CVE-2021-47248 udp: fix race between close() and udp_abort()

2024-05-2114:19:45

Linux

github.com

vulnerability resolution

linux kernel

udp

race fix

udp_abort

close race

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.4%

JSON

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

udp: fix race between close() and udp_abort()

Kaustubh reported and diagnosed a panic in udp_lib_lookup().
The root cause is udp_abort() racing with close(). Both
racing functions acquire the socket lock, but udp{v6}_destroy_sock()
release it before performing destructive actions.

We can’t easily extend the socket lock scope to avoid the race,
instead use the SOCK_DEAD flag to prevent udp_abort from doing
any action when the critical race happens.

Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]>

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv4/udp.c",
      "net/ipv6/udp.c"
    ],
    "versions": [
      {
        "version": "5d77dca82839",
        "lessThan": "e3c36c773aed",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "a0882f68f54f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "2f73448041bd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "5a88477c1c85",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "8729ec8a2238",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "65310b0aff86",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5d77dca82839",
        "lessThan": "a8b897c7bcd4",
        "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/udp.c",
      "net/ipv6/udp.c"
    ],
    "versions": [
      {
        "version": "4.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.9",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.274",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.238",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.196",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.128",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.46",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.13",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]