Vulnerability-Lookup

FKIE_CVE-2026-74398

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-10-16 20:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "47b05836705b63dab93d9ac7c69a3a507375ef80",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "d21be7d051012c6b572fa4e3334443c250216f7b",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "875c284c0f98b042bb97abad460f63a24c977f88",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "8ed0ce9ea58d677d1bac92614ee5f60f8ea57363",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "b61af0268e3d1308c466bf0be5dced844eafc1ef",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "e889aa99ad3ed48bb0ddcff6475b17542532d18b",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "627ac78f2741e2ebd2225e2e953b6964a8a9182f",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "835b474b8f70fa68d68abffad37378e92f661802",
              "versionType": "git"
            },
            {
              "lessThan": "3.11",
              "status": "affected",
              "version": "3.10.105",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp-\u003estate from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp-\u003elock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp-\u003estate\nto DEAD and run list_del_rcu(\u0026ifp-\u003eif_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp-\u003elock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp-\u003elock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."
    }
  ],
  "id": "CVE-2026-74398",
  "lastModified": "2026-10-16T20:17:25.390",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-74398",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T18:55:29.102774Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-15T06:22:41.790",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74398 (GCVE-0-2026-74398)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-10-16 19:05

Title

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 18:55 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6992 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/47b05836705b63dab…
https://git.kernel.org/stable/c/d21be7d051012c6b5…
https://git.kernel.org/stable/c/875c284c0f98b042b…
https://git.kernel.org/stable/c/8ed0ce9ea58d677d1…
https://git.kernel.org/stable/c/3bdc86d89fd6c6523…
https://git.kernel.org/stable/c/b61af0268e3d1308c…
https://git.kernel.org/stable/c/e889aa99ad3ed48bb…
https://git.kernel.org/stable/c/627ac78f2741e2ebd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 47b05836705b63dab93d9ac7c69a3a507375ef80 (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < d21be7d051012c6b572fa4e3334443c250216f7b (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 875c284c0f98b042bb97abad460f63a24c977f88 (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < b61af0268e3d1308c466bf0be5dced844eafc1ef (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < e889aa99ad3ed48bb0ddcff6475b17542532d18b (git) Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 627ac78f2741e2ebd2225e2e953b6964a8a9182f (git) Affected: 835b474b8f70fa68d68abffad37378e92f661802 (git) Affected: 3.10.105 , < 3.11 (semver)
Linux	Linux	Affected: 3.14 Unaffected: 0 , < 3.14 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-74398",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T18:55:29.102774Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-16T19:05:41.331Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "47b05836705b63dab93d9ac7c69a3a507375ef80",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "d21be7d051012c6b572fa4e3334443c250216f7b",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "875c284c0f98b042bb97abad460f63a24c977f88",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "8ed0ce9ea58d677d1bac92614ee5f60f8ea57363",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "b61af0268e3d1308c466bf0be5dced844eafc1ef",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "e889aa99ad3ed48bb0ddcff6475b17542532d18b",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "lessThan": "627ac78f2741e2ebd2225e2e953b6964a8a9182f",
              "status": "affected",
              "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "835b474b8f70fa68d68abffad37378e92f661802",
              "versionType": "git"
            },
            {
              "lessThan": "3.11",
              "status": "affected",
              "version": "3.10.105",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.10.105",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp-\u003estate from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp-\u003elock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp-\u003estate\nto DEAD and run list_del_rcu(\u0026ifp-\u003eif_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp-\u003elock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp-\u003elock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is reached from inbound ICMPv6 Neighbor Discovery (NS/NA) packets processed by icmp6_rcv()\u2192ndisc_rcv()\u2192addrconf_dad_failure(), the standard IPv6 network receive path on internet-facing servers, cloud VMs, phones, and IoT devices on shared L2 segments.\nAC:L - An attacker controls both sides of the race by flooding forged NS/NA during DAD while concurrently triggering ipv6_del_addr() via RTM_DELADDR/CAP_NET_ADMIN in a user namespace, CNI/orchestration address teardown, or interface-down processing; retries make the narrow window reliably winnable.\nPR:N - Triggering DAD failure requires only unauthenticated ND packet injection on the victim\u0027s link; the concurrent ipv6_del_addr() leg needs no victim credentials and can come from automatic address lifecycle events (CNI churn, SLAAC/privacy regeneration, netdev down) rather than attacker admin rights.\nUI:N - Exploitation does not require any victim user action such as opening files or mounting filesystems; it targets automatic IPv6 address configuration and DAD processing that occurs during normal network connectivity and boot.\nS:U - The corrupted inet6_ifaddr lifecycle and resulting kernel crash occur within kernel memory management; impact does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The race leaves a freed/partially torn-down inet6_ifaddr with corrupted state and a poisoned RCU list entry (LIST_POISON2), constituting use-after-free class memory corruption that can expose adjacent kernel heap contents beyond a pure crash.\nI:H - Corrupting inet6_ifaddr state after list_del_rcu() and re-queuing dad_work on a dead object enables heap reuse and control of freed object contents, providing a path to arbitrary kernel memory writes and potential code execution beyond denial of service.\nA:H - The demonstrated failure is a general protection fault in ipv6_del_addr() from addrconf_dad_work on the ipv6_addrconf workqueue, causing a kernel oops/panic and complete loss of system availability on affected hosts."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:43.132Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"
        },
        {
          "url": "https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"
        },
        {
          "url": "https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"
        }
      ],
      "title": "ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74398",
    "datePublished": "2026-08-15T05:59:10.113Z",
    "dateReserved": "2026-08-15T05:44:03.891Z",
    "dateUpdated": "2026-10-16T19:05:41.331Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

Vulnerability timeline

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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.
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