net/iucv: fix use after free in iucv_sock_close()

{
  "id": "fce56659340e01bc84cd5b8fc6996640148226d2a21d48a9c938c2144d57ca49",
  "url": "https://osv.dev/vulnerability/CVE-2024-42271",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/iucv: fix use after free in iucv_sock_close()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use after free in iucv_sock_close() iucv_sever_path() is called from process context and from bh context. iucv->path is used as indicator whether somebody else is taking care of severing the path (or it is already removed / never existed). This needs to be done with atomic compare and swap, otherwise there is a small window where iucv_sock_close() will try to work with a path that has already been severed and freed by iucv_callback_connrej() called by iucv_tasklet_fn(). Example: [452744.123844] Call Trace: [452744.123845] ([<0000001e87f03880>] 0x1e87f03880) [452744.123966] [<00000000d593001e>] iucv_path_sever+0x96/0x138 [452744.124330] [<000003ff801ddbca>] iucv_sever_path+0xc2/0xd0 [af_iucv] [452744.124336] [<000003ff801e01b6>] iucv_sock_close+0xa6/0x310 [af_iucv] [452744.124341] [<000003ff801e08cc>] iucv_sock_release+0x3c/0xd0 [af_iucv] [452744.124345] [<00000000d574794e>] __sock_release+0x5e/0xe8 [452744.124815] [<00000000d5747a0c>] sock_close+0x34/0x48 [452744.124820] [<00000000d5421642>] __fput+0xba/0x268 [452744.124826] [<00000000d51b382c>] task_work_run+0xbc/0xf0 [452744.124832] [<00000000d5145710>] do_notify_resume+0x88/0x90 [452744.124841] [<00000000d5978096>] system_call+0xe2/0x2c8 [452744.125319] Last Breaking-Event-Address: [452744.125321] [<00000000d5930018>] iucv_path_sever+0x90/0x138 [452744.125324] [452744.125325] Kernel panic - not syncing: Fatal exception in interrupt Note that ",
    "evidence": "osv:CVE-2024-42271",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.320",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.282",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.224",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.165",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.104",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.10.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-42271",
      "aliases": [
        "CVE-2024-42271"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7d316b9453523498246e9e19a659c423d4c5081e"
                },
                {
                  "fixed": "84f40b46787ecb67c7ad08a5bb1376141fa10c01"
                },
                {
                  "fixed": "37652fbef9809411cea55ea5fa1a170e299efcd0"
                },
                {
                  "fixed": "c65f72eec60a34ace031426e04e9aff8e5f04895"
                },
                {
                  "fixed": "ac758e1f663fe9bc64f6b47212a2aa18697524f5"
                },
                {
                  "fixed": "8b424c9e44111c5a76f41c6b741f8d4c4179d876"
                },
                {
                  "fixed": "01437282fd3904810603f3dc98d2cac6b8b6fc84"
                },
                {
                  "fixed": "69620522c48ce8215e5eb55ffbab8cafee8f407d"
                },
                {
                  "fixed": "f558120cd709682b739207b48cf7479fd9568431"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42271.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.4.0"
                },
                {
                  "fixed": "4.19.320"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.282"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.224"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
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                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.104"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42271.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.605492054Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/01437282fd3904810603f3dc98d2cac6b8b6fc84",
        "https://git.kernel.org/stable/c/37652fbef9809411cea55ea5fa1a170e299efcd0",
        "https://git.kernel.org/stable/c/69620522c48ce8215e5eb55ffbab8cafee8f407d",
        "https://git.kernel.org/stable/c/84f40b46787ecb67c7ad08a5bb1376141fa10c01",
        "https://git.kernel.org/stable/c/8b424c9e44111c5a76f41c6b741f8d4c4179d876",
        "https://git.kernel.org/stable/c/ac758e1f663fe9bc64f6b47212a2aa18697524f5",
        "https://git.kernel.org/stable/c/c65f72eec60a34ace031426e04e9aff8e5f04895",
        "https://git.kernel.org/stable/c/f558120cd709682b739207b48cf7479fd9568431",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42271.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-42271",
        "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/2024/42xxx/CVE-2024-42271.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-42271",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497446,
  "published_at": "2024-08-17T08:54:26.048+00:00"
}