ghsa-24v3-p69g-7cx6
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
sctp: sysctl: plpmtud_probe_interval: avoid using current->nsproxy
As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons:
-
Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns.
-
current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2).
The 'net' structure can be obtained from the table->data using container_of().
Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.probe_interval' is used.
{
"affected": [],
"aliases": [
"CVE-2025-21636"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-19T11:15:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: plpmtud_probe_interval: avoid using current-\u003ensproxy\n\nAs mentioned in a previous commit of this series, using the \u0027net\u0027\nstructure via \u0027current\u0027 is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader\u0027s/writer\u0027s netns vs only\n from the opener\u0027s netns.\n\n- current-\u003ensproxy can be NULL in some cases, resulting in an \u0027Oops\u0027\n (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n syzbot [1] using acct(2).\n\nThe \u0027net\u0027 structure can be obtained from the table-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata could also be used directly, as this is the only\nmember needed from the \u0027net\u0027 structure, but that would increase the size\nof this fix, to use \u0027*data\u0027 everywhere \u0027net-\u003esctp.probe_interval\u0027 is\nused.",
"id": "GHSA-24v3-p69g-7cx6",
"modified": "2025-01-23T18:31:17Z",
"published": "2025-01-19T12:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21636"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- 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.