ghsa-f84f-657f-x94w
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
libceph: fix invalid accesses to ceph_connection_v1_info
There is a place where generic code in messenger.c is reading and another place where it is writing to con->v1 union member without checking that the union member is active (i.e. msgr1 is in use).
On 64-bit systems, con->v1.auth_retry overlaps with con->v2.out_iter, so such a read is almost guaranteed to return a bogus value instead of 0 when msgr2 is in use. This ends up being fairly benign because the side effect is just the invalidation of the authorizer and successive fetching of new tickets.
con->v1.connect_seq overlaps with con->v2.conn_bufs and the fact that it's being written to can cause more serious consequences, but luckily it's not something that happens often.
{
"affected": [],
"aliases": [
"CVE-2025-39880"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-23T06:15:47Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix invalid accesses to ceph_connection_v1_info\n\nThere is a place where generic code in messenger.c is reading and\nanother place where it is writing to con-\u003ev1 union member without\nchecking that the union member is active (i.e. msgr1 is in use).\n\nOn 64-bit systems, con-\u003ev1.auth_retry overlaps with con-\u003ev2.out_iter,\nso such a read is almost guaranteed to return a bogus value instead of\n0 when msgr2 is in use. This ends up being fairly benign because the\nside effect is just the invalidation of the authorizer and successive\nfetching of new tickets.\n\ncon-\u003ev1.connect_seq overlaps with con-\u003ev2.conn_bufs and the fact that\nit\u0027s being written to can cause more serious consequences, but luckily\nit\u0027s not something that happens often.",
"id": "GHSA-f84f-657f-x94w",
"modified": "2025-10-02T15:31:14Z",
"published": "2025-09-23T06:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39880"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/23538cfbeed87159a5ac6c61e7a6de3d8d4486a8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35dbbc3dbf8bccb2d77c68444f42c1e6d2d27983"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/591ea9c30737663a471b2bb07b27ddde86b020d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bd8b56899be0b514945f639a89ccafb8f8dfaef"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cdbc9836c7afadad68f374791738f118263c5371"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ea12ab684f8ae8a6da11a22c78d94a79e2163096"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- 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.