{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2022-48914", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "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->netdev->real_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's 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 <48> 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 \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 \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" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "35cad2003b64", "version_value": "198cdc287769" }, { "version_affected": "<", "version_name": "a5d8e6189b13", "version_value": "b40c91262477" }, { "version_affected": "<", "version_name": "443133330a5d", "version_value": "a1753d5c29a6" }, { "version_affected": "<", "version_name": "0abd3f9903fa", "version_value": "a63eb1e4a2e1" }, { "version_affected": "<", "version_name": "c5eb468cbc1f", "version_value": "47e2f166ed9f" }, { "version_affected": "<", "version_name": "d7dac083414e", "version_value": "dcf4ff7a48e7" }, { "version_affected": "<", "version_name": "4.19.226", "version_value": "4.19.233" }, { "version_affected": "<", "version_name": "5.4.174", "version_value": "5.4.183" }, { "version_affected": "<", "version_name": "5.10.94", "version_value": "5.10.104" }, { "version_affected": "<", "version_name": "5.15.17", "version_value": "5.15.27" }, { "version_affected": "<", "version_name": "5.16.3", "version_value": "5.16.13" } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3" }, { "url": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a" }, { "url": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8" }, { "url": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255" }, { "url": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209" }, { "url": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f" } ] }, "generator": { "engine": "bippy-c9c4e1df01b2" } }