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tcp: call sk_data_ready() after listener migration

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tcp: call sk_data_ready() after listener migration When inet_csk_listen_stop() migrates an established child socket from a closing listener to another socket in the same SO_REUSEPORT group, the target listener gets a new accept-queue entry via inet_csk_reqsk_queue_add(), but that path never notifies the target listener's waiters. A nonblocking accept() still works because it checks the queue directly, but poll()/epoll_wait() waiters and blocking accept() callers can also remain asleep indefinitely. Call READ_ONCE(nsk->sk_data_ready)(nsk) after a successful migration in inet_csk_listen_stop(). However, after inet_csk_reqsk_queue_add() succeeds, the ref acquired in reuseport_migrate_sock() is effectively transferred to nreq->rsk_listener. Another CPU can then dequeue nreq via accept() or listener shutdown, hit reqsk_put(), and drop that listener ref. Since listeners are SOCK_RCU_FREE, wrap the post-queue_add() dereferences of nsk in rcu_read_lock()/rcu_read_unlock(), which also covers the existing sock_net(nsk) access in that path. The reqsk_timer_handler() path does not need the same changes for two reasons: half-open requests become readable only after the final ACK, where tcp_child_process() already wakes the listener; and once nreq is visible via inet_ehash_insert(), the success path no longer touches nsk directly.

Announced Group revision 1
Original source ↗

CVE-2026-46015

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-2026-46015

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": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "7aa7933a5607b1e5b56f322d17265c1d0ea02c51",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "14e9bb6eba8f59dcc637702e4744ae5e30660d76",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "ab5fdcd535645f6dbe6e9e21d96a08d141e88b4b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "bebd058ef40c67a81fe6d9ee8beaa4ede90e0704",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "83bb57635d7cbafde32f865b577ecfd969f02337",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "12625b4da84caf4d84a04988710a7b9bcf702b18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "54b92e84193749c9968aff2dd46e3b0f42643e18",
        "lessThan": "3864c6ba1e041bc75342353a70fa2a2c6f909923",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv4/inet_connection_sock.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv4/inet_connection_sock.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46015

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40105 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-46015 · Revision 1Source updated