ghsa-prq2-qj2r-jcgv
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-12-30 21:30
Severity ?
VLAI Severity ?
Details
In the Linux kernel, the following vulnerability has been resolved:
net: rds: fix memory leak in rds_recvmsg
Syzbot reported memory leak in rds. The problem was in unputted refcount in case of error.
int rds_recvmsg(struct socket sock, struct msghdr msg, size_t size, int msg_flags) { ...
if (!rds_next_incoming(rs, &inc)) {
...
}
After this "if" inc refcount incremented and
if (rds_cmsg_recv(inc, msg, rs)) {
ret = -EFAULT;
goto out;
}
... out: return ret; }
in case of rds_cmsg_recv() fail the refcount won't be decremented. And it's easy to see from ftrace log, that rds_inc_addref() don't have rds_inc_put() pair in rds_recvmsg() after rds_cmsg_recv()
1) | rds_recvmsg() { 1) 3.721 us | rds_inc_addref(); 1) 3.853 us | rds_message_inc_copy_to_user(); 1) + 10.395 us | rds_cmsg_recv(); 1) + 34.260 us | }
{
"affected": [],
"aliases": [
"CVE-2021-47249"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T15:15:13Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: rds: fix memory leak in rds_recvmsg\n\nSyzbot reported memory leak in rds. The problem\nwas in unputted refcount in case of error.\n\nint rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,\n\t\tint msg_flags)\n{\n...\n\n\tif (!rds_next_incoming(rs, \u0026inc)) {\n\t\t...\n\t}\n\nAfter this \"if\" inc refcount incremented and\n\n\tif (rds_cmsg_recv(inc, msg, rs)) {\n\t\tret = -EFAULT;\n\t\tgoto out;\n\t}\n...\nout:\n\treturn ret;\n}\n\nin case of rds_cmsg_recv() fail the refcount won\u0027t be\ndecremented. And it\u0027s easy to see from ftrace log, that\nrds_inc_addref() don\u0027t have rds_inc_put() pair in\nrds_recvmsg() after rds_cmsg_recv()\n\n 1) | rds_recvmsg() {\n 1) 3.721 us | rds_inc_addref();\n 1) 3.853 us | rds_message_inc_copy_to_user();\n 1) + 10.395 us | rds_cmsg_recv();\n 1) + 34.260 us | }",
"id": "GHSA-prq2-qj2r-jcgv",
"modified": "2024-12-30T21:30:46Z",
"published": "2024-05-21T15:31:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47249"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/06b7cb0194bd1ede0dd27f3a946e7c0279fba44a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1f79bc8ae81c05eb112a53f981cb2c244ee50d02"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2038cd15eacdf7512755c27686822e0052eb9042"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/423c6939758fb3b9cf5abbd1e7792068a5c4ae8c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/49bfcbfd989a8f1f23e705759a6bb099de2cff9f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5946fbf48355f5a8caeff72580c7658da5966b86"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c3ec88b03e9e4ca117dcdc4204fd3edcd02084f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b25b60d076164edb3025e85aabd2cf50a5215b91"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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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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