GHSA-PMP7-XX3C-WR9Q
Vulnerability from github – Published: 2024-03-11 18:31 – Updated: 2024-03-11 18:31In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: reject QUEUE/DROP verdict parameters
This reverts commit e0abdadcc6e1.
core.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP verdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar, or 0.
Due to the reverted commit, its possible to provide a positive value, e.g. NF_ACCEPT (1), which results in use-after-free.
Its not clear to me why this commit was made.
NF_QUEUE is not used by nftables; "queue" rules in nftables will result in use of "nft_queue" expression.
If we later need to allow specifiying errno values from userspace (do not know why), this has to call NF_DROP_GETERR and check that "err <= 0" holds true.
{
"affected": [],
"aliases": [
"CVE-2024-26609"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-11T18:15:19Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: reject QUEUE/DROP verdict parameters\n\nThis reverts commit e0abdadcc6e1.\n\ncore.c:nf_hook_slow assumes that the upper 16 bits of NF_DROP\nverdicts contain a valid errno, i.e. -EPERM, -EHOSTUNREACH or similar,\nor 0.\n\nDue to the reverted commit, its possible to provide a positive\nvalue, e.g. NF_ACCEPT (1), which results in use-after-free.\n\nIts not clear to me why this commit was made.\n\nNF_QUEUE is not used by nftables; \"queue\" rules in nftables\nwill result in use of \"nft_queue\" expression.\n\nIf we later need to allow specifiying errno values from userspace\n(do not know why), this has to call NF_DROP_GETERR and check that\n\"err \u003c= 0\" holds true.",
"id": "GHSA-pmp7-xx3c-wr9q",
"modified": "2024-03-11T18:31:10Z",
"published": "2024-03-11T18:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26609"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4e66422f1b56149761dc76030e6345d1cca6f869"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55a60251fa50d4e68175e36666b536a602ce4f6c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6653118b176a00915125521c6572ae8e507621db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8365e9d92b85fda975a5ece7a3a139cb964018c8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8e34430e33b8a80bc014f3efe29cac76bc30a4b4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/960cf4f812530f01f6acc6878ceaa5404c06af7b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f05a497e7bc8851eeeb3a58da180ba469efebb05"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f342de4e2f33e0e39165d8639387aa6c19dff660"
}
],
"schema_version": "1.4.0",
"severity": []
}
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