CVE-2024-26910 netfilter: ipset: fix performance regression in swap operation

2024-04-1715:59:21

Linux

www.cve.org

linux kernel

netfilter

ipset

performance regression

swap operation

race condition

patch

synchronize_rcu

call_rcu

destroy function

garbage collectors

AI Score

5.9

Confidence

High

EPSS

Percentile

5.1%

JSON

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

netfilter: ipset: fix performance regression in swap operation

The patch “netfilter: ipset: fix race condition between swap/destroy
and kernel side add/del/test”, commit 28628fa9 fixes a race condition.
But the synchronize_rcu() added to the swap function unnecessarily slows
it down: it can safely be moved to destroy and use call_rcu() instead.

Eric Dumazet pointed out that simply calling the destroy functions as
rcu callback does not work: sets with timeout use garbage collectors
which need cancelling at destroy which can wait. Therefore the destroy
functions are split into two: cancelling garbage collectors safely at
executing the command received by netlink and moving the remaining
part only into the rcu callback.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "include/linux/netfilter/ipset/ip_set.h",
      "net/netfilter/ipset/ip_set_bitmap_gen.h",
      "net/netfilter/ipset/ip_set_core.c",
      "net/netfilter/ipset/ip_set_hash_gen.h",
      "net/netfilter/ipset/ip_set_list_set.c"
    ],
    "versions": [
      {
        "version": "427deb5ba566",
        "lessThan": "c7f2733e5011",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "e7152a138a5a",
        "lessThan": "a24d5f2ac8ef",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8bb930c3a1ea",
        "lessThan": "c2dc077d8f72",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "875ee3a09e27",
        "lessThan": "653bc5e6d999",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "23c31036f862",
        "lessThan": "b93a6756a01f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "28628fa952fe",
        "lessThan": "970709a67696",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "28628fa952fe",
        "lessThan": "97f7cf1cd80e",
        "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/linux/netfilter/ipset/ip_set.h",
      "net/netfilter/ipset/ip_set_bitmap_gen.h",
      "net/netfilter/ipset/ip_set_core.c",
      "net/netfilter/ipset/ip_set_hash_gen.h",
      "net/netfilter/ipset/ip_set_list_set.c"
    ],
    "versions": [
      {
        "version": "6.7",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.7",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.269",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.210",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.149",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.79",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.18",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.6",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]