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CVE-2026-23412— netfilter: bpf: defer hook memory release until rcu readers are done

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter bpf延迟释放内存，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 84601d6ee68ae820dec97450934797046d62db4b< d016c216bc75c45128160593a77b864a04dbe7c0 affected
84601d6ee68ae820dec97450934797046d62db4b< cb2bf5efdb02a2a59faf603604a1066e8266f349 affected
84601d6ee68ae820dec97450934797046d62db4b< c25e0dec366ae99b7264324ce3c7cbaea34691f9 affected
84601d6ee68ae820dec97450934797046d62db4b< 54244d54a971c26a0cd0a9073460ff71f3c51b32 affected
84601d6ee68ae820dec97450934797046d62db4b< 24f90fa3994b992d1a09003a3db2599330a5232a affected
6.4 affected
< 6.4 unaffected
6.6.130≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-23412

Vulnerability Information
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Vulnerability Title
netfilter: bpf: defer hook memory release until rcu readers are done
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于netfilter bpf延迟释放内存，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 84601d6ee68ae820dec97450934797046d62db4b ~ d016c216bc75c45128160593a77b864a04dbe7c0 -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-23412

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-23412

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Same Patch Batch · Linux · 2026-04-02 · 6 CVEs total

CVE-2026-23415 7.8 HIGH futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
CVE-2026-23413 7.8 HIGH clsact: Fix use-after-free in init/destroy rollback asymmetry
CVE-2026-23414 7.5 HIGH tls: Purge async_hold in tls_decrypt_async_wait()
CVE-2026-23417 bpf: Fix constant blinding for PROBE_MEM32 stores
CVE-2026-23416 mm/mseal: update VMA end correctly on merge

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23412

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