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net/iucv: take a reference on the socket found in afiucv_hs_rcv()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: net/iucv: take a reference on the socket found in afiucv_hs_rcv() afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock, drops the lock, and then passes the socket to the afiucv_hs_callback_*() handlers without holding a reference. AF_IUCV sockets are not RCU-protected and are freed synchronously by iucv_sock_kill() -> sock_put(), so a concurrent close can free the socket in the window between read_unlock() and the handler, which then dereferences freed memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()). Take a reference with sock_hold() while the socket is still on the list and release it with sock_put() once the handler has run.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.265, 5.15.216, 6.1.183, 6.12.101, 6.18.42, 6.6.148, 7.1.6
CVEs
CVE-2026-68397
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 17:28 UTC · Revision 1

Source evidence

net/iucv: take a reference on the socket found in afiucv_hs_rcv()

core-osv · Original source

Published 10 Aug 2026, 12:04 UTC

In the Linux kernel, the following vulnerability has been resolved: net/iucv: take a reference on the socket found in afiucv_hs_rcv() afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock, drops the lock, and then passes the socket to the afiucv_hs_callback_*() handlers without holding a reference. AF_IUCV sockets are not RCU-protected and are freed synchronously by iucv_sock_kill() -> sock_put(), so a concurrent close can free the socket in the window between read_unlock() and the handler, which then dereferences freed memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()). Take a reference with sock_hold() while the socket is still on the list and release it with sock_put() once the handler has run.

osv:CVE-2026-68397

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6

Complete source record
{
  "id": "783870c17ed73638ec5e666c8c032d20d71085701a2cf897429d4d86eb6c1f5a",
  "url": "https://osv.dev/vulnerability/CVE-2026-68397",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/iucv: take a reference on the socket found in afiucv_hs_rcv()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/iucv: take a reference on the socket found in afiucv_hs_rcv() afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock, drops the lock, and then passes the socket to the afiucv_hs_callback_*() handlers without holding a reference. AF_IUCV sockets are not RCU-protected and are freed synchronously by iucv_sock_kill() -> sock_put(), so a concurrent close can free the socket in the window between read_unlock() and the handler, which then dereferences freed memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()). Take a reference with sock_hold() while the socket is still on the list and release it with sock_put() once the handler has run.",
    "evidence": "osv:CVE-2026-68397",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.183",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.148",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.101",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-68397",
      "aliases": [
        "CVE-2026-68397"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/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": "3881ac441f642d56503818123446f7298442236b"
                },
                {
                  "fixed": "5739be5c19495d709d902a2912c9102ce78740d5"
                },
                {
                  "fixed": "bc6c6e546ffff8865daaeb622ef348c2d481e80f"
                },
                {
                  "fixed": "e3e0679fc950191aff8f27fa78abcfc2462cff4a"
                },
                {
                  "fixed": "4dc0e63abf8bc7ba8892e617c1fb8b204361e022"
                },
                {
                  "fixed": "1801cb20a5025a787d6853e19c38db138344b4b4"
                },
                {
                  "fixed": "c75a950e77356e526672cba4584080c6c8b793b6"
                },
                {
                  "fixed": "5595ea59cdf29182cf6a270cacc1426c57b603de"
                },
                {
                  "fixed": "4fa349156043dc119721d067329714179f501749"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68397.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.2.0"
                },
                {
                  "fixed": "5.10.265"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.216"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.183"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.148"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.101"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68397.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.819199614Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4",
        "https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022",
        "https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749",
        "https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de",
        "https://git.kernel.org/stable/c/5739be5c19495d709d902a2912c9102ce78740d5",
        "https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f",
        "https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6",
        "https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68397.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68397",
        "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/2026/68xxx/CVE-2026-68397.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68397",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497841,
  "published_at": "2026-08-10T12:04:16.772+00:00"
}