CVE-2026-68338 (GCVE-0-2026-68338)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:33
VLAI
Title
net/packet: avoid fanout hook re-registration after unregister
Summary
In the Linux kernel, the following vulnerability has been resolved: net/packet: avoid fanout hook re-registration after unregister packet_set_ring() temporarily detaches a socket from packet delivery while reconfiguring its ring. It records the previous running state, clears po->num, unregisters the protocol hook when needed, drops po->bind_lock, and later restores po->num and re-registers the hook from the saved was_running value. That unlocked window can race with NETDEV_UNREGISTER. The notifier can observe the socket as not running, skip __unregister_prot_hook(), and invalidate the per-socket binding by setting po->ifindex to -1 and clearing po->prot_hook.dev. A one-member fanout group can still retain its shared fanout hook device pointer. When packet_set_ring() resumes, re-registering solely from the stale was_running state can re-add the fanout hook after the device has been unregistered. Treat po->ifindex == -1 as an invalidated binding after reacquiring po->bind_lock. This is distinct from ifindex 0, the normal unbound/wildcard state: ifindex -1 marks an existing device binding that was invalidated when the device was unregistered. Restore po->num as before, but do not re-register the hook if device unregister already detached the socket.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < acb40ebfa5c4d62f84339fcbf713f2a9fd033a71 (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < c820f4b7f2fa38f8769db0d0cefdd94e2721504d (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < 4628efbdc7affd094181f5263e65c1062e31f15f (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < 80ec024d53a05c60ad1d08968dcf745f10c1665c (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < 0a052e0808e015e68144a9877e6ef42b952c49fa (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < 1bc55c29cd85818e9052f17deb287d5a11fb817f (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < a885387dae7986a55bae5c77a15bdd447f64e9b9 (git)
Affected: dc99f600698dcac69b8f56dda9a8a00d645c5ffc , < 50aff80475abd3533eef4320477037e6fcc6b56e (git)
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Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: avoid fanout hook re-registration after unregister\n\npacket_set_ring() temporarily detaches a socket from packet delivery while\nreconfiguring its ring. It records the previous running state, clears\npo-\u003enum, unregisters the protocol hook when needed, drops po-\u003ebind_lock,\nand later restores po-\u003enum and re-registers the hook from the saved\nwas_running value.\n\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\nobserve the socket as not running, skip __unregister_prot_hook(), and\ninvalidate the per-socket binding by setting po-\u003eifindex to -1 and clearing\npo-\u003eprot_hook.dev. A one-member fanout group can still retain its shared\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\nsolely from the stale was_running state can re-add the fanout hook after\nthe device has been unregistered.\n\nTreat po-\u003eifindex == -1 as an invalidated binding after reacquiring\npo-\u003ebind_lock. This is distinct from ifindex 0, the normal\nunbound/wildcard state: ifindex -1 marks an existing device binding that\nwas invalidated when the device was unregistered. Restore po-\u003enum as\nbefore, but do not re-register the hook if device unregister already\ndetached the socket."
        }
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            "version": "3.1"
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              "value": "AV:L - The bug is triggered through local syscalls \u2014 creating an AF_PACKET socket, PACKET_FANOUT/bind setsockopt, PACKET_RX_RING setsockopt, and a netlink device unregister \u2014 with no remote packet processing involved.\nAC:L - The attacker controls both sides of the race: it issues the packet_set_ring() reconfiguration and deletes the bound netdev in its own netns, and the unlocked window spans synchronize_net() plus the ring swap, making it wide and reliably winnable.\nPR:L - AF_PACKET requires CAP_NET_RAW and device unregistration CAP_NET_ADMIN, but an unprivileged user obtains both via user+network namespaces (unshare -Urn) and can create and delete veth/dummy devices there.\nUI:N - The attacker performs every step itself \u2014 socket setup, ring reconfiguration and device teardown \u2014 with no action required from any other user.\nS:U - The stale hook registration and resulting corruption stay within the kernel\u0027s own security authority; no hypervisor, IOMMU or other trust boundary is crossed.\nC:H - The fanout packet_type is left linked into a net_device that is being torn down, a dangling registration on soon-to-be-freed memory; such stale-pointer state in the ptype lists can be leveraged for kernel memory disclosure.\nI:H - The dangling list node in the freed net_device\u0027s ptype list yields a list_del write into freed memory when the hook is later removed, a controllable write primitive typical of use-after-free exploitation.\nA:H - The re-added hook makes netdev_run_todo() hit BUG_ON(!list_empty(\u0026dev-\u003eptype_all)) while RTNL is held, oopsing the kernel and permanently wedging all further network configuration \u2014 a repeatable, unprivileged host-wide denial of service."
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      "title": "net/packet: avoid fanout hook re-registration after unregister",
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    "datePublished": "2026-08-10T12:03:14.549Z",
    "dateReserved": "2026-07-30T09:28:09.384Z",
    "dateUpdated": "2026-08-19T16:33:38.308Z",
    "state": "PUBLISHED"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: avoid fanout hook re-registration after unregister\n\npacket_set_ring() temporarily detaches a socket from packet delivery while\nreconfiguring its ring. It records the previous running state, clears\npo-\u003enum, unregisters the protocol hook when needed, drops po-\u003ebind_lock,\nand later restores po-\u003enum and re-registers the hook from the saved\nwas_running value.\n\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\nobserve the socket as not running, skip __unregister_prot_hook(), and\ninvalidate the per-socket binding by setting po-\u003eifindex to -1 and clearing\npo-\u003eprot_hook.dev. A one-member fanout group can still retain its shared\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\nsolely from the stale was_running state can re-add the fanout hook after\nthe device has been unregistered.\n\nTreat po-\u003eifindex == -1 as an invalidated binding after reacquiring\npo-\u003ebind_lock. This is distinct from ifindex 0, the normal\nunbound/wildcard state: ifindex -1 marks an existing device binding that\nwas invalidated when the device was unregistered. Restore po-\u003enum as\nbefore, but do not re-register the hook if device unregister already\ndetached the socket."
          }
        ],
        "id": "CVE-2026-68338",
        "lastModified": "2026-08-19T17:20:43.790",
        "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"
            }
          ]
        },
        "published": "2026-08-10T13:20:24.230",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c820f4b7f2fa38f8769db0d0cefdd94e2721504d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T11:10:41+00:00",
      "cve": "CVE-2026-68338",
      "id": "CVE-2026-68338",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/packet: avoid fanout hook re-registration after unregister",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68338.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-23T00:20:17Z",
      "cve": "CVE-2026-68338",
      "id": "CVE-2026-68338",
      "initial_release_date": "2026-08-11T23:47:20Z",
      "product_status:first_fixed": "68",
      "product_status:known_affected": "710",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "23",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68338",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68338.json",
      "version": "7"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.