CVE-2023-52924 (GCVE-0-2023-52924)
Vulnerability from cvelistv5
Published
2025-02-05 09:07
Modified
2025-05-04 07:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 Version: 9d0982927e79049675cb6c6c04a0ebb3dad5a434 |
||||||
|
|||||||||
{
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"programFiles": [
"net/netfilter/nf_tables_api.c",
"net/netfilter/nft_set_hash.c",
"net/netfilter/nft_set_pipapo.c",
"net/netfilter/nft_set_rbtree.c"
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{
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"version": "5.4.262",
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},
{
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"version": "5.10.198",
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},
{
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"version": "5.15.134",
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{
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}
]
}
],
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: don\u0027t skip expired elements during walk\n\nThere is an asymmetry between commit/abort and preparation phase if the\nfollowing conditions are met:\n\n1. set is a verdict map (\"1.2.3.4 : jump foo\")\n2. timeouts are enabled\n\nIn this case, following sequence is problematic:\n\n1. element E in set S refers to chain C\n2. userspace requests removal of set S\n3. kernel does a set walk to decrement chain-\u003euse count for all elements\n from preparation phase\n4. kernel does another set walk to remove elements from the commit phase\n (or another walk to do a chain-\u003euse increment for all elements from\n abort phase)\n\nIf E has already expired in 1), it will be ignored during list walk, so its use count\nwon\u0027t have been changed.\n\nThen, when set is culled, -\u003edestroy callback will zap the element via\nnf_tables_set_elem_destroy(), but this function is only safe for\nelements that have been deactivated earlier from the preparation phase:\nlack of earlier deactivate removes the element but leaks the chain use\ncount, which results in a WARN splat when the chain gets removed later,\nplus a leak of the nft_chain structure.\n\nUpdate pipapo_get() not to skip expired elements, otherwise flush\ncommand reports bogus ENOENT errors."
}
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{
"url": "https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5"
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{
"url": "https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8"
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"url": "https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524"
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{
"url": "https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b"
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"title": "netfilter: nf_tables: don\u0027t skip expired elements during walk",
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"cveId": "CVE-2023-52924",
"datePublished": "2025-02-05T09:07:55.418Z",
"dateReserved": "2024-08-21T06:07:11.018Z",
"dateUpdated": "2025-05-04T07:46:06.745Z",
"state": "PUBLISHED"
},
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