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tipc: prevent snt_unacked underflow on CONN_ACK

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked underflow on CONN_ACK tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages actually outstanding: tsk->snt_unacked -= msg_conn_ack(hdr); msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK message. If the ack count is larger than snt_unacked, the subtraction wraps to a near-maximum value, leaving tsk_conn_cong() permanently true and starving the connection of further transmits. Validate the ACK count at the start of the CONN_ACK block and drop the message if it acknowledges more messages than are outstanding. A peer (or, for a local connection, the connected peer socket) can otherwise wedge a TIPC connection's send side by sending an oversized connection ack.

Announced Source revision 1
Original source ↗

CVE-2026-74282

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-2026-74282

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": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "3388145d258cf2c4c98278e3987296007d30672e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "67e55b054bf8025658dc0e255057f2a6236416bd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "96f91b8ae1a489b3eca137e7acf42cf985fb8939",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "47ed873e4ceda34098bd46d8e96b4bb13cad3a04",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "b44bebdd32c9ff66ee2aebfc317ced44bedd9335",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "3cfa3d8e0dc167850edeb5bf5a07757db83fd54e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "1e2c956745777e6ffdee7f30da5935741c03ee1e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10724cc7bb7832b482df049c20fd824d928c5eaa",
        "lessThan": "ab3e10b44ba5411779aac7afd2477917dd77750f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/tipc/socket.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/tipc/socket.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74282

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33081 · Revision 1
Added to Heist Feed
Publisher date
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