CVE-2024-40931 mptcp: ensure snd_una is properly initialized on connect

2024-07-1212:25:09

Linux

www.cve.org

linux kernel

vulnerability

mptcp

EPSS

Percentile

10.6%

JSON

In the Linux kernel, the following vulnerability has been resolved:

mptcp: ensure snd_una is properly initialized on connect

This is strictly related to commit fb7a0d334894 (“mptcp: ensure snd_nxt
is properly initialized on connect”). It turns out that syzkaller can
trigger the retransmit after fallback and before processing any other
incoming packet - so that snd_una is still left uninitialized.

Address the issue explicitly initializing snd_una together with snd_nxt
and write_seq.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mptcp/protocol.c"
    ],
    "versions": [
      {
        "version": "8fd738049ac3",
        "lessThan": "208cd22ef5e5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8fd738049ac3",
        "lessThan": "7b9c7fc8600b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8fd738049ac3",
        "lessThan": "f03c46eabb3a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8fd738049ac3",
        "lessThan": "f1f0a46f8bb8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8fd738049ac3",
        "lessThan": "ef473bf1dd7e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8fd738049ac3",
        "lessThan": "8031b58c3a9b",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mptcp/protocol.c"
    ],
    "versions": [
      {
        "version": "5.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.9",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.221",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.162",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.95",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.35",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.6",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]