302 lines
17 KiB
JSON
302 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47222",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-04-10T18:59:19.529Z",
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"datePublished": "2024-05-21T14:19:28.214Z",
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"dateUpdated": "2026-08-05T08:46:47.766Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:46:47.766Z"
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},
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"descriptions": [
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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: bridge: fix vlan tunnel dst refcnt when egressing\n\nThe egress tunnel code uses dst_clone() and directly sets the result\nwhich is wrong because the entry might have 0 refcnt or be already deleted,\ncausing number of problems. It also triggers the WARN_ON() in dst_hold()[1]\nwhen a refcnt couldn't be taken. Fix it by using dst_hold_safe() and\nchecking if a reference was actually taken before setting the dst.\n\n[1] dmesg WARN_ON log and following refcnt errors\n WARNING: CPU: 5 PID: 38 at include/net/dst.h:230 br_handle_egress_vlan_tunnel+0x10b/0x134 [bridge]\n Modules linked in: 8021q garp mrp bridge stp llc bonding ipv6 virtio_net\n CPU: 5 PID: 38 Comm: ksoftirqd/5 Kdump: loaded Tainted: G W 5.13.0-rc3+ #360\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\n RIP: 0010:br_handle_egress_vlan_tunnel+0x10b/0x134 [bridge]\n Code: e8 85 bc 01 e1 45 84 f6 74 90 45 31 f6 85 db 48 c7 c7 a0 02 19 a0 41 0f 94 c6 31 c9 31 d2 44 89 f6 e8 64 bc 01 e1 85 db 75 02 <0f> 0b 31 c9 31 d2 44 89 f6 48 c7 c7 70 02 19 a0 e8 4b bc 01 e1 49\n RSP: 0018:ffff8881003d39e8 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffa01902a0\n RBP: ffff8881040c6700 R08: 0000000000000000 R09: 0000000000000001\n R10: 2ce93d0054fe0d00 R11: 54fe0d00000e0000 R12: ffff888109515000\n R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000401\n FS: 0000000000000000(0000) GS:ffff88822bf40000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f42ba70f030 CR3: 0000000109926000 CR4: 00000000000006e0\n Call Trace:\n br_handle_vlan+0xbc/0xca [bridge]\n __br_forward+0x23/0x164 [bridge]\n deliver_clone+0x41/0x48 [bridge]\n br_handle_frame_finish+0x36f/0x3aa [bridge]\n ? skb_dst+0x2e/0x38 [bridge]\n ? br_handle_ingress_vlan_tunnel+0x3e/0x1c8 [bridge]\n ? br_handle_frame_finish+0x3aa/0x3aa [bridge]\n br_handle_frame+0x2c3/0x377 [bridge]\n ? __skb_pull+0x33/0x51\n ? vlan_do_receive+0x4f/0x36a\n ? br_handle_frame_finish+0x3aa/0x3aa [bridge]\n __netif_receive_skb_core+0x539/0x7c6\n ? __list_del_entry_valid+0x16e/0x1c2\n __netif_receive_skb_list_core+0x6d/0xd6\n netif_receive_skb_list_internal+0x1d9/0x1fa\n gro_normal_list+0x22/0x3e\n dev_gro_receive+0x55b/0x600\n ? detach_buf_split+0x58/0x140\n napi_gro_receive+0x94/0x12e\n virtnet_poll+0x15d/0x315 [virtio_net]\n __napi_poll+0x2c/0x1c9\n net_rx_action+0xe6/0x1fb\n __do_softirq+0x115/0x2d8\n run_ksoftirqd+0x18/0x20\n smpboot_thread_fn+0x183/0x19c\n ? smpboot_unregister_percpu_thread+0x66/0x66\n kthread+0x10a/0x10f\n ? kthread_mod_delayed_work+0xb6/0xb6\n ret_from_fork+0x22/0x30\n ---[ end trace 49f61b07f775fd2b ]---\n dst_release: dst:00000000c02d677a refcnt:-1\n dst_release underflow"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is a race between bridge VLAN-tunnel deletion (rtnetlink RTM_SETLINK/DELLINK under RTNL) and the softirq egress path in br_handle_egress_vlan_tunnel(); a remote peer can only send frames and cannot drop tunnel_dst, so both sides must be driven locally via netlink.\nAC:L - An attacker who owns the netns controls both racing sides—flooding frames through a BR_VLAN_TUNNEL port while concurrently deleting vlan tunnel info—so the race is freely repeatable with no attacker-uncontrollable precondition.\nPR:L - Bridge creation, VLAN filtering, BR_VLAN_TUNNEL, and tunnel-id add/delete need only CAP_NET_ADMIN in the owning user/net namespace, which an unprivileged user obtains with unshare -Urn; real init-ns root is not required.\nUI:N - The attacker performs namespace setup, bridge/VLAN-tunnel configuration, traffic generation, and tunnel deletion entirely themselves; no victim interaction is required.\nS:U - The resulting metadata_dst use-after-free and refcnt underflow corrupt kernel heap within the same kernel security authority, with no VM/IOMMU/sandbox boundary crossed.\nC:H - dst_clone() still returns the dst after a failed hold, leaving the skb with a dangling metadata_dst that is freed via RCU; reclaiming that slab yields an arbitrary kernel-read primitive, so confidentiality impact is High.\nI:H - The dangling dst is later used for tunnel metadata on egress and released via dst_release, so an attacker-controlled reallocation provides write/corruption primitives suitable for control-flow hijack; integrity impact is High.\nA:H - The failed hold triggers WARN_ON in dst_hold(), dst_release underflow, and a softirq use-after-free that reliably oopses/panics the kernel and can be retriggered at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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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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"net/bridge/br_vlan_tunnel.c"
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],
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"versions": [
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{
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"version": "11538d039ac6efcf4f1a6c536e1b87cd3668a9fd",
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"lessThan": "42020f7f37a90d24b9551f5f7eba3f7c7c102968",
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"version": "0",
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},
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},
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},
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}
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],
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"title": "net: bridge: fix vlan tunnel dst refcnt when egressing",
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47222",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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"Automatable": "no"
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"Technical Impact": "partial"
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:40:13.415831Z"
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"dateUpdated": "2024-09-11T17:32:48.159Z"
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