CVE-2024-27390 ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

2024-05-0113:05:12

Linux

www.cve.org

linux kernel

vulnerability

ipv6

mcast

synchronize_net() barrier

igmp6_event_query()

igmp6_event_report()

kasan

AI Score

6.7

Confidence

Low

EPSS

Percentile

10.3%

JSON

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

ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

As discussed in the past (commit 2d3916f31891 (“ipv6: fix skb drops
in igmp6_event_query() and igmp6_event_report()”)) I think the
synchronize_net() call in ipv6_mc_down() is not needed.

Under load, synchronize_net() can last between 200 usec and 5 ms.

KASAN seems to agree as well.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/mcast.c"
    ],
    "versions": [
      {
        "version": "f185de28d9ae",
        "lessThan": "9d159d6637cc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f185de28d9ae",
        "lessThan": "a03ede2282eb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f185de28d9ae",
        "lessThan": "26d4bac55750",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f185de28d9ae",
        "lessThan": "7eb06ee59211",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f185de28d9ae",
        "lessThan": "5da9a218340a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f185de28d9ae",
        "lessThan": "17ef8efc00b3",
        "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/ipv6/mcast.c"
    ],
    "versions": [
      {
        "version": "5.13",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.13",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.153",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.83",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.23",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.11",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.2",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]