GHSA-7JV7-GR8J-4554
Vulnerability from github – Published: 2024-07-16 12:30 – Updated: 2024-08-07 21:31In the Linux kernel, the following vulnerability has been resolved:
net: fix a memleak when uncloning an skb dst and its metadata
When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb.
The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak.
Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.
{
"affected": [],
"aliases": [
"CVE-2022-48809"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-16T12:15:05Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a memleak when uncloning an skb dst and its metadata\n\nWhen uncloning an skb dst and its associated metadata, a new\ndst+metadata is allocated and later replaces the old one in the skb.\nThis is helpful to have a non-shared dst+metadata attached to a specific\nskb.\n\nThe issue is the uncloned dst+metadata is initialized with a refcount of\n1, which is increased to 2 before attaching it to the skb. When\ntun_dst_unclone returns, the dst+metadata is only referenced from a\nsingle place (the skb) while its refcount is 2. Its refcount will never\ndrop to 0 (when the skb is consumed), leading to a memory leak.\n\nFix this by removing the call to dst_hold in tun_dst_unclone, as the\ndst+metadata refcount is already 1.",
"id": "GHSA-7jv7-gr8j-4554",
"modified": "2024-08-07T21:31:43Z",
"published": "2024-07-16T12:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48809"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314"
}
],
"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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