CVE-2026-68476 (GCVE-0-2026-68476)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-09-02 12:49
VLAI
Title
ipvs: reload ip header after head reallocation
Summary
In the Linux kernel, the following vulnerability has been resolved: ipvs: reload ip header after head reallocation __ip_vs_get_out_rt() calls skb_ensure_writable() which may reallocate skb->head.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7 (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 657118cad620172dfd8f6ed5717fd75c0d1f7a5a (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < a10f5080afbed242640f2984328de25f84557da1 (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < ac6ac3d35bfc0ade9d17d354c84e503a946ebdab (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < e51687fc56c2e39ea6e9532925f1aabd4d529f61 (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 3fb7edd2018bb1ad0a68157383d9b9dac33dd645 (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < ad1e14710b360bda087ebf9fb82460eb5ef775de (git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < a2f57827bf7c695b8c72dc4511cae8e86582369d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 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)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
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              "version": "7.2",
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: reload ip header after head reallocation\n\n__ip_vs_get_out_rt() calls skb_ensure_writable() which may\nreallocate skb-\u003ehead."
        }
      ],
      "metrics": [
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            "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": [
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              "lang": "en",
              "value": "AV:N - The flaw is in ip_vs_bypass_xmit() on the IPVS netfilter receive path (NF_INET_LOCAL_IN/FORWARD); remote IPv4 packets to a configured virtual-server VIP reach ip_vs_in_hook() and ip_vs_leave() without local syscalls or ioctl.\nAC:L - Once cache_bypass is enabled on a fwmark IPVS service with no backend, an attacker can repeatedly send traffic to the VIP; cloned skbs (common with bridging, mirroring, or shared receive buffers) make skb_ensure_writable() reallocate skb-\u003ehead deterministically.\nPR:N - Exploitation requires only sending IP packets to the load balancer VIP; IPVS/cache_bypass configuration is an operator prerequisite on the target, not a Linux capability the remote attacker must hold.\nUI:N - No victim interaction is required; kernel processing of attacker-crafted network packets on the IPVS bypass transmit path alone triggers the stale header pointer use after skb head reallocation.\nS:U - Impact is kernel heap corruption and load-balancer compromise within the host kernel security domain; it does not cross VM, container, or IOMMU boundaries to another security authority.\nC:H - After pskb_expand_head() frees the old skb-\u003ehead, ip_send_check() uses the stale iph pointer and ip_fast_csum() reads attacker-influenced bytes from freed kmalloc memory, a classic use-after-free information disclosure primitive.\nI:H - ip_send_check() writes through the stale iph pointer (zeroing and updating the checksum field) into freed/reallocated slab memory, enabling heap corruption and potential arbitrary kernel write or control-flow hijack primitives.\nA:H - Writing and reading through a stale IP header pointer after skb head reallocation can corrupt adjacent kernel heap objects or dereference freed memory, causing kernel oops, panic, or hang and repeatable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T12:49:42.932Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/657118cad620172dfd8f6ed5717fd75c0d1f7a5a"
        },
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        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/a2f57827bf7c695b8c72dc4511cae8e86582369d"
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      "title": "ipvs: reload ip header after head reallocation",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68476",
    "datePublished": "2026-08-15T05:51:32.170Z",
    "dateReserved": "2026-07-30T09:28:09.396Z",
    "dateUpdated": "2026-09-02T12:49:42.932Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
      "epss": "0.00695",
      "percentile": "0.51127"
    },
    "nvd": {
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: reload ip header after head reallocation\n\n__ip_vs_get_out_rt() calls skb_ensure_writable() which may\nreallocate skb-\u003ehead."
          }
        ],
        "id": "CVE-2026-68476",
        "lastModified": "2026-09-02T13:18:04.373",
        "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"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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          },
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            "url": "https://git.kernel.org/stable/c/e51687fc56c2e39ea6e9532925f1aabd4d529f61"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:33:06Z",
      "cve": "CVE-2026-68476",
      "id": "CVE-2026-68476",
      "initial_release_date": "2026-09-07T16:23:58Z",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68476",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68476.json",
      "version": "4"
    }
  }
}



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