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net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated.

Announced Source revision 1
Original source ↗

CVE-2026-68141

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-2026-68141

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": "6a1eb5b46c19073f8153b7e2c19b408cf353aaf1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "07e21deb3664001995e0a456dd627ab7dbe127ec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "8bb111f87ded6acb9837ec9b45d6f02cda94c51f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "46453b16f38ec7147351f7447e2aec6ea330f7b3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "33736ff5e7c97d3348ce812e8bd2e125d840743c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "0e857185591fe79934427c9c0c1c31dc776be134",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "47a5116e56a6b6fe1e909f244e39cd0fc26ceee4",
        "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-2026-68141

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41132 · Revision 1
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Publisher date
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