194 lines
9.5 KiB
JSON
194 lines
9.5 KiB
JSON
{
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"cveId": "CVE-2022-48779",
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"state": "PUBLISHED",
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"dateReserved": "2024-06-20T11:09:39.062Z",
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"datePublished": "2024-07-16T11:13:17.173Z",
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"dateUpdated": "2026-08-05T08:52:13.141Z"
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mscc: ocelot: fix use-after-free in ocelot_vlan_del()\n\nocelot_vlan_member_del() will free the struct ocelot_bridge_vlan, so if\nthis is the same as the port's pvid_vlan which we access afterwards,\nwhat we're accessing is freed memory.\n\nFix the bug by determining whether to clear ocelot_port->pvid_vlan prior\nto calling ocelot_vlan_member_del()."
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is reached only through local VLAN configuration (bridge switchdev PORT_VLAN delete or ndo_vlan_rx_kill_vid → ocelot_vlan_del/felix_vlan_del), not by processing remote or adjacent-link packets.\nAC:L - An attacker who can add then delete a PVID VLAN as the last member deterministically frees struct ocelot_bridge_vlan and then dereferences ocelot_port->pvid_vlan; no attacker-uncontrollable race or external condition is required.\nPR:L - VLAN delete is gated by CAP_NET_ADMIN via netlink_ns_capable in the device’s user_ns; Felix/ocelot ports are not NETIF_F_NETNS_LOCAL, so a delegated port in a user-namespace-owned netns yields NET_ADMIN without init-namespace root (same model as CVE-2022-49141/CVE-2026-22982).\nUI:N - The attacker performs the bridge/8021q VLAN delete themselves; no separate victim action is required.\nS:U - This is a standard in-kernel heap use-after-free within the host OS authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - ocelot_vlan_member_del() frees the ocelot_bridge_vlan while pvid_vlan still points at it, so the subsequent vid read (and later ocelot_port_set_pvid uses of a dangling pointer) is a classic UAF enabling arbitrary kernel read via heap reuse.\nI:H - The dangling pvid_vlan pointer can persist when freed memory is reused with a non-matching vid, and later reads of attacker-controlled object contents influence kernel/hardware VLAN state, yielding standard UAF write/control-flow primitives under heap spraying.\nA:H - Use-after-free of the VLAN object can oops/panic the kernel even without a full exploit, so availability impact is High per UAF guidance."
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}
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]
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}
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],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ethernet/mscc/ocelot.c"
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