CVE-2024-35898 netfilter: nf_tables: Fix potential data-race in __nft_flowtable_type_get()

2024-05-1908:34:52

Linux

github.com

linux kernel

data-race

netfilter

nf_tables

vulnerability

fix

potential data-race

AI Score

6.8

Confidence

Low

EPSS

Percentile

13.0%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

netfilter: nf_tables: Fix potential data-race in __nft_flowtable_type_get()

nft_unregister_flowtable_type() within nf_flow_inet_module_exit() can
concurrent with __nft_flowtable_type_get() within nf_tables_newflowtable().
And thhere is not any protection when iterate over nf_tables_flowtables
list in __nft_flowtable_type_get(). Therefore, there is pertential
data-race of nf_tables_flowtables list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_flowtables list
in __nft_flowtable_type_get(), and use rcu_read_lock() in the caller
nft_flowtable_type_get() to protect the entire type query process.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "69d1fe14a680",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "a347bc8e6251",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "940d41caa71f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "2485bcfe05ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "9b5b7708ec2b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "8b891153b2e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "e684b1674fd1",
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      },
      {
        "status": "affected",
        "version": "3b49e2e94e6e",
        "lessThan": "24225011d81b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "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": "4.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.16",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.19.312",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.274",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.154",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.85",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.26",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.5",
        "versionType": "custom",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_tables_api.c"
    ],
    "defaultStatus": "affected"
  }
]