CVE-2021-46991 i40e: Fix use-after-free in i40e_client_subtask()

2024-02-2808:13:17

Linux

github.com

linux kernel

i40e

use-after-free

vulnerability

fix

object

access

return

pointer

free

cve-2021-46991

coverity

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

10.4%

JSON

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

i40e: Fix use-after-free in i40e_client_subtask()

Currently the call to i40e_client_del_instance frees the object
pf->cinst, however pf->cinst->lan_info is being accessed after
the free. Fix this by adding the missing return.

Addresses-Coverity: (“Read from pointer after free”)

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/intel/i40e/i40e_client.c"
    ],
    "versions": [
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "c1322eaeb8af",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "d718c15a2bf9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "829a713450b8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "4ebc10aa7cd1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "1fd5d262e744",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b0b1a6d0ac9",
        "lessThan": "38318f23a7ef",
        "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/intel/i40e/i40e_client.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"
      }
    ]
  }
]