{"cve":"CVE-2022-48914","nvd":{"published":"2024-08-22T02:15:05.683","modified":"2026-06-17T05:16:36.027","status":"Analyzed","description":"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     <TASK>\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     </TASK>\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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/198cdc287769c717dafff5887c6125cb7a373bf3","https://git.kernel.org/stable/c/47e2f166ed9fe17f24561d6315be2228f6a90209","https://git.kernel.org/stable/c/a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8","https://git.kernel.org/stable/c/a63eb1e4a2e1a191a90217871e67fba42fd39255","https://git.kernel.org/stable/c/b40c912624775a21da32d1105e158db5f6d0554a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:54:16.205165117+00:00"},"epss":{"cve":"CVE-2022-48914","score":0.00215,"percentile":0.11933,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}