Vulnerability-Lookup

FKIE_CVE-2024-26631

Vulnerability from fkie_nvd - Published: 2024-03-18 11:15 - Updated: 2026-08-04 11:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work idev->mc_ifc_count can be written over without proper locking. Originally found by syzbot [1], fix this issue by encapsulating calls to mld_ifc_stop_work() (and mld_gq_stop_work() for good measure) with mutex_lock() and mutex_unlock() accordingly as these functions should only be called with mc_lock per their declarations. [1] BUG: KCSAN: data-race in ipv6_mc_down / mld_ifc_work write to 0xffff88813a80c832 of 1 bytes by task 3771 on cpu 0: mld_ifc_stop_work net/ipv6/mcast.c:1080 [inline] ipv6_mc_down+0x10a/0x280 net/ipv6/mcast.c:2725 addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949 addrconf_notify+0x310/0x980 notifier_call_chain kernel/notifier.c:93 [inline] raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461 __dev_notify_flags+0x205/0x3d0 dev_change_flags+0xab/0xd0 net/core/dev.c:8685 do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916 rtnl_group_changelink net/core/rtnetlink.c:3458 [inline] __rtnl_newlink net/core/rtnetlink.c:3717 [inline] rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910 ... write to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1: mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700 worker_thread+0x525/0x730 kernel/workqueue.c:2781 ...

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2e7ef287f07c74985f1bf2858bedc62bd9ebf155	Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/380540bb06bb1d1b12bdc947d1b8f56cda6b5663	Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3bb5849675ae1d592929798a2b37ea450879c855	Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3cc283fd16fba72e2cefe3a6f48d7a36b0438900	Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/62b3387beef11738eb6ce667601a28fa089fa02c	Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/75ddcd741d2a30696f5893bc71a9d28f4ef22311
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/2e7ef287f07c74985f1bf2858bedc62bd9ebf155	Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/380540bb06bb1d1b12bdc947d1b8f56cda6b5663	Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/3bb5849675ae1d592929798a2b37ea450879c855	Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/3cc283fd16fba72e2cefe3a6f48d7a36b0438900	Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/62b3387beef11738eb6ce667601a28fa089fa02c	Mailing List, Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "75ddcd741d2a30696f5893bc71a9d28f4ef22311",
              "status": "affected",
              "version": "07a7a183f22cf1e3ce5ed336fe62a6248a2f6738",
              "versionType": "git"
            },
            {
              "lessThan": "62b3387beef11738eb6ce667601a28fa089fa02c",
              "status": "affected",
              "version": "2d9a93b4902be6a5504b5941dd15e9cd776aadca",
              "versionType": "git"
            },
            {
              "lessThan": "380540bb06bb1d1b12bdc947d1b8f56cda6b5663",
              "status": "affected",
              "version": "2d9a93b4902be6a5504b5941dd15e9cd776aadca",
              "versionType": "git"
            },
            {
              "lessThan": "3cc283fd16fba72e2cefe3a6f48d7a36b0438900",
              "status": "affected",
              "version": "2d9a93b4902be6a5504b5941dd15e9cd776aadca",
              "versionType": "git"
            },
            {
              "lessThan": "3bb5849675ae1d592929798a2b37ea450879c855",
              "status": "affected",
              "version": "2d9a93b4902be6a5504b5941dd15e9cd776aadca",
              "versionType": "git"
            },
            {
              "lessThan": "2e7ef287f07c74985f1bf2858bedc62bd9ebf155",
              "status": "affected",
              "version": "2d9a93b4902be6a5504b5941dd15e9cd776aadca",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/mcast.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "204B38A4-3EB9-47E0-9F1D-0F4A2A97B347",
              "versionEndExcluding": "5.15.148",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "070D0ED3-90D0-4F95-B1FF-57D7F46F332D",
              "versionEndExcluding": "6.1.75",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5C6B50A6-3D8B-4CE2-BDCC-A098609CBA14",
              "versionEndExcluding": "6.6.14",
              "versionStartIncluding": "6.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7229C448-E0C9-488B-8939-36BA5254065E",
              "versionEndExcluding": "6.7.2",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work\n\nidev-\u003emc_ifc_count can be written over without proper locking.\n\nOriginally found by syzbot [1], fix this issue by encapsulating calls\nto mld_ifc_stop_work() (and mld_gq_stop_work() for good measure) with\nmutex_lock() and mutex_unlock() accordingly as these functions\nshould only be called with mc_lock per their declarations.\n\n[1]\nBUG: KCSAN: data-race in ipv6_mc_down / mld_ifc_work\n\nwrite to 0xffff88813a80c832 of 1 bytes by task 3771 on cpu 0:\n mld_ifc_stop_work net/ipv6/mcast.c:1080 [inline]\n ipv6_mc_down+0x10a/0x280 net/ipv6/mcast.c:2725\n addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949\n addrconf_notify+0x310/0x980\n notifier_call_chain kernel/notifier.c:93 [inline]\n raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461\n __dev_notify_flags+0x205/0x3d0\n dev_change_flags+0xab/0xd0 net/core/dev.c:8685\n do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916\n rtnl_group_changelink net/core/rtnetlink.c:3458 [inline]\n __rtnl_newlink net/core/rtnetlink.c:3717 [inline]\n rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754\n rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558\n netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545\n rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576\n netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]\n netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368\n netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910\n ...\n\nwrite to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1:\n mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653\n process_one_work kernel/workqueue.c:2627 [inline]\n process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700\n worker_thread+0x525/0x730 kernel/workqueue.c:2781\n ..."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ipv6: mcast: corrige data-race en ipv6_mc_down / mld_ifc_work idev-\u0026gt;mc_ifc_count se puede sobrescribir sin el bloqueo adecuado. Originalmente encontrado por syzbot [1], solucione este problema encapsulando las llamadas a mld_ifc_stop_work() (y mld_gq_stop_work() por si acaso) con mutex_lock() y mutex_unlock() en consecuencia, ya que estas funciones solo deben llamarse con mc_lock seg\u00fan sus declaraciones. [1] ERROR: KCSAN: carrera de datos en ipv6_mc_down / mld_ifc_work escribir en 0xffff88813a80c832 de 1 bytes por tarea 3771 en la CPU 0: mld_ifc_stop_work net/ipv6/mcast.c:1080 [en l\u00ednea] ipv6_mc_down+0x10a/0x280 net/ipv6/mcast .c:2725 addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949 addrconf_notify+0x310/0x980 notifier_call_chain kernel/notifier.c:93 [en l\u00ednea] raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461 __dev_notify_flag s+0x205/ 0x3d0 dev_change_flags+0xab/0xd0 net/core/dev.c:8685 do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916 rtnl_group_changelink net/core/rtnetlink.c:3458 [en l\u00ednea] __rtnl_newlink net/core/rtnetlink.c :3717 [en l\u00ednea] rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545 rtnetlink_rcv+0 x1c /0x20 net/core/rtnetlink.c:6576 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [en l\u00ednea] netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c :1910 ... escriba en 0xffff88813a80c832 de 1 bytes por tarea 22 en la CPU 1: mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653 Process_one_work kernel/workqueue.c:2627 [en l\u00ednea] Process_scheduled_works+0x5b8/0xa30 kernel/ workqueue.c:2700 trabajador_thread+0x525/0x730 kernel/workqueue.c:2781 ..."
    }
  ],
  "id": "CVE-2024-26631",
  "lastModified": "2026-08-04T11:16:50.947",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-26631",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-08-27T14:55:41.665799Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-03-18T11:15:09.483",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2e7ef287f07c74985f1bf2858bedc62bd9ebf155"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/380540bb06bb1d1b12bdc947d1b8f56cda6b5663"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3bb5849675ae1d592929798a2b37ea450879c855"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3cc283fd16fba72e2cefe3a6f48d7a36b0438900"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/62b3387beef11738eb6ce667601a28fa089fa02c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/75ddcd741d2a30696f5893bc71a9d28f4ef22311"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2e7ef287f07c74985f1bf2858bedc62bd9ebf155"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/380540bb06bb1d1b12bdc947d1b8f56cda6b5663"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3bb5849675ae1d592929798a2b37ea450879c855"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3cc283fd16fba72e2cefe3a6f48d7a36b0438900"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/62b3387beef11738eb6ce667601a28fa089fa02c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2024-26631 (GCVE-0-2024-26631)

Vulnerability from cvelistv5 – Published: 2024-03-18 10:07 – Updated: 2026-08-05 11:26

Title

ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-27 14:55 UTC

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/75ddcd741d2a30696…
https://git.kernel.org/stable/c/62b3387beef11738e…
https://git.kernel.org/stable/c/380540bb06bb1d1b1…
https://git.kernel.org/stable/c/3cc283fd16fba72e2…
https://git.kernel.org/stable/c/3bb5849675ae1d592…
https://git.kernel.org/stable/c/2e7ef287f07c74985…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 , < 75ddcd741d2a30696f5893bc71a9d28f4ef22311 (git) Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 62b3387beef11738eb6ce667601a28fa089fa02c (git) Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 380540bb06bb1d1b12bdc947d1b8f56cda6b5663 (git) Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 3cc283fd16fba72e2cefe3a6f48d7a36b0438900 (git) Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 3bb5849675ae1d592929798a2b37ea450879c855 (git) Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 2e7ef287f07c74985f1bf2858bedc62bd9ebf155 (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.148 , ≤ 5.15.* (semver) Unaffected: 6.1.75 , ≤ 6.1.* (semver) Unaffected: 6.6.14 , ≤ 6.6.* (semver) Unaffected: 6.7.2 , ≤ 6.7.* (semver) Unaffected: 6.8 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:07:19.693Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
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            "url": "https://git.kernel.org/stable/c/2e7ef287f07c74985f1bf2858bedc62bd9ebf155"
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        "title": "CVE Program Container"
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        "metrics": [
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              "content": {
                "id": "CVE-2024-26631",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2024-08-27T14:55:41.665799Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            {
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            {
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work\n\nidev-\u003emc_ifc_count can be written over without proper locking.\n\nOriginally found by syzbot [1], fix this issue by encapsulating calls\nto mld_ifc_stop_work() (and mld_gq_stop_work() for good measure) with\nmutex_lock() and mutex_unlock() accordingly as these functions\nshould only be called with mc_lock per their declarations.\n\n[1]\nBUG: KCSAN: data-race in ipv6_mc_down / mld_ifc_work\n\nwrite to 0xffff88813a80c832 of 1 bytes by task 3771 on cpu 0:\n mld_ifc_stop_work net/ipv6/mcast.c:1080 [inline]\n ipv6_mc_down+0x10a/0x280 net/ipv6/mcast.c:2725\n addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949\n addrconf_notify+0x310/0x980\n notifier_call_chain kernel/notifier.c:93 [inline]\n raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461\n __dev_notify_flags+0x205/0x3d0\n dev_change_flags+0xab/0xd0 net/core/dev.c:8685\n do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916\n rtnl_group_changelink net/core/rtnetlink.c:3458 [inline]\n __rtnl_newlink net/core/rtnetlink.c:3717 [inline]\n rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754\n rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558\n netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545\n rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576\n netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]\n netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368\n netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910\n ...\n\nwrite to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1:\n mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653\n process_one_work kernel/workqueue.c:2627 [inline]\n process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700\n worker_thread+0x525/0x730 kernel/workqueue.c:2781\n ..."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "lang": "en",
              "value": "AV:L - The `ipv6_mc_down()` side of the race is reached through local rtnetlink (`RTM_SETLINK`/`RTM_DELLINK` \u2192 `addrconf_notify`) and the opposing side through `setsockopt(IPV6_ADD_MEMBERSHIP)`, both local syscall interfaces. Although `mld_query_work` can additionally be fed by MLD query packets from a link-local peer, an adjacent attacker cannot initiate the interface-down half, so the self-contained attack is local.\nAC:L - The attacker drives both sides of the race deterministically and repeatedly: multicast join/leave and injected MLD queries queue `mc_ifc_work`/`mc_gq_work` while a concurrent thread loops `ip link set dev X down`, and `ipv6_mc_down()` uses non-sync `cancel_delayed_work()` for the query worker, guaranteeing an overlapping window on every iteration.\nPR:L - The rtnetlink gate is `netlink_net_capable(skb, CAP_NET_ADMIN)` \u2192 `netlink_ns_capable(..., sock_net(skb-\u003esk)-\u003euser_ns, ...)`, which an unprivileged user obtains in a fresh netns via `unshare -Urn`; the multicast-join side requires no privilege at all.\nUI:N - The attacker performs every step \u2014 creating the device, joining groups, injecting MLD queries, and toggling the link down \u2014 with no victim action required.\nS:U - The corruption is confined to kernel IPv6 multicast state and the `inet6_dev` object within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unserialized `cancel_delayed_work()`/`in6_dev_hold()` window permits an `idev-\u003erefcnt` underflow through `__in6_dev_put()`\u0027s unchecked `refcount_dec()`, leading to premature `kfree(idev)` while MLD workers still dereference it; a use-after-free on a kmalloc\u0027d `inet6_dev` gives the attacker reads of resprayed heap contents.\nI:H - The same use-after-free is a write primitive: `struct inet6_dev` embeds five `delayed_work` structures whose `work-\u003efunc` pointers the workqueue dispatches, plus `rs_timer` and `nd_parms`, so a resprayed object yields control-flow hijack; the race also corrupts adjacent packed fields (`mc_qrv`, `mc_gq_running`) that steer subsequent MLD state.\nA:H - The opposite interleaving orphans an `inet6_dev` reference so `in6_dev_finish_destroy()`/`netdev_put()` never run, wedging `unregister_netdevice: waiting for \u2026 to become free` permanently and blocking netns teardown under rtnl; the underflow direction produces `refcount_t` warnings and an oops."
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        "dateUpdated": "2026-08-05T11:26:24.727Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.