ghsa-wqmj-2mp9-xqmr
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bpf: must hold reference on net namespace
BUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0 Read of size 8 at addr ffff8880106fe400 by task repro/72= bpf_nf_link_release+0xda/0x1e0 bpf_link_free+0x139/0x2d0 bpf_link_release+0x68/0x80 __fput+0x414/0xb60
Eric says: It seems that bpf was able to defer the __nf_unregister_net_hook() after exit()/close() time. Perhaps a netns reference is missing, because the netns has been dismantled/freed already. bpf_nf_link_attach() does : link->net = net; But I do not see a reference being taken on net.
Add such a reference and release it after hook unreg. Note that I was unable to get syzbot reproducer to work, so I do not know if this resolves this splat.
{ "affected": [], "aliases": [ "CVE-2024-50130" ], "database_specific": { "cwe_ids": [ "CWE-416" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-11-05T18:15:15Z", "severity": "HIGH" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: must hold reference on net namespace\n\nBUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0\nRead of size 8 at addr ffff8880106fe400 by task repro/72=\nbpf_nf_link_release+0xda/0x1e0\nbpf_link_free+0x139/0x2d0\nbpf_link_release+0x68/0x80\n__fput+0x414/0xb60\n\nEric says:\n It seems that bpf was able to defer the __nf_unregister_net_hook()\n after exit()/close() time.\n Perhaps a netns reference is missing, because the netns has been\n dismantled/freed already.\n bpf_nf_link_attach() does :\n link-\u003enet = net;\n But I do not see a reference being taken on net.\n\nAdd such a reference and release it after hook unreg.\nNote that I was unable to get syzbot reproducer to work, so I\ndo not know if this resolves this splat.", "id": "GHSA-wqmj-2mp9-xqmr", "modified": "2024-11-08T00:30:45Z", "published": "2024-11-05T18:32:12Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50130" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/1230fe7ad3974f7bf6c78901473e039b34d4fb1f" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/d0d7939543a1b3bb93af9a18d258a774daf8f162" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/f41bd93b3e0508edc7ba820357f949071dcc0acc" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "type": "CVSS_V3" } ] }
Sightings
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