xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue

{
  "id": "baba4b6e19a60460569f735899225bda29453cec57e92df438b9be637f588d92",
  "url": "https://osv.dev/vulnerability/CVE-2022-49649",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue",
    "summary": "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: ",
    "evidence": "osv:CVE-2022-49649",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.9.324",
            "evidence": "/affected/1/ranges"
          },
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            "value": "4.14.289",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "value": "5.18.13",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2022-49649",
      "aliases": [
        "CVE-2022-49649"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "d5320c6a27aa975aff740f9cb481dcbde48f4348"
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                {
                  "fixed": "5a071aefd6414af5a20321ab58a0557b81993687"
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                {
                  "fixed": "7425479d20f9e96f7c3ec8e8a93fe0d7478724cb"
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                {
                  "fixed": "b9c32a6886af79d6e0ad87a7b01800ed079cdd02"
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                {
                  "fixed": "b99174ac57fe5d8867448c03b23828e63f24cb1c"
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                {
                  "fixed": "f0b5c819b062df8bf5f2acf4697e3871cb3722da"
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                {
                  "fixed": "94e8100678889ab428e68acadf042de723f094b9"
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              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49649.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "4.9.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49649.json"
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      ],
      "modified": "2026-10-28T02:30:20.898438231Z",
      "provider": "osv",
      "references": [
        "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",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49649.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49649",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49649.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49649",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487004,
  "published_at": "2025-02-26T02:23:52.531+00:00"
}