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net/iucv: filter frames in afiucv_hs_rcv() by ingress device

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/iucv: filter frames in afiucv_hs_rcv() by ingress device afiucv_hs_rcv() selects a socket from iucv_sk_list by matching four 8-byte name fields in the transport header alone. No check is made against the net_device the frame arrived on. This can cause a frame arriving on any netdev to be delivered to an AF_IUCV socket. Three problems follow. First, a frame arriving over HiperSockets can be delivered to a socket bound to the classic z/VM IUCV transport, which has iucv->hs_dev == NULL. iucv_sock_bind() takes the classic path whenever the requested userid matches iucv_userid, even on a guest that also has a HiperSockets device carrying the same identifier. The child socket created by afiucv_hs_callback_syn() for such a match inherits hs_dev = NULL and transport = AF_IUCV_TRANS_HIPER, so the first send() on it returns -ENODEV. The socket delivered to accept() is unusable. Second, a frame arriving on one netdev can be delivered to a socket bound to a different IQD device. Which can lead to - Accept-queue exhaustion (DoS) - Attacker-controlled peer identity in the child socket - Data injection into existing sockets - Fabric noise on the IQD fabric, where bogus replies are sent - killing established connections Third, all AF_IUCV sockets live in init_net, as iucv_sock_alloc() calls sk_alloc(&init_net, ...). But even frames arriving on netdev devices in a namespace can be delivered to an IUCV socket. So a process

Announced Source revision 1
Original source ↗

CVE-2026-81003

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-2026-81003

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": "639828ad4d374056167391dbaffd13dd5e5e5ddb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "92e5c281f1caa287bb58292f2687c9e3ff3aa23e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "712330f8a4293cfd97b0d62b7c7dc01862a16b98",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "0a5af67e7184c6a0e155c317840bd64b37177af4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "dfac2936b83be00035ae176f8252e1c1e1de9207",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "8e3763f1ccac3fc395f9af2b87114c023ced8a3f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "a7f0130a091724e69827ab58e74777a88747e892",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3881ac441f642d56503818123446f7298442236b",
        "lessThan": "80230a18c164a4b5bbc048fe2768b219ac17bc5a",
        "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": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/iucv/af_iucv.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-81003

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34957 · Revision 1
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Publisher date
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