CVE-2024-41007 tcp: avoid too many retransmit packets

2024-07-1508:48:10

Linux

www.cve.org

linux kernel

tcp vulnerability

fix

retransmit packets

EPSS

Percentile

13.4%

JSON

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

tcp: avoid too many retransmit packets

If a TCP socket is using TCP_USER_TIMEOUT, and the other peer
retracted its window to zero, tcp_retransmit_timer() can
retransmit a packet every two jiffies (2 ms for HZ=1000),
for about 4 minutes after TCP_USER_TIMEOUT has ‘expired’.

The fix is to make sure tcp_rtx_probe0_timed_out() takes
icsk->icsk_user_timeout into account.

Before blamed commit, the socket would not timeout after
icsk->icsk_user_timeout, but would use standard exponential
backoff for the retransmits.

Also worth noting that before commit e89688e3e978 (“net: tcp:
fix unexcepted socket die when snd_wnd is 0”), the issue
would last 2 minutes instead of 4.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv4/tcp_timer.c"
    ],
    "versions": [
      {
        "version": "b701a99e431d",
        "lessThan": "7bb7670f92bf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "d2346fca5bed",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "5d7e64d70a11",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "04317a2471c2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "e113cddefa27",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "dfcdd7f89e40",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "66cb64a1d223",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b701a99e431d",
        "lessThan": "97a9063518f1",
        "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/ipv4/tcp_timer.c"
    ],
    "versions": [
      {
        "version": "4.19",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.19",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.318",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.280",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.222",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.163",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.100",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.41",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.10",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]