CVE-2021-46998 ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

2024-02-2808:13:21

Linux

www.cve.org

linux kernel

vulnerability

ethernet

enic

use after free

bug fix

skb

govind

AI Score

7.6

Confidence

High

EPSS

Percentile

10.3%

JSON

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

ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside
enic_queue_wq_skb, if some error happens, the skb will be freed
by dev_kfree_skb(skb). But the freed skb is still used in
skb_tx_timestamp(skb).

My patch makes enic_queue_wq_skb() return error and goto spin_unlock()
incase of error. The solution is provided by Govind.
See https://lkml.org/lkml/2021/4/30/961.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/cisco/enic/enic_main.c"
    ],
    "versions": [
      {
        "version": "fb7516d42478",
        "lessThan": "25a87b1f566b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fb7516d42478",
        "lessThan": "f7f6f0777409",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fb7516d42478",
        "lessThan": "7afdd6aba95c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fb7516d42478",
        "lessThan": "6892396ebf04",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fb7516d42478",
        "lessThan": "d90529392aaf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fb7516d42478",
        "lessThan": "643001b47adc",
        "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/ethernet/cisco/enic/enic_main.c"
    ],
    "versions": [
      {
        "version": "4.16",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.16",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.191",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.120",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.38",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.11.22",
        "lessThanOrEqual": "5.11.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.5",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]