CVE-2022-50838 (GCVE-0-2022-50838)
Vulnerability from cvelistv5
Published
2025-12-30 12:10
Modified
2025-12-30 12:10
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: stream: purge sk_error_queue in sk_stream_kill_queues()
Changheon Lee reported TCP socket leaks, with a nice repro.
It seems we leak TCP sockets with the following sequence:
1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket.
Each ACK will cook an skb put in error queue, from __skb_tstamp_tx().
__skb_tstamp_tx() is using skb_clone(), unless
SOF_TIMESTAMPING_OPT_TSONLY was also requested.
2) If the application is also using MSG_ZEROCOPY, then we put in the
error queue cloned skbs that had a struct ubuf_info attached to them.
Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc()
does a sock_hold().
As long as the cloned skbs are still in sk_error_queue,
socket refcount is kept elevated.
3) Application closes the socket, while error queue is not empty.
Since tcp_close() no longer purges the socket error queue,
we might end up with a TCP socket with at least one skb in
error queue keeping the socket alive forever.
This bug can be (ab)used to consume all kernel memory
and freeze the host.
We need to purge the error queue, with proper synchronization
against concurrent writers.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 7737b104c211fa843de268b897d601e070292a72 Version: 89be5c357de34718eaaaefed80737f432c5ab86f Version: 8b8b3d738e450d2c2ccdc75f0ab5a951746c2a96 Version: b631c603b5fb98d2bd709c35d384901965a3dd51 Version: daf15fa1fd997749e881aedd9f03f73a11240e82 Version: 3988164fe9ddf98ebf5b5cdede91ac38c5f08a7e Version: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 Version: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 Version: 24bcbe1cc69fa52dc4f7b5b2456678ed464724d8 Version: 6ba975e14f5ebb87143d737c493adf4031409a68 Version: 4437f3ead9e85c35fe0e3adfb98c0b97eaa267eb |
||
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stream: purge sk_error_queue in sk_stream_kill_queues()\n\nChangheon Lee reported TCP socket leaks, with a nice repro.\n\nIt seems we leak TCP sockets with the following sequence:\n\n1) SOF_TIMESTAMPING_TX_ACK is enabled on the socket.\n\n Each ACK will cook an skb put in error queue, from __skb_tstamp_tx().\n __skb_tstamp_tx() is using skb_clone(), unless\n SOF_TIMESTAMPING_OPT_TSONLY was also requested.\n\n2) If the application is also using MSG_ZEROCOPY, then we put in the\n error queue cloned skbs that had a struct ubuf_info attached to them.\n\n Whenever an struct ubuf_info is allocated, sock_zerocopy_alloc()\n does a sock_hold().\n\n As long as the cloned skbs are still in sk_error_queue,\n socket refcount is kept elevated.\n\n3) Application closes the socket, while error queue is not empty.\n\nSince tcp_close() no longer purges the socket error queue,\nwe might end up with a TCP socket with at least one skb in\nerror queue keeping the socket alive forever.\n\nThis bug can be (ab)used to consume all kernel memory\nand freeze the host.\n\nWe need to purge the error queue, with proper synchronization\nagainst concurrent writers."
}
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"providerMetadata": {
"dateUpdated": "2025-12-30T12:10:57.721Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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},
{
"url": "https://git.kernel.org/stable/c/e0c8bccd40fc1c19e1d246c39bcf79e357e1ada3"
}
],
"title": "net: stream: purge sk_error_queue in sk_stream_kill_queues()",
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"cveId": "CVE-2022-50838",
"datePublished": "2025-12-30T12:10:57.721Z",
"dateReserved": "2025-12-30T12:06:07.133Z",
"dateUpdated": "2025-12-30T12:10:57.721Z",
"state": "PUBLISHED"
},
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}
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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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