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net/iucv: fix locking in .getsockopt

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.

Announced Source revision 1
Original source ↗

CVE-2026-64004

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-2026-64004

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": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "884eb247b74d86db97e3a37f0d6fc8e1e83590dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "45bb8de8c95d8899f4b8f61bd9bceb8132af73cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "1fc30bd4e55e2dd622d2d366cecd732c1841bbee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "cd691beafea0dd779e69e81ccc26b0ab50efcb5e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "6e792b8dd3002bbc4136745928a9605df1a72b8a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "9817369243380e287ebe5525411557eaa3aa2a79",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "69554adc7a6fa04ede3ad7512321d83748e3c920",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "51363b8751a673a00ad48eea895266396d53fa52",
        "lessThan": "3589d20a666caf30ad100c960a2de7de390fce88",
        "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": "3.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/iucv/af_iucv.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64004

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40929 · Revision 1
Added to Heist Feed
Publisher date
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