CVE-2024-26856 net: sparx5: Fix use after free inside sparx5_del_mact_entry

2024-04-1710:17:18

Linux

github.com

linux kernel

vulnerability resolved

use after free

sparx5

sparx5_del_mact_entry

static analysis

code

mac table

fix

devm_kfree

vid

delete entry

AI Score

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

net: sparx5: Fix use after free inside sparx5_del_mact_entry

Based on the static analyzis of the code it looks like when an entry
from the MAC table was removed, the entry was still used after being
freed. More precise the vid of the mac_entry was used after calling
devm_kfree on the mac_entry.
The fix consists in first using the vid of the mac_entry to delete the
entry from the HW and after that to free it.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b37a1bae742f",
        "lessThan": "e46274df1100",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b37a1bae742f",
        "lessThan": "0de693d68b0a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b37a1bae742f",
        "lessThan": "e83bebb718fd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b37a1bae742f",
        "lessThan": "71809805b950",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b37a1bae742f",
        "lessThan": "89d72d4125e9",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.15.152",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.82",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.22",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.10",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microchip/sparx5/sparx5_mactable.c"
    ],
    "defaultStatus": "affected"
  }
]