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

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nf_tables_addchain函数存在释放后重用问题，可能导致控制平面或数据包路径出现空指针取消引用。

CVSS 7.8 · High EPSS 0.82% · P56

Public Exploits 1

ExploitDB · 1 EDB-52549 [local]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 91c7b38dc9f0de4f7f444b796d14476bc12df7bc< 2a6586ecfa4ce1413daaafee250d2590e05f1a33 affected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc< 7017745068a9068904e1e7a1b170a5785647cc81 affected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc< f3fe58ce37926a10115ede527d59b91bcc05400a affected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc< dbd0af8083dd201f07c49110b2ee93710abdff28 affected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc< 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b affected
91c7b38dc9f0de4f7f444b796d14476bc12df7bc< 71e99ee20fc3f662555118cf1159443250647533 affected
3.16 affected
< 3.16 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-23231

Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: fix use-after-free in nf_tables_addchain()
Source: CVE Program / CVE List V5
Vulnerability 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.
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nf_tables_addchain函数存在释放后重用问题，可能导致控制平面或数据包路径出现空指针取消引用。
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 91c7b38dc9f0de4f7f444b796d14476bc12df7bc ~ 2a6586ecfa4ce1413daaafee250d2590e05f1a33 -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-23231

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III. Intelligence Information for CVE-2026-23231

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Patches & Fixes for CVE-2026-23231 (6)

Same Patch Batch · Linux · 2026-03-04 · 9 CVEs total

CVE-2026-23236 7.3 HIGH fbdev: smscufx: properly copy ioctl memory to kernelspace
CVE-2026-23232 Revert "f2fs: block cache/dio write during f2fs_enable_checkpoint()"
CVE-2025-71238 scsi: qla2xxx: Fix bsg_done() causing double free
CVE-2026-23233 f2fs: fix to avoid mapping wrong physical block for swapfile
CVE-2026-23234 f2fs: fix to avoid UAF in f2fs_write_end_io()
CVE-2026-23235 f2fs: fix out-of-bounds access in sysfs attribute read/write
CVE-2026-23238 romfs: check sb_set_blocksize() return value
CVE-2026-23237 platform/x86: classmate-laptop: Add missing NULL pointer checks

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23231

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