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

2024-03-0221:59:47

Linux

www.cve.org

linux kernel

netfilter

nf_tables

memleak fix

elements expired

gc container

AI Score

8.6

Confidence

High

EPSS

Percentile

10.3%

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

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