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CVE-2023-52924— netfilter: nf_tables: don't skip expired elements during walk

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，该漏洞源于遍历过期元素时的逻辑错误。攻击者利用该漏洞可以导致内存泄漏或拒绝服务。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.20% · P10

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 9d0982927e79049675cb6c6c04a0ebb3dad5a434< 94313a196b44184b5b52c1876da6a537701b425a affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< 1da4874d05da1526b11b82fc7f3c7ac38749ddf8 affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< b15ea4017af82011dd55225ce77cce3d4dfc169c affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< 7c7e658a36f8b1522bd3586d8137e5f93a25ddc5 affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< 59dab3bf0b8fc08eb802721c0532f13dd89209b8 affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< bd156ce9553dcaf2d6ee2c825d1a5a1718e86524 affected
9d0982927e79049675cb6c6c04a0ebb3dad5a434< 24138933b97b055d486e8064b4a1721702442a9b affected
4.1 affected
… +8 more rows
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I. Basic Information for CVE-2023-52924

Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: don't skip expired elements during walk
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: don't skip expired elements during walk There is an asymmetry between commit/abort and preparation phase if the following conditions are met: 1. set is a verdict map ("1.2.3.4 : jump foo") 2. timeouts are enabled In this case, following sequence is problematic: 1. element E in set S refers to chain C 2. userspace requests removal of set S 3. kernel does a set walk to decrement chain->use count for all elements from preparation phase 4. kernel does another set walk to remove elements from the commit phase (or another walk to do a chain->use increment for all elements from abort phase) If E has already expired in 1), it will be ignored during list walk, so its use count won't have been changed. Then, when set is culled, ->destroy callback will zap the element via nf_tables_set_elem_destroy(), but this function is only safe for elements that have been deactivated earlier from the preparation phase: lack of earlier deactivate removes the element but leaks the chain use count, which results in a WARN splat when the chain gets removed later, plus a leak of the nft_chain structure. Update pipapo_get() not to skip expired elements, otherwise flush command reports bogus ENOENT errors.
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，该漏洞源于遍历过期元素时的逻辑错误。攻击者利用该漏洞可以导致内存泄漏或拒绝服务。
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 9d0982927e79049675cb6c6c04a0ebb3dad5a434 ~ 94313a196b44184b5b52c1876da6a537701b425a -
Linux Linux 4.1 -

II. Public POCs for CVE-2023-52924

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III. Intelligence Information for CVE-2023-52924

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Patches & Fixes for CVE-2023-52924 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52924

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