CVE - CVE-2022-49649

CVE-ID
CVE-2022-49649	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue xenvif_rx_next_skb() is expecting the rx queue not being empty, but in case the loop in xenvif_rx_action() is doing multiple iterations, the availability of another skb in the rx queue is not being checked. This can lead to crashes: [40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.537534] PGD 0 P4D 0 [40072.537644] Oops: 0000 [#1] SMP NOPTI [40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5 [40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021 [40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000 [40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246 [40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7 [40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8 [40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008 [40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708 [40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0 [40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000 [40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660 [40072.539211] Call Trace: [40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback] [40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback] Fix that by stopping the loop in case the rx queue becomes empty.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687 URL:https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687 MISC:https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb URL:https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb MISC:https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9 URL:https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9 MISC:https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c URL:https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c MISC:https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02 URL:https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02 MISC:https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27 URL:https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27 MISC:https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348 URL:https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348 MISC:https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da URL:https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)