{"id":"CVE-2022-50073","summary":"net: tap: NULL pointer derefence in dev_parse_header_protocol when skb-\u003edev is null","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tap: NULL pointer derefence in dev_parse_header_protocol when skb-\u003edev is null\n\nFixes a NULL pointer derefence bug triggered from tap driver.\nWhen tap_get_user calls virtio_net_hdr_to_skb the skb-\u003edev is null\n(in tap.c skb-\u003edev is set after the call to virtio_net_hdr_to_skb)\nvirtio_net_hdr_to_skb calls dev_parse_header_protocol which\nneeds skb-\u003edev field to be valid.\n\nThe line that trigers the bug is in dev_parse_header_protocol\n(dev is at offset 0x10 from skb and is stored in RAX register)\n  if (!dev-\u003eheader_ops || !dev-\u003eheader_ops-\u003eparse_protocol)\n  22e1:   mov    0x10(%rbx),%rax\n  22e5:\t  mov    0x230(%rax),%rax\n\nSetting skb-\u003edev before the call in tap.c fixes the issue.\n\nBUG: kernel NULL pointer dereference, address: 0000000000000230\nRIP: 0010:virtio_net_hdr_to_skb.constprop.0+0x335/0x410 [tap]\nCode: c0 0f 85 b7 fd ff ff eb d4 41 39 c6 77 cf 29 c6 48 89 df 44 01 f6 e8 7a 79 83 c1 48 85 c0 0f 85 d9 fd ff ff eb b7 48 8b 43 10 \u003c48\u003e 8b 80 30 02 00 00 48 85 c0 74 55 48 8b 40 28 48 85 c0 74 4c 48\nRSP: 0018:ffffc90005c27c38 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: ffff888298f25300 RCX: 0000000000000010\nRDX: 0000000000000005 RSI: ffffc90005c27cb6 RDI: ffff888298f25300\nRBP: ffffc90005c27c80 R08: 00000000ffffffea R09: 00000000000007e8\nR10: ffff88858ec77458 R11: 0000000000000000 R12: 0000000000000001\nR13: 0000000000000014 R14: ffffc90005c27e08 R15: ffffc90005c27cb6\nFS:  0000000000000000(0000) GS:ffff88858ec40000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000230 CR3: 0000000281408006 CR4: 00000000003706e0\nCall Trace:\n tap_get_user+0x3f1/0x540 [tap]\n tap_sendmsg+0x56/0x362 [tap]\n ? get_tx_bufs+0xc2/0x1e0 [vhost_net]\n handle_tx_copy+0x114/0x670 [vhost_net]\n handle_tx+0xb0/0xe0 [vhost_net]\n handle_tx_kick+0x15/0x20 [vhost_net]\n vhost_worker+0x7b/0xc0 [vhost]\n ? vhost_vring_call_reset+0x40/0x40 [vhost]\n kthread+0xfa/0x120\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x1f/0x30","modified":"2026-04-03T13:14:24.120263Z","published":"2025-06-18T11:02:17.468Z","related":["SUSE-SU-2025:02264-1","SUSE-SU-2025:02321-1","SUSE-SU-2025:02322-1","SUSE-SU-2025:02334-1","SUSE-SU-2025:02537-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50073.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4f61f133f354853bc394ec7d6028adb9b02dd701"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dd29648fcf69339713f2d25f7014ae905dcdfc18"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50073.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50073"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"924a9bc362a5223cd448ca08c3dde21235adc310"},{"fixed":"dd29648fcf69339713f2d25f7014ae905dcdfc18"},{"fixed":"4f61f133f354853bc394ec7d6028adb9b02dd701"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d"},{"last_affected":"54ef8243c3c8e90f1ea5792e6752e021a25c8eb3"},{"last_affected":"ca278267d6cd9544645731732455b6b20cb0e895"},{"last_affected":"faa3baa2828c5e1c4374f3e60041f75c64f5fcb6"},{"last_affected":"99b1d3f74b9ef72c2f74c8e4c078e1bc0706e748"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50073.json"}}],"schema_version":"1.7.5"}