CVE-2023-52581 netfilter: nf_tables: fix memleak when more than 255 elements expired

2024-03-0221:59:47

Linux

github.com

netfilter

nf_tables

vulnerability

memory leak

linux kernel

cve-2023-52581

gc container

elements expired

AI Score

6.7

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

netfilter: nf_tables: fix memleak when more than 255 elements expired

When more than 255 elements expired we’re supposed to switch to a new gc
container structure.

This never happens: u8 type will wrap before reaching the boundary
and nft_trans_gc_space() always returns true.

This means we recycle the initial gc container structure and
lose track of the elements that came before.

While at it, don’t deref ‘gc’ after we’ve passed it to call_rcu.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8da1b048f9a5",
        "lessThan": "7cf055b43756",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bbdb3b65aa91",
        "lessThan": "a995a68e8a3b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "448be0774882",
        "lessThan": "09c85f2d21ab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d19e8bf3ea41",
        "lessThan": "ef99506eaf1d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ea3eb9f2192e",
        "lessThan": "7e5d732e6902",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f68718b34a5",
        "lessThan": "4aea243b6853",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5f68718b34a5",
        "lessThan": "cf5000a7787c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_tables.h",
      "net/netfilter/nf_tables_api.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.5",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "6.5.6",
        "versionType": "custom",
        "lessThanOrEqual": "6.5.*"
      },
      {
        "status": "unaffected",
        "version": "6.6",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/netfilter/nf_tables.h",
      "net/netfilter/nf_tables_api.c"
    ],
    "defaultStatus": "affected"
  }
]