CVE-2024-27395 net: openvswitch: Fix Use-After-Free in ovs_ct_exit

2024-05-0916:37:15

Linux

www.cve.org

linux kernel

net

openvswitch

use-after-free

ovs_ct_exit

vulnerability

9.4 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.1%

JSON

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

net: openvswitch: Fix Use-After-Free in ovs_ct_exit

Since kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal
of ovs_ct_limit_exit, is not part of the RCU read critical section, it
is possible that the RCU grace period will pass during the traversal and
the key will be free.

To prevent this, it should be changed to hlist_for_each_entry_safe.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/openvswitch/conntrack.c"
    ],
    "versions": [
      {
        "version": "11efd5cb04a1",
        "lessThan": "2db9a8c0a01f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "589523cf0b38",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "35880c3fa6f8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "9048616553c6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "bca6fa2d9a9f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "eaa5e164a211",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "edee0758747d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "11efd5cb04a1",
        "lessThan": "5ea7b72d4fac",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/openvswitch/conntrack.c"
    ],
    "versions": [
      {
        "version": "4.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.18",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.313",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.275",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.216",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.158",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.90",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.30",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.9",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]