← Back to CVE Explorer

CVE-2026-68397

Full vulnerability record from the local CVENow database.

Description

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.

Severity
HIGH
CVSS score
8.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-10 13:20:33.127000
Last modified
2026-10-19 22:17:17.067000
View original CVE JSON 
{
  "id": "CVE-2026-68397",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-10T13:20:33.127",
  "lastModified": "2026-10-19T22:17:17.067",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/iucv: take a reference on the socket found in afiucv_hs_rcv()\n\nafiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,\ndrops the lock, and then passes the socket to the afiucv_hs_callback_*()\nhandlers without holding a reference. AF_IUCV sockets are not\nRCU-protected and are freed synchronously by iucv_sock_kill() ->\nsock_put(), so a concurrent close can free the socket in the window\nbetween read_unlock() and the handler, which then dereferences freed\nmemory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).\n\nTake a reference with sock_hold() while the socket is still on the list\nand release it with sock_put() once the handler has run."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/iucv/af_iucv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "5739be5c19495d709d902a2912c9102ce78740d5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "bc6c6e546ffff8865daaeb622ef348c2d481e80f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "e3e0679fc950191aff8f27fa78abcfc2462cff4a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "4dc0e63abf8bc7ba8892e617c1fb8b204361e022",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "1801cb20a5025a787d6853e19c38db138344b4b4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "c75a950e77356e526672cba4584080c6c8b793b6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "5595ea59cdf29182cf6a270cacc1426c57b603de",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "3881ac441f642d56503818123446f7298442236b",
              "lessThan": "4fa349156043dc119721d067329714179f501749",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/iucv/af_iucv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.2",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.2",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.265",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.216",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.183",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.148",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.101",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.42",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.6",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T15:48:06.325018Z",
          "id": "CVE-2026-68397",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1801cb20a5025a787d6853e19c38db138344b4b4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4dc0e63abf8bc7ba8892e617c1fb8b204361e022",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4fa349156043dc119721d067329714179f501749",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5595ea59cdf29182cf6a270cacc1426c57b603de",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5739be5c19495d709d902a2912c9102ce78740d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bc6c6e546ffff8865daaeb622ef348c2d481e80f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c75a950e77356e526672cba4584080c6c8b793b6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e3e0679fc950191aff8f27fa78abcfc2462cff4a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}