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CVE-2026-23399— nf_tables: nft_dynset: fix possible stateful expression memleak in error path

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nft_dynset错误路径中可能发生状态表达式内存泄漏。

AI Predicted 4.4 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 563125a73ac30d7036ae69ca35c40500562c1de4< eb7bf413e59945df03d4567b73ce464eebe2f4ea affected
563125a73ac30d7036ae69ca35c40500562c1de4< 4357dbb1d9c35ca0b4443d71c98a48e6666f7689 affected
563125a73ac30d7036ae69ca35c40500562c1de4< e6661add2d9c6913e1dad97336595e23a2bed195 affected
563125a73ac30d7036ae69ca35c40500562c1de4< d1354873cbe3b344899c4311ac05897fd83e3f21 affected
563125a73ac30d7036ae69ca35c40500562c1de4< 31641c682db73353e4647e40735c7f2a75ff58ef affected
563125a73ac30d7036ae69ca35c40500562c1de4< c88a9fd26cee365bec932196f76175772a941cca affected
563125a73ac30d7036ae69ca35c40500562c1de4< 0548a13b5a145b16e4da0628b5936baf35f51b43 affected
5.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-23399

Vulnerability Information
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Vulnerability Title
nf_tables: nft_dynset: fix possible stateful expression memleak in error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nf_tables: nft_dynset: fix possible stateful expression memleak in error path If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.   unreferenced object (percpu) 0x607b97e9cab8 (size 16):     comm "softirq", pid 0, jiffies 4294931867     hex dump (first 16 bytes on cpu 3):       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     backtrace (crc 0):       pcpu_alloc_noprof+0x453/0xd80       nft_counter_clone+0x9c/0x190 [nf_tables]       nft_expr_clone+0x8f/0x1b0 [nf_tables]       nft_dynset_new+0x2cb/0x5f0 [nf_tables]       nft_rhash_update+0x236/0x11c0 [nf_tables]       nft_dynset_eval+0x11f/0x670 [nf_tables]       nft_do_chain+0x253/0x1700 [nf_tables]       nft_do_chain_ipv4+0x18d/0x270 [nf_tables]       nf_hook_slow+0xaa/0x1e0       ip_local_deliver+0x209/0x330
Source: CVE Program / CVE List V5
CVSS Information
N/A
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nft_dynset错误路径中可能发生状态表达式内存泄漏。
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 563125a73ac30d7036ae69ca35c40500562c1de4 ~ eb7bf413e59945df03d4567b73ce464eebe2f4ea -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-23399

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III. Intelligence Information for CVE-2026-23399

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Patches & Fixes for CVE-2026-23399 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23399

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