ghsa-vqr2-8f3v-jcmc
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: Make global sysctls readonly in non-init netns
These sysctls point to global variables: - NF_SYSCTL_CT_MAX (&nf_conntrack_max) - NF_SYSCTL_CT_EXPECT_MAX (&nf_ct_expect_max) - NF_SYSCTL_CT_BUCKETS (&nf_conntrack_htable_size_user)
Because their data pointers are not updated to point to per-netns structures, they must be marked read-only in a non-init_net ns. Otherwise, changes in any net namespace are reflected in (leaked into) all other net namespaces. This problem has existed since the introduction of net namespaces.
The current logic marks them read-only only if the net namespace is owned by an unprivileged user (other than init_user_ns).
Commit d0febd81ae77 ("netfilter: conntrack: re-visit sysctls in unprivileged namespaces") "exposes all sysctls even if the namespace is unpriviliged." Since we need to mark them readonly in any case, we can forego the unprivileged user check altogether.
{
"affected": [],
"aliases": [
"CVE-2021-46975"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-02-27T19:04:07Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: Make global sysctls readonly in non-init netns\n\nThese sysctls point to global variables:\n- NF_SYSCTL_CT_MAX (\u0026nf_conntrack_max)\n- NF_SYSCTL_CT_EXPECT_MAX (\u0026nf_ct_expect_max)\n- NF_SYSCTL_CT_BUCKETS (\u0026nf_conntrack_htable_size_user)\n\nBecause their data pointers are not updated to point to per-netns\nstructures, they must be marked read-only in a non-init_net ns.\nOtherwise, changes in any net namespace are reflected in (leaked into)\nall other net namespaces. This problem has existed since the\nintroduction of net namespaces.\n\nThe current logic marks them read-only only if the net namespace is\nowned by an unprivileged user (other than init_user_ns).\n\nCommit d0febd81ae77 (\"netfilter: conntrack: re-visit sysctls in\nunprivileged namespaces\") \"exposes all sysctls even if the namespace is\nunpriviliged.\" Since we need to mark them readonly in any case, we can\nforego the unprivileged user check altogether.",
"id": "GHSA-vqr2-8f3v-jcmc",
"modified": "2024-02-27T21:31:27Z",
"published": "2024-02-27T21:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-46975"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/671c54ea8c7ff47bd88444f3fffb65bf9799ce43"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/68122479c128a929f8f7bdd951cfdc8dd0e75b8f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9b288479f7a901a14ce703938596438559d7df55"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/baea536cf51f8180ab993e374cb134b5edad25e2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3598eb3915cc0c0d8cab42f4a6258ff44c4033e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/da50f56e826e1db141693297afb99370ebc160dd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fbf85a34ce17c4cf0a37ee253f4c582bbfb8231b"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.