CVE-2023-52924

Advisory lineage Upstream: 0 Downstream: 17
Analyzed
Published: 05 Feb 2025, 09:07
Last modified:11 May 2026, 19:35

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.01% LOW
0% probability -0.04%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 Feb 2025, 09:07
Published
Vulnerability first disclosed
11 May 2026, 19:35
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Affected Systems

  • linux•linux

    ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < 94313a196b44184b5b52c1876da6a537701b425a | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < 1da4874d05da1526b11b82fc7f3c7ac38749ddf8 | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < b15ea4017af82011dd55225ce77cce3d4dfc169c | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < 7c7e658a36f8b1522bd3586d8137e5f93a25ddc5 | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < 59dab3bf0b8fc08eb802721c0532f13dd89209b8 | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < bd156ce9553dcaf2d6ee2c825d1a5a1718e86524 | ≥ 9d0982927e79049675cb6c6c04a0ebb3dad5a434, < 24138933b97b055d486e8064b4a1721702442a9b | 4.1

  • linux•linux_kernel

    ≥ 4.1, < 4.19.316 | ≥ 4.20, < 5.4.262 | ≥ 5.5, < 5.10.198 | ≥ 5.11, < 5.15.134 | ≥ 5.16, < 6.1.56 | ≥ 6.2, < 6.4.11 | 6.5:rc1 | 6.5:rc2 | 6.5:rc3 | 6.5:rc4 | 6.5:rc5

References (7)