fkie_cve-2023-53200
Vulnerability from fkie_nvd
Published
2025-09-15 15:15
Modified
2025-09-15 15:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: x_tables: fix percpu counter block leak on error path when creating new netns
Here is the stack where we allocate percpu counter block:
+-< __alloc_percpu
+-< xt_percpu_counter_alloc
+-< find_check_entry # {arp,ip,ip6}_tables.c
+-< translate_table
And it can be leaked on this code path:
+-> ip6t_register_table
+-> translate_table # allocates percpu counter block
+-> xt_register_table # fails
there is no freeing of the counter block on xt_register_table fail.
Note: xt_percpu_counter_free should be called to free it like we do in
do_replace through cleanup_entry helper (or in __ip6t_unregister_table).
Probability of hitting this error path is low AFAICS (xt_register_table
can only return ENOMEM here, as it is not replacing anything, as we are
creating new netns, and it is hard to imagine that all previous
allocations succeeded and after that one in xt_register_table failed).
But it's worth fixing even the rare leak.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: fix percpu counter block leak on error path when creating new netns\n\nHere is the stack where we allocate percpu counter block:\n\n +-\u003c __alloc_percpu\n +-\u003c xt_percpu_counter_alloc\n +-\u003c find_check_entry # {arp,ip,ip6}_tables.c\n +-\u003c translate_table\n\nAnd it can be leaked on this code path:\n\n +-\u003e ip6t_register_table\n +-\u003e translate_table # allocates percpu counter block\n +-\u003e xt_register_table # fails\n\nthere is no freeing of the counter block on xt_register_table fail.\nNote: xt_percpu_counter_free should be called to free it like we do in\ndo_replace through cleanup_entry helper (or in __ip6t_unregister_table).\n\nProbability of hitting this error path is low AFAICS (xt_register_table\ncan only return ENOMEM here, as it is not replacing anything, as we are\ncreating new netns, and it is hard to imagine that all previous\nallocations succeeded and after that one in xt_register_table failed).\nBut it\u0027s worth fixing even the rare leak."
}
],
"id": "CVE-2023-53200",
"lastModified": "2025-09-15T15:22:27.090",
"metrics": {},
"published": "2025-09-15T15:15:46.400",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0af8c09c896810879387decfba8c942994bb61f5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3cc9610a87b7dde82f7360dd4eb6c2c27940ed57"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/512b6c4b83c91d007301ea7d7f095d16c3aceacd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e306dbee4c98025a9326386023a12ef4d887e9d1"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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