net: sched: cake: fix null pointer access issue when cake_init() fails

{
  "id": "13ca4cb36d3135c229d1199bf045621f6e037f3e3f35fe28e8efd99018d2f6d7",
  "url": "https://osv.dev/vulnerability/CVE-2022-50452",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: sched: cake: fix null pointer access issue when cake_init() fails",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: sched: cake: fix null pointer access issue when cake_init() fails When the default qdisc is cake, if the qdisc of dev_queue fails to be inited during mqprio_init(), cake_reset() is invoked to clear resources. In this case, the tins is NULL, and it will cause gpf issue. The process is as follows: qdisc_create_dflt() cake_init() q->tins = kvcalloc(...) --->failed, q->tins is NULL ... qdisc_put() ... cake_reset() ... cake_dequeue_one() b = &q->tins[...] --->q->tins is NULL The following is the Call Trace information: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:cake_dequeue_one+0xc9/0x3c0 Call Trace: cake_reset+0xb1/0x140 qdisc_reset+0xed/0x6f0 qdisc_destroy+0x82/0x4c0 qdisc_put+0x9e/0xb0 qdisc_create_dflt+0x2c3/0x4a0 mqprio_init+0xa71/0x1760 qdisc_create+0x3eb/0x1000 tc_modify_qdisc+0x408/0x1720 rtnetlink_rcv_msg+0x38e/0xac0 netlink_rcv_skb+0x12d/0x3a0 netlink_unicast+0x4a2/0x740 netlink_sendmsg+0x826/0xcc0 sock_sendmsg+0xc5/0x100 ____sys_sendmsg+0x583/0x690 ___sys_sendmsg+0xe8/0x160 __sys_sendmsg+0xbf/0x160 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f89e5122d04",
    "evidence": "osv:CVE-2022-50452",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.264",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.152",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.76",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50452",
      "aliases": [
        "CVE-2022-50452"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "046f6fd5daefac7f5abdafb436b30f63bc7c602b"
                },
                {
                  "fixed": "86aa1390898146f1de277bb6d2a8ed7fc7a43f12"
                },
                {
                  "fixed": "bc8301ea7e7f1bb9d2ba2fcdf7b5ec2f0792b47e"
                },
                {
                  "fixed": "ae48bee2830bf216800e1447baca39541e27a12e"
                },
                {
                  "fixed": "154f4c06d9dbec1a14e91286c70b6305810302e0"
                },
                {
                  "fixed": "1dc0a019550fd38ec6cab2d73c90df2bd659c96b"
                },
                {
                  "fixed": "51f9a8921ceacd7bf0d3f47fa867a64988ba1dcb"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50452.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.19.0"
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                {
                  "fixed": "4.19.264"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.152"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.76"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50452.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.318837551Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/154f4c06d9dbec1a14e91286c70b6305810302e0",
        "https://git.kernel.org/stable/c/1dc0a019550fd38ec6cab2d73c90df2bd659c96b",
        "https://git.kernel.org/stable/c/51f9a8921ceacd7bf0d3f47fa867a64988ba1dcb",
        "https://git.kernel.org/stable/c/86aa1390898146f1de277bb6d2a8ed7fc7a43f12",
        "https://git.kernel.org/stable/c/ae48bee2830bf216800e1447baca39541e27a12e",
        "https://git.kernel.org/stable/c/bc8301ea7e7f1bb9d2ba2fcdf7b5ec2f0792b47e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50452.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50452",
        "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/2022/50xxx/CVE-2022-50452.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50452",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496952,
  "published_at": "2025-10-01T11:45:25.394+00:00"
}