CVE-2024-41091 tun: add missing verification for short frame

2024-07-2906:18:12

Linux

www.cve.org

linux

kernel

vulnerability

EPSS

Percentile

13.5%

JSON

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

tun: add missing verification for short frame

The cited commit missed to check against the validity of the frame length
in the tun_xdp_one() path, which could cause a corrupted skb to be sent
downstack. Even before the skb is transmitted, the
tun_xdp_one–>eth_type_trans() may access the Ethernet header although it
can be less than ETH_HLEN. Once transmitted, this could either cause
out-of-bound access beyond the actual length, or confuse the underlayer
with incorrect or inconsistent header length in the skb metadata.

In the alternative path, tun_get_user() already prohibits short frame which
has the length less than Ethernet header size from being transmitted for
IFF_TAP.

This is to drop any frame shorter than the Ethernet header size just like
how tun_get_user() does.

CVE: CVE-2024-41091

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/tun.c"
    ],
    "versions": [
      {
        "version": "043d222f93ab",
        "lessThan": "32b0aaba5dbc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "6100e0237204",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "589382f50b4a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "ad6b3f622ccf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "d5ad89b7d01e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "a9d1c27e2ee3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "8418f55302fa",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "043d222f93ab",
        "lessThan": "049584807f1d",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/tun.c"
    ],
    "versions": [
      {
        "version": "4.20",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.20",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.281",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.223",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.164",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.102",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.43",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.12",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.2",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]