{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-48914","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-08-21T06:06:23.294Z","datePublished":"2024-08-22T01:32:07.803Z","dateUpdated":"2025-05-04T08:26:00.352Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T08:26:00.352Z"},"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->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"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netfront.c"],"versions":[{"version":"35cad2003b6447932cfe91f795090586306738e8","lessThan":"198cdc287769c717dafff5887c6125cb7a373bf3","status":"affected","versionType":"git"},{"version":"a5d8e6189b134f5db61be5cd59cf5a74bb01edc7","lessThan":"b40c912624775a21da32d1105e158db5f6d0554a","status":"affected","versionType":"git"},{"version":"443133330a5d4a3fd429179d460cc297724fefe8","lessThan":"a1753d5c29a6fb9a8966dcf04cb4f3b71e303ae8","status":"affected","versionType":"git"},{"version":"0abd3f9903fae6ecf8db3c89a459971fe7925499","lessThan":"a63eb1e4a2e1a191a90217871e67fba42fd39255","status":"affected","versionType":"git"},{"version":"c5eb468cbc1fa663bf0cc6c5360802dea4e611c2","lessThan":"47e2f166ed9fe17f24561d6315be2228f6a90209","status":"affected","versionType":"git"},{"version":"d7dac083414eb5bb99a6d2ed53dc2c1b405224e5","lessThan":"dcf4ff7a48e7598e6b10126cc02177abb8ae4f3f","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/xen-netfront.c"],"versions":[{"version":"4.19.226","lessThan":"4.19.233","status":"affected","versionType":"semver"},{"version":"5.4.174","lessThan":"5.4.183","status":"affected","versionType":"semver"},{"version":"5.10.94","lessThan":"5.10.104","status":"affected","versionType":"semver"},{"version":"5.15.17","lessThan":"5.15.27","status":"affected","versionType":"semver"},{"version":"5.16.3","lessThan":"5.16.13","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.226","versionEndExcluding":"4.19.233"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.174","versionEndExcluding":"5.4.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.94","versionEndExcluding":"5.10.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.17","versionEndExcluding":"5.15.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16.3","versionEndExcluding":"5.16.13"}]}]}],"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-1.2.0"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-12T17:33:11.621Z"}}]}}