CVE-2026-68477 (GCVE-0-2026-68477)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
ipvs: fix more places with wrong ipv6 transport offsets
Summary
In the Linux kernel, the following vulnerability has been resolved: ipvs: fix more places with wrong ipv6 transport offsets Sashiko reports for more incorrect IPv6 transport offsets. The app code for TCP was assuming IPv4 network header even after the ipvsh argument was provided. This can cause problems with apps over IPv6. As for the only official app in the kernel tree (FTP) this problem is harmless because we use Netfilter to mangle the FTP ports and we do not adjust the TCP seq numbers. Also, provide correct offset of the ICMPV6 header in ip_vs_out_icmp_v6() for correct checksum checks when the IPv6 packet has extension headers.
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: 2a3b791e6e1169f374224d164738e9f7be703d77 , < 613ce63711b8d431bba90781f133c39a21684f87 (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < 95d4511d81b2b37e5d2bdde5d912e48243eae517 (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < 3a9dc9b55b53d94613a587604b77d3b20024090c (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < a3f0d5b605cd5da5c95279969fb8cea4e55cee5b (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < 7350eb7ead172ae8024897d4b0f2e15c5318279c (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < d4ec18f48ce78a3bf7c999ac908691007375fe99 (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < 905d7a363ade96a19f214815361e11981142c547 (git)
Affected: 2a3b791e6e1169f374224d164738e9f7be703d77 , < b3fe4cbd583895987935a9bdad01c8f9d3a02310 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (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)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix more places with wrong ipv6 transport offsets\n\nSashiko reports for more incorrect IPv6 transport offsets.\n\nThe app code for TCP was assuming IPv4 network header\neven after the ipvsh argument was provided. This can\ncause problems with apps over IPv6. As for the only\nofficial app in the kernel tree (FTP) this problem is\nharmless because we use Netfilter to mangle the FTP\nports and we do not adjust the TCP seq numbers.\n\nAlso, provide correct offset of the ICMPV6 header in\nip_vs_out_icmp_v6() for correct checksum checks when\nthe IPv6 packet has extension headers."
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            "version": "3.1"
          },
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              "value": "AV:N - The bug is triggered when remote IPv6 packets traverse IPVS netfilter hooks (NF_INET_LOCAL_IN/OUT/FORWARD) on an internet-facing load balancer; attackers send crafted IPv6 traffic with extension headers to a configured virtual service without local access.\nAC:L - The attacker fully controls IPv6 extension headers and TCP/ICMPv6 packet contents on connections they initiate to the VIP; no race or privileged victim state is required beyond normal IPVS load-balancer operation.\nPR:N - Exploitation requires only the ability to send network traffic to an IPVS-managed VIP; the attacker needs no account or capabilities on the target host (IPVS configuration is an environmental prerequisite, not attacker privilege).\nUI:N - No victim user interaction is required beyond the attacker sending malicious IPv6 packets over an established or new connection to the load-balanced service.\nS:U - Impact is confined to kernel memory corruption and packet handling within the load-balancer host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Using ip_hdrlen() on IPv6 skbs reads TCP sequence/ack fields from the wrong skb offset (into the IPv6 header or extension-header area), constituting an out-of-bounds read exploitable for information disclosure.\nI:H - In ip_vs_out_icmp_v6, passing sizeof(ipv6hdr) instead of ipvsh-\u003elen causes ip_vs_nat_icmp_v6 to write ICMP/address/port fields at the wrong skb offset, corrupting extension headers or adjacent packet data.\nA:H - Corrupting IPv6/ICMP/TCP header fields in the skb can cause kernel oops, panics, or connection disruption on the load balancer when malformed packets are processed or forwarded."
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        "shortName": "Linux"
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    "datePublished": "2026-08-15T05:51:32.820Z",
    "dateReserved": "2026-07-30T09:28:09.396Z",
    "dateUpdated": "2026-08-17T05:39:19.469Z",
    "state": "PUBLISHED"
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As for the only\\nofficial app in the kernel tree (FTP) this problem is\\nharmless because we use Netfilter to mangle the FTP\\nports and we do not adjust the TCP seq numbers.\\n\\nAlso, provide correct offset of the ICMPV6 header in\\nip_vs_out_icmp_v6() for correct checksum checks when\\nthe IPv6 packet has extension headers.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/ipvs/ip_vs_app.c\",\"net/netfilter/ipvs/ip_vs_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"613ce63711b8d431bba90781f133c39a21684f87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"95d4511d81b2b37e5d2bdde5d912e48243eae517\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"3a9dc9b55b53d94613a587604b77d3b20024090c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"a3f0d5b605cd5da5c95279969fb8cea4e55cee5b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"7350eb7ead172ae8024897d4b0f2e15c5318279c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"d4ec18f48ce78a3bf7c999ac908691007375fe99\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"905d7a363ade96a19f214815361e11981142c547\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a3b791e6e1169f374224d164738e9f7be703d77\",\"lessThan\":\"b3fe4cbd583895987935a9bdad01c8f9d3a02310\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/ipvs/ip_vs_app.c\",\"net/netfilter/ipvs/ip_vs_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.28\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.28\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a9dc9b55b53d94613a587604b77d3b20024090c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/613ce63711b8d431bba90781f133c39a21684f87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7350eb7ead172ae8024897d4b0f2e15c5318279c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/905d7a363ade96a19f214815361e11981142c547\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95d4511d81b2b37e5d2bdde5d912e48243eae517\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3f0d5b605cd5da5c95279969fb8cea4e55cee5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3fe4cbd583895987935a9bdad01c8f9d3a02310\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4ec18f48ce78a3bf7c999ac908691007375fe99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:04:51+00:00",
      "cve": "CVE-2026-68477",
      "id": "CVE-2026-68477",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipvs: fix more places with wrong ipv6 transport offsets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68477.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.


Detection rules are retrieved from Rulezet.