CVE-2024-36903 ipv6: Fix potential uninit-value access in __ip6_make_skb()

2024-05-3015:29:04

Linux

github.com

linux kernel

vulnerability resolved

commit fc1092f51567

ipv4

flowi_flag_known_nh

hdrincl

race condition

6.8 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%

JSON

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

ipv6: Fix potential uninit-value access in __ip6_make_skb()

As it was done in commit fc1092f51567 (“ipv4: Fix uninit-value access in
__ip_make_skb()”) for IPv4, check FLOWI_FLAG_KNOWN_NH on fl6->flowi6_flags
instead of testing HDRINCL on the socket to avoid a race condition which
causes uninit-value access.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/ip6_output.c"
    ],
    "versions": [
      {
        "version": "ea30388baebc",
        "lessThan": "68c8ba16ab71",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ea30388baebc",
        "lessThan": "2367bf254f3a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ea30388baebc",
        "lessThan": "4e13d3a9c25b",
        "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/ip6_output.c"
    ],
    "versions": [
      {
        "version": "6.3",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.3",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.31",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.10",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]