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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-68397

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68397

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "net/iucv/af_iucv.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/iucv/af_iucv.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68397

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41717 · Revision 1
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Publisher date
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