{
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          "dateUpdated": "2024-08-04T05:32:07.465Z",
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        "title": "CVE Program Container"
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      {
        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2021-47222",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:40:13.415831Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_vlan_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_vlan_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.238",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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\u0027t 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 \u003c0f\u003e 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T07:37:41.277Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/42020f7f37a90d24b9551f5f7eba3f7c7c102968"
        },
        {
          "url": "https://git.kernel.org/stable/c/84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/79855be6445b6592bddb7bd7167083ec8cdbd73f"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579"
        },
        {
          "url": "https://git.kernel.org/stable/c/25053a8404ba17ca48f5553d487afc1882e9f56c"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfc579f9d89af4ada58c69b03bcaa4887840f3b3"
        }
      ],
      "title": "net: bridge: fix vlan tunnel dst refcnt when egressing",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47222",
    "datePublished": "2024-05-21T14:19:28.214Z",
    "dateReserved": "2024-04-10T18:59:19.529Z",
    "dateUpdated": "2024-12-19T07:37:41.277Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47222\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:11.453\",\"lastModified\":\"2025-04-29T19:13:04.043\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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\u0027t 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 \u003c0f\u003e 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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: bridge: corrige el refcnt dst del t\u00fanel vlan al salir El c\u00f3digo del t\u00fanel de salida usa dst_clone() y establece directamente el resultado que es incorrecto porque la entrada puede tener 0 refcnt o ya estar eliminada , causando varios problemas. Tambi\u00e9n activa WARN_ON() en dst_hold()[1] cuando no se puede tomar una referencia. Solucionelo usando dst_hold_safe() y verificando si realmente se tom\u00f3 una referencia antes de configurar el dst. [1] Registro dmesg WARN_ON y siguientes errores de referencia ADVERTENCIA: CPU: 5 PID: 38 en include/net/dst.h:230 br_handle_egress_vlan_tunnel+0x10b/0x134 [puente] M\u00f3dulos vinculados en: 8021q garp mrp bridge stp llc bonding ipv6 virtio_net CPU : 5 PID: 38 Comm: ksoftirqd/5 Kdump: cargado Contaminado: GW 5.13.0-rc3+ #360 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 01/04/2014 RIP: 0010:br_handle_egress_vlan_tunnel+0x10b/0x134 [puente] C\u00f3digo: 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 f6 e8 64 a.C. 01 e1 85 db 75 02 \u0026lt;0f\u0026gt; 0b 31 c9 31 d2 44 89 f6 48 c7 c7 70 02 19 a0 e8 4b bc 01 e1 49 RSP: 0018:ffff8881003d39e8 EFLAGS: 00010246 RAX: 00000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffa01902a0 RBP: ffff8881040c6700 R08: 0000000000000000 R09: 00000000000000001 R10: 2ce93d0054fe0d00 R11: d00000e0000 R12: ffff888109515000 R13: 0000000000000000 R14: 0000000000000001 R15: 00000000000000401 FS: 0000000000000000(0000) 8822bf40000(0000) knlGS:0000000000000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f42ba70f030 CR3: 0000000109926000 CR4: 00000000000006e0 Seguimiento de llamadas: br_handle_vlan+0xbc/0xca [puente] _forward+0x23/0x164 [puente] delivery_clone+0x41/0x48 [puente] br_handle_frame_finish+0x36f/ 0x3aa [puente] ? skb_dst+0x2e/0x38 [puente]? br_handle_ingress_vlan_tunnel+0x3e/0x1c8 [puente]? br_handle_frame_finish+0x3aa/0x3aa [puente] br_handle_frame+0x2c3/0x377 [puente]? __skb_pull+0x33/0x51? vlan_do_receive+0x4f/0x36a? br_handle_frame_finish+0x3aa/0x3aa [puente] __netif_receive_skb_core+0x539/0x7c6? __list_del_entry_valid+0x16e/0x1c2 __netif_receive_skb_list_core+0x6d/0xd6 netif_receive_skb_list_internal+0x1d9/0x1fa gro_normal_list+0x22/0x3e dev_gro_receive+0x55b/0x600 ? detach_buf_split+0x58/0x140 napi_gro_receive+0x94/0x12e virtnet_poll+0x15d/0x315 [virtio_net] __napi_poll+0x2c/0x1c9 net_rx_action+0xe6/0x1fb __do_softirq+0x115/0x2d8 run_ksoftirq d+0x18/0x20 smpboot_thread_fn+0x183/0x19c ? smpboot_unregister_percpu_thread+0x66/0x66 kthread+0x10a/0x10f? kthread_mod_delayed_work+0xb6/0xb6 ret_from_fork+0x22/0x30 ---[ end trace 49f61b07f775fd2b ]--- dst_release: dst:00000000c02d677a refcnt:-1 dst_release underflow\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"4.14.238\",\"matchCriteriaId\":\"32B54D58-21AF-4B0B-B388-EADE824369F7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.196\",\"matchCriteriaId\":\"F3CAB837-7D38-4934-AD4F-195CEFD754E6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.128\",\"matchCriteriaId\":\"6267BD4E-BE25-48B5-B850-4B493440DAFA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.46\",\"matchCriteriaId\":\"59455D13-A902-42E1-97F7-5ED579777193\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.12.13\",\"matchCriteriaId\":\"7806E7E5-6D4F-4E18-81C1-79B3C60EE855\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"96AC23B2-D46A-49D9-8203-8E1BEDCA8532\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DA610E30-717C-4700-9F77-A3C9244F3BFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1ECD33F5-85BE-430B-8F86-8D7BD560311D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CF351855-2437-4CF5-AD7C-BDFA51F27683\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"25A855BA-2118-44F2-90EF-EBBB12AF51EF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/25053a8404ba17ca48f5553d487afc1882e9f56c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/42020f7f37a90d24b9551f5f7eba3f7c7c102968\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/79855be6445b6592bddb7bd7167083ec8cdbd73f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cfc579f9d89af4ada58c69b03bcaa4887840f3b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/25053a8404ba17ca48f5553d487afc1882e9f56c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/42020f7f37a90d24b9551f5f7eba3f7c7c102968\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/79855be6445b6592bddb7bd7167083ec8cdbd73f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cfc579f9d89af4ada58c69b03bcaa4887840f3b3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}"
  }
}