{"id":"CVE-2022-49649","summary":"xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue\n\nxenvif_rx_next_skb() is expecting the rx queue not being empty, but\nin case the loop in xenvif_rx_action() is doing multiple iterations,\nthe availability of another skb in the rx queue is not being checked.\n\nThis can lead to crashes:\n\n[40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080\n[40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.537534] PGD 0 P4D 0\n[40072.537644] Oops: 0000 [#1] SMP NOPTI\n[40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5\n[40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021\n[40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000\n[40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback]\n[40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246\n[40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7\n[40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8\n[40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008\n[40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708\n[40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0\n[40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000\n[40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033\n[40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660\n[40072.539211] Call Trace:\n[40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback]\n[40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback]\n\nFix that by stopping the loop in case the rx queue becomes empty.","modified":"2026-04-02T08:27:48.189789Z","published":"2025-02-26T02:23:52.531Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1194-1","SUSE-SU-2025:1241-1","SUSE-SU-2025:1263-1","SUSE-SU-2025:1293-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49649.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49649.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49649"},{"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":"98f6d57ced73b723551568262019f1d6c8771f20"},{"fixed":"c0fcceb5f3f1ec197c014fe218c2f28108cacd27"},{"fixed":"d5320c6a27aa975aff740f9cb481dcbde48f4348"},{"fixed":"5a071aefd6414af5a20321ab58a0557b81993687"},{"fixed":"7425479d20f9e96f7c3ec8e8a93fe0d7478724cb"},{"fixed":"b9c32a6886af79d6e0ad87a7b01800ed079cdd02"},{"fixed":"b99174ac57fe5d8867448c03b23828e63f24cb1c"},{"fixed":"f0b5c819b062df8bf5f2acf4697e3871cb3722da"},{"fixed":"94e8100678889ab428e68acadf042de723f094b9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49649.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}