ghsa-7jv7-gr8j-4554
Vulnerability from github
In 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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