CVE-2024-27431 cpumap: Zero-initialise xdp_rxq_info struct before running XDP program

2024-05-1712:02:10

Linux

www.cve.org

cve-2024-27431

linux kernel

xdp program

cpumap

vulnerability

xdp_rxq_info

rx_queue_index

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.4%

JSON

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

cpumap: Zero-initialise xdp_rxq_info struct before running XDP program

When running an XDP program that is attached to a cpumap entry, we don’t
initialise the xdp_rxq_info data structure being used in the xdp_buff
that backs the XDP program invocation. Tobias noticed that this leads to
random values being returned as the xdp_md->rx_queue_index value for XDP
programs running in a cpumap.

This means we’re basically returning the contents of the uninitialised
memory, which is bad. Fix this by zero-initialising the rxq data
structure before running the XDP program.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/bpf/cpumap.c"
    ],
    "versions": [
      {
        "version": "9216477449f3",
        "lessThan": "5f4e51abfbe6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9216477449f3",
        "lessThan": "f0363af9619c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9216477449f3",
        "lessThan": "3420b3ff1ff4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9216477449f3",
        "lessThan": "f562e4c4aab0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9216477449f3",
        "lessThan": "eaa7cb836659",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9216477449f3",
        "lessThan": "2487007aa3b9",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/bpf/cpumap.c"
    ],
    "versions": [
      {
        "version": "5.9",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.9",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.213",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.152",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.82",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.22",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.10",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]