CVE - CVE-2023-52924

CVE-ID
CVE-2023-52924	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1da4874d05da1526b11b82fc7f3c7ac38749ddf8 URL:https://git.kernel.org/stable/c/1da4874d05da1526b11b82fc7f3c7ac38749ddf8 MISC:https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b URL:https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b MISC:https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8 URL:https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8 MISC:https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5 URL:https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5 MISC:https://git.kernel.org/stable/c/94313a196b44184b5b52c1876da6a537701b425a URL:https://git.kernel.org/stable/c/94313a196b44184b5b52c1876da6a537701b425a MISC:https://git.kernel.org/stable/c/b15ea4017af82011dd55225ce77cce3d4dfc169c URL:https://git.kernel.org/stable/c/b15ea4017af82011dd55225ce77cce3d4dfc169c MISC:https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524 URL:https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524
Assigning CNA
kernel.org
Date Record Created
20240821	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240821)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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