CVE-2022-49649
Estado: ModificadaMedia (5.5)—
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:
Fix that by stopping the loop in case the rx queue becomes empty.
Detalles técnicos trazas, registros y código del informe original
[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]
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.27%
- Percentil entre todas las CVEs puntuadas: 17
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
- CWE-476
Referencias
- https://git.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687
- https://git.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cb
- https://git.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9
- https://git.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1c
- https://git.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02
- https://git.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27
- https://git.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348
- https://git.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da
JSON original (NVD)
Mostrar
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"value": "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."
},
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"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xen/netback: evitar ingresar a xenvif_rx_next_skb() con una cola rx vacía xenvif_rx_next_skb() espera que la cola rx no esté vacía, pero en caso de que el bucle en xenvif_rx_action() esté realizando múltiples iteraciones, no se verifica la disponibilidad de otro skb en la cola rx. Esto puede provocar fallos: [40072.537261] ERROR: no se puede gestionar la desreferencia del puntero NULL del núcleo en 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] Solucione esto deteniendo el bucle en caso de que la cola de recepción se vacíe."
}
],
"lastModified": "2026-06-17T05:18:44.933",
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