memory release until rcu readers are doneCVE-2026-23412

Answer in brief

CVE-2026-23412 records a High severity (CVSS 7.8) vulnerability in netfilter: bpf: defer hook memory release until rcu readers are done. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 2, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric6.4Not reported
Linux/Linuxgeneric>=84601d6ee68ae820dec97450934797046d62db4b <d016c216bc75c45128160593a77b864a04dbe7c0 || >=84601d6ee68ae820dec97450934797046d62db4b <cb2bf5efdb02a2a59faf603604a1066e8266f349 || >=84601d6ee68ae820dec97450934797046d62db4b <c25e0dec366ae99b7264324ce3c7cbaea34691f9 || >=84601d6ee68ae820dec97450934797046d62db4b <54244d54a971c26a0cd0a9073460ff71f3c51b32 || >=84601d6ee68ae820dec97450934797046d62db4b <24f90fa3994b992d1a09003a3db2599330a5232ad016c216bc75c45128160593a77b864a04dbe7c0, cb2bf5efdb02a2a59faf603604a1066e8266f349, c25e0dec366ae99b7264324ce3c7cbaea34691f9, 54244d54a971c26a0cd0a9073460ff71f3c51b32, 24f90fa3994b992d1a09003a3db2599330a5232a

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to d016c216bc75c45128160593a77b864a04dbe7c0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfilter: bpf: defer hook memory release until rcu readers are done Yiming Qian reports UaF when concurrent process is dumping hooks via nfnetlink_hooks: BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0 Read of size 8 at addr ffff888003edbf88 by task poc/79 Call Trace: <TASK> nfnl_hook_dump_one.isra.0+0xe71/0x10f0 netlink_dump+0x554/0x12b0 nfnl_hook_get+0x176/0x230 [..] Defer release until after concurrent readers have completed.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 16, 2026
References
5 linked sources
Open source record