cve-2022-48914
Vulnerability from cvelistv5
Published
2024-08-22 01:32
Modified
2024-12-19 08:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xen/netfront: destroy queues before real_num_tx_queues is zeroed xennet_destroy_queues() relies on info->netdev->real_num_tx_queues to delete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 ("net-sysfs: update the queue counts in the unregistration path"), unregister_netdev() indirectly sets real_num_tx_queues to 0. Those two facts together means, that xennet_destroy_queues() called from xennet_remove() cannot do its job, because it's called after unregister_netdev(). This results in kfree-ing queues that are still linked in napi, which ultimately crashes: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 52 Comm: xenwatch Tainted: G W 5.16.10-1.32.fc32.qubes.x86_64+ #226 RIP: 0010:free_netdev+0xa3/0x1a0 Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00 RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050 R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680 FS: 0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0 Call Trace: <TASK> xennet_remove+0x13d/0x300 [xen_netfront] xenbus_dev_remove+0x6d/0xf0 __device_release_driver+0x17a/0x240 device_release_driver+0x24/0x30 bus_remove_device+0xd8/0x140 device_del+0x18b/0x410 ? _raw_spin_unlock+0x16/0x30 ? klist_iter_exit+0x14/0x20 ? xenbus_dev_request_and_reply+0x80/0x80 device_unregister+0x13/0x60 xenbus_dev_changed+0x18e/0x1f0 xenwatch_thread+0xc0/0x1a0 ? do_wait_intr_irq+0xa0/0xa0 kthread+0x16b/0x190 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30 </TASK> Fix this by calling xennet_destroy_queues() from xennet_uninit(), when real_num_tx_queues is still available. This ensures that queues are destroyed when real_num_tx_queues is set to 0, regardless of how unregister_netdev() was called. Originally reported at https://github.com/QubesOS/qubes-issues/issues/7257
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 35cad2003b6447932cfe91f795090586306738e8
Version: a5d8e6189b134f5db61be5cd59cf5a74bb01edc7
Version: 443133330a5d4a3fd429179d460cc297724fefe8
Version: 0abd3f9903fae6ecf8db3c89a459971fe7925499
Version: c5eb468cbc1fa663bf0cc6c5360802dea4e611c2
Version: d7dac083414eb5bb99a6d2ed53dc2c1b405224e5
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   Linux Linux Version: 4.19.226   ≤
Version: 5.4.174   ≤
Version: 5.10.94   ≤
Version: 5.15.17   ≤
Version: 5.16.3   ≤
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48914",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:33:50.755135Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:11.621Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/xen-netfront.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/xen-netfront.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "4.19.233",
              "status": "affected",
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\n\nxennet_destroy_queues() relies on info-\u003enetdev-\u003ereal_num_tx_queues to\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\n(\"net-sysfs: update the queue counts in the unregistration path\"),\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\nfacts together means, that xennet_destroy_queues() called from\nxennet_remove() cannot do its job, because it\u0027s called after\nunregister_netdev(). This results in kfree-ing queues that are still\nlinked in napi, which ultimately crashes:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000000\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    PGD 0 P4D 0\n    Oops: 0000 [#1] PREEMPT SMP PTI\n    CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64+ #226\n    RIP: 0010:free_netdev+0xa3/0x1a0\n    Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff \u003c48\u003e 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\n    RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\n    RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\n    RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\n    RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\n    R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\n    R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\n    FS:  0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\n    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n    CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\n    Call Trace:\n     \u003cTASK\u003e\n     xennet_remove+0x13d/0x300 [xen_netfront]\n     xenbus_dev_remove+0x6d/0xf0\n     __device_release_driver+0x17a/0x240\n     device_release_driver+0x24/0x30\n     bus_remove_device+0xd8/0x140\n     device_del+0x18b/0x410\n     ? _raw_spin_unlock+0x16/0x30\n     ? klist_iter_exit+0x14/0x20\n     ? xenbus_dev_request_and_reply+0x80/0x80\n     device_unregister+0x13/0x60\n     xenbus_dev_changed+0x18e/0x1f0\n     xenwatch_thread+0xc0/0x1a0\n     ? do_wait_intr_irq+0xa0/0xa0\n     kthread+0x16b/0x190\n     ? set_kthread_struct+0x40/0x40\n     ret_from_fork+0x22/0x30\n     \u003c/TASK\u003e\n\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\nwhen real_num_tx_queues is still available. This ensures that queues are\ndestroyed when real_num_tx_queues is set to 0, regardless of how\nunregister_netdev() was called.\n\nOriginally reported at\nhttps://github.com/QubesOS/qubes-issues/issues/7257"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T08:10:24.338Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3"
        },
        {
          "url": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8"
        },
        {
          "url": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255"
        },
        {
          "url": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f"
        }
      ],
      "title": "xen/netfront: destroy queues before real_num_tx_queues is zeroed",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48914",
    "datePublished": "2024-08-22T01:32:07.803Z",
    "dateReserved": "2024-08-21T06:06:23.294Z",
    "dateUpdated": "2024-12-19T08:10:24.338Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48914\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-22T02:15:05.683\",\"lastModified\":\"2024-09-12T13:27:34.623\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\\n\\nxennet_destroy_queues() relies on info-\u003enetdev-\u003ereal_num_tx_queues to\\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\\n(\\\"net-sysfs: update the queue counts in the unregistration path\\\"),\\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\\nfacts together means, that xennet_destroy_queues() called from\\nxennet_remove() cannot do its job, because it\u0027s called after\\nunregister_netdev(). This results in kfree-ing queues that are still\\nlinked in napi, which ultimately crashes:\\n\\n    BUG: kernel NULL pointer dereference, address: 0000000000000000\\n    #PF: supervisor read access in kernel mode\\n    #PF: error_code(0x0000) - not-present page\\n    PGD 0 P4D 0\\n    Oops: 0000 [#1] PREEMPT SMP PTI\\n    CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64+ #226\\n    RIP: 0010:free_netdev+0xa3/0x1a0\\n    Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff \u003c48\u003e 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\\n    RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\\n    RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\\n    RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\\n    RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\\n    R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\\n    R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\\n    FS:  0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\\n    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n    CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\\n    Call Trace:\\n     \u003cTASK\u003e\\n     xennet_remove+0x13d/0x300 [xen_netfront]\\n     xenbus_dev_remove+0x6d/0xf0\\n     __device_release_driver+0x17a/0x240\\n     device_release_driver+0x24/0x30\\n     bus_remove_device+0xd8/0x140\\n     device_del+0x18b/0x410\\n     ? _raw_spin_unlock+0x16/0x30\\n     ? klist_iter_exit+0x14/0x20\\n     ? xenbus_dev_request_and_reply+0x80/0x80\\n     device_unregister+0x13/0x60\\n     xenbus_dev_changed+0x18e/0x1f0\\n     xenwatch_thread+0xc0/0x1a0\\n     ? do_wait_intr_irq+0xa0/0xa0\\n     kthread+0x16b/0x190\\n     ? set_kthread_struct+0x40/0x40\\n     ret_from_fork+0x22/0x30\\n     \u003c/TASK\u003e\\n\\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\\nwhen real_num_tx_queues is still available. This ensures that queues are\\ndestroyed when real_num_tx_queues is set to 0, regardless of how\\nunregister_netdev() was called.\\n\\nOriginally reported at\\nhttps://github.com/QubesOS/qubes-issues/issues/7257\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen/netfront: destruye colas antes de que real_num_tx_queues se ponga a cero xennet_destroy_queues() se basa en info-\u0026gt;netdev-\u0026gt;real_num_tx_queues para eliminar colas. Dado que d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 (\\\"net-sysfs: actualice los recuentos de colas en la ruta de cancelaci\u00f3n de registro\\\"), unregister_netdev() establece indirectamente real_num_tx_queues en 0. Esos dos hechos juntos significan que xennet_destroy_queues() llamado desde xennet_remove() no puede hacer su trabajo, porque s llamado despu\u00e9s de unregister_netdev(). Esto da como resultado colas kfree-ing que todav\u00eda est\u00e1n vinculadas en napi, lo que finalmente falla: ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - PGD de p\u00e1gina no presente 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 52 Comm: xenwatch Tainted: GW 5.16.10-1.32.fc32.qubes.x86_64+ #226 RIP: 0010:free_netdev+0xa3/0x1a0 C\u00f3digo: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff \u0026lt;48\u0026gt; 8b 85 60 01 00 0 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00 RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000 RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff RBP: fffffffffffffea0 R08: 00000000000000000 R09: 00000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050 R13: ffff8880065f8f88 R14: 00000000000000000 R15: ffff8880066c6680 FS: 00000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: CR3: 00000000e998c006 CR4: 00000000003706e0 Seguimiento de llamadas:  xennet_remove+0x13d/0x300 [xen_netfront] xenbus_dev_remove+0x6d/0xf0 __device_release_driver+0x17a/0x240 device_release_driver+0x24/ 0x30 bus_remove_device+0xd8/0x140 dispositivo_del+0x18b/0x410? _raw_spin_unlock+0x16/0x30? klist_iter_exit+0x14/0x20? xenbus_dev_request_and_reply+0x80/0x80 dispositivo_unregister+0x13/0x60 xenbus_dev_changed+0x18e/0x1f0 xenwatch_thread+0xc0/0x1a0 ? do_wait_intr_irq+0xa0/0xa0 kthread+0x16b/0x190 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30  Solucione este problema llamando a xennet_destroy_queues() desde xennet_uninit(), cuando real_num_tx_queues todav\u00eda est\u00e9 disponible. Esto garantiza que las colas se destruyan cuando real_num_tx_queues se establece en 0, independientemente de c\u00f3mo se llam\u00f3 a unregister_netdev(). Reportado originalmente en https://github.com/QubesOS/qubes-issues/issues/7257\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.226\",\"versionEndExcluding\":\"4.19.233\",\"matchCriteriaId\":\"844F8286-579D-45F3-91F9-B0963A45C46A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.174\",\"versionEndExcluding\":\"5.4.183\",\"matchCriteriaId\":\"50DC6A9D-EDB7-4237-9253-6A36CB2A79E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.94\",\"versionEndExcluding\":\"5.10.104\",\"matchCriteriaId\":\"07144469-6081-4ABC-AD38-F23A8D9B3E86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.17\",\"versionEndExcluding\":\"5.15.27\",\"matchCriteriaId\":\"A3C6A607-7094-4C3C-B703-C6B5A1F87670\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.3\",\"versionEndExcluding\":\"5.16.13\",\"matchCriteriaId\":\"CA1CE57C-E9AE-4BFC-8E39-AECD1A63C9A0\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48914\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:33:50.755135Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:15.841Z\"}}], \"cna\": {\"title\": \"xen/netfront: destroy queues before real_num_tx_queues is zeroed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"35cad2003b6447932cfe91f795090586306738e8\", \"lessThan\": \"198cdc287769c717dafff5887c6125cb7a373bf3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a5d8e6189b134f5db61be5cd59cf5a74bb01edc7\", \"lessThan\": \"b40c912624775a21da32d1105e158db5f6d0554a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"443133330a5d4a3fd429179d460cc297724fefe8\", \"lessThan\": \"a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0abd3f9903fae6ecf8db3c89a459971fe7925499\", \"lessThan\": \"a63eb1e4a2e1a191a90217871e67fba42fd39255\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c5eb468cbc1fa663bf0cc6c5360802dea4e611c2\", \"lessThan\": \"47e2f166ed9fe17f24561d6315be2228f6a90209\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\", \"lessThan\": \"dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/xen-netfront.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.19.226\", \"lessThan\": \"4.19.233\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.174\", \"lessThan\": \"5.4.183\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.10.94\", \"lessThan\": \"5.10.104\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.17\", \"lessThan\": \"5.15.27\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.16.3\", \"lessThan\": \"5.16.13\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/net/xen-netfront.c\"], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3\"}, {\"url\": \"https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a\"}, {\"url\": \"https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8\"}, {\"url\": \"https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255\"}, {\"url\": \"https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209\"}, {\"url\": \"https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxen/netfront: destroy queues before real_num_tx_queues is zeroed\\n\\nxennet_destroy_queues() relies on info-\u003enetdev-\u003ereal_num_tx_queues to\\ndelete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5\\n(\\\"net-sysfs: update the queue counts in the unregistration path\\\"),\\nunregister_netdev() indirectly sets real_num_tx_queues to 0. Those two\\nfacts together means, that xennet_destroy_queues() called from\\nxennet_remove() cannot do its job, because it\u0027s called after\\nunregister_netdev(). This results in kfree-ing queues that are still\\nlinked in napi, which ultimately crashes:\\n\\n    BUG: kernel NULL pointer dereference, address: 0000000000000000\\n    #PF: supervisor read access in kernel mode\\n    #PF: error_code(0x0000) - not-present page\\n    PGD 0 P4D 0\\n    Oops: 0000 [#1] PREEMPT SMP PTI\\n    CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64+ #226\\n    RIP: 0010:free_netdev+0xa3/0x1a0\\n    Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39 c4 75 26 eb 47 e8 ed c1 66 ff \u003c48\u003e 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00\\n    RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286\\n    RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000\\n    RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff\\n    RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000\\n    R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050\\n    R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680\\n    FS:  0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000\\n    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n    CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0\\n    Call Trace:\\n     \u003cTASK\u003e\\n     xennet_remove+0x13d/0x300 [xen_netfront]\\n     xenbus_dev_remove+0x6d/0xf0\\n     __device_release_driver+0x17a/0x240\\n     device_release_driver+0x24/0x30\\n     bus_remove_device+0xd8/0x140\\n     device_del+0x18b/0x410\\n     ? _raw_spin_unlock+0x16/0x30\\n     ? klist_iter_exit+0x14/0x20\\n     ? xenbus_dev_request_and_reply+0x80/0x80\\n     device_unregister+0x13/0x60\\n     xenbus_dev_changed+0x18e/0x1f0\\n     xenwatch_thread+0xc0/0x1a0\\n     ? do_wait_intr_irq+0xa0/0xa0\\n     kthread+0x16b/0x190\\n     ? set_kthread_struct+0x40/0x40\\n     ret_from_fork+0x22/0x30\\n     \u003c/TASK\u003e\\n\\nFix this by calling xennet_destroy_queues() from xennet_uninit(),\\nwhen real_num_tx_queues is still available. This ensures that queues are\\ndestroyed when real_num_tx_queues is set to 0, regardless of how\\nunregister_netdev() was called.\\n\\nOriginally reported at\\nhttps://github.com/QubesOS/qubes-issues/issues/7257\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:10:24.338Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48914\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:10:24.338Z\", \"dateReserved\": \"2024-08-21T06:06:23.294Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-22T01:32:07.803Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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