Vulnerability-Lookup

CVE-2026-74597 (GCVE-0-2026-74597)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40

Title

ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

Summary

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/44fe898df302e91c5…
https://git.kernel.org/stable/c/0dadb0620ab65949a…
https://git.kernel.org/stable/c/b6816536a2990c0db…
https://git.kernel.org/stable/c/64e41736a26f37ab6…
https://git.kernel.org/stable/c/484134e1eb07d700a…
https://git.kernel.org/stable/c/4eb15c465337b18f4…
https://git.kernel.org/stable/c/fbf40faa0414b7532…
https://git.kernel.org/stable/c/f803c086399da277b…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < 44fe898df302e91c5ee5acbc71ffa74e78e6c183 (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < 0dadb0620ab65949a8bc2439dd28ea3c942fe87d (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < b6816536a2990c0db44a26130a03e40b441e829b (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < 64e41736a26f37ab6215bc2e6df125df05aceb08 (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < 484134e1eb07d700a73b1e4bbf3fb503e299be60 (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < 4eb15c465337b18f44716c499cd6ad63eee0ad54 (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < fbf40faa0414b753212494ad197542002e66ed9e (git) Affected: e490d1d85cf5e191791979e5f260d32eb4f703a8 , < f803c086399da277b5d0ff36a107d0f162751800 (git)	guessed
Linux	Linux	Affected: 2.6.22 Unaffected: 0 , < 2.6.22 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

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            },
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              "status": "unaffected",
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              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet\u0027s inet6_skb_parm in skb-\u003ecb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)-\u003edsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2-\u003ecb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."
        }
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            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:N - The bug is reached when a remote peer sends a forged ICMPv6 error whose quoted payload is an IPv6-in-IPv6 tunnel datagram; processing follows the normal IPv6 receive path (ipv6_rcv -\u003e icmpv6_notify -\u003e tunnel6_err -\u003e ip6ip6_err) with no local access required.\nAC:L - The attacker controls the carrier IPv6 Home Address Option, quoted tunnel/inner headers, and ICMP error type; once an ip6tnl endpoint exists (normal for this subsystem), triggering the stale-dsthao path is reliable and needs no races or victim interaction.\nPR:N - No authentication or capabilities are required on the target; unprivileged remote senders can deliver crafted ICMPv6 errors that the kernel processes on the standard pre-auth receive path (INET6_PROTO_NOPOLICY).\nUI:N - Exploitation requires only delivering a malicious network packet; no victim must open files, click links, or perform any other action.\nS:U - Impact is in-kernel memory corruption on the receiving host within the same security authority; it does not by itself cross VM, container, or IOMMU boundaries.\nC:H - With CONFIG_IPV6_MIP6, mip6_addr_swap() uses the stale dsthao offset to scan the quoted inner packet and can read attacker-controlled bytes past the skb tail while resolving a fake HAO TLV before swapping addresses.\nI:H - The resulting 16-byte swap(iph-\u003esaddr, hao-\u003eaddr) can write beyond the quoted packet into skb_shared_info, giving attacker-influenced heap corruption suitable for further control-flow or data manipulation.\nA:H - Corrupting skb_shared_info from the network input path can cause kernel oops/panic or otherwise deny service on IPv6 tunnel endpoints, and the condition is repeatable with crafted packets."
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:23.709Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()",
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    "datePublished": "2026-08-22T15:31:47.120Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:23.709Z",
    "state": "PUBLISHED"
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      "date": "2026-08-24",
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      "percentile": "0.07214"
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      "cve": "CVE-2026-74597",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74597.json",
      "version": "2"
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A malformed inner destination-options header can then make\\nthe HAO lookup and address swap run past the end of the quoted packet\\nand corrupt skb_shared_info.\\n\\nClear skb2-\u003ecb[] before pulling the quoted inner IPv6 packet so the\\nreply path does not reuse metadata left by the outer IPv6 stack.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_tunnel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"44fe898df302e91c5ee5acbc71ffa74e78e6c183\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"0dadb0620ab65949a8bc2439dd28ea3c942fe87d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"b6816536a2990c0db44a26130a03e40b441e829b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"64e41736a26f37ab6215bc2e6df125df05aceb08\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"484134e1eb07d700a73b1e4bbf3fb503e299be60\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"4eb15c465337b18f44716c499cd6ad63eee0ad54\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"fbf40faa0414b753212494ad197542002e66ed9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e490d1d85cf5e191791979e5f260d32eb4f703a8\",\"lessThan\":\"f803c086399da277b5d0ff36a107d0f162751800\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_tunnel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.22\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.22\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"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/0dadb0620ab65949a8bc2439dd28ea3c942fe87d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T06:02:43+00:00",
      "cve": "CVE-2026-74597",
      "id": "CVE-2026-74597",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74597.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:06:14Z",
      "cve": "CVE-2026-74597",
      "id": "CVE-2026-74597",
      "initial_release_date": "2026-08-23T00:06:14Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74597",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74597.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-74597

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

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

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "b6816536a2990c0db44a26130a03e40b441e829b",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "fbf40faa0414b753212494ad197542002e66ed9e",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            },
            {
              "lessThan": "f803c086399da277b5d0ff36a107d0f162751800",
              "status": "affected",
              "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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\nip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet\u0027s inet6_skb_parm in skb-\u003ecb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)-\u003edsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2-\u003ecb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."
    }
  ],
  "id": "CVE-2026-74597",
  "lastModified": "2026-08-25T06:18:35.440",
  "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"
      }
    ]
  },
  "published": "2026-08-22T16:16:32.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-2FQW-FH97-QVMC

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb.

If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info.

Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.

Severity

9.8 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74597"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:32Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet\u0027s inet6_skb_parm in skb-\u003ecb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)-\u003edsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2-\u003ecb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack.",
  "id": "GHSA-2fqw-fh97-qvmc",
  "modified": "2026-08-25T06:31:21Z",
  "published": "2026-08-22T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74597"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-74597

Vulnerability from csaf_microsoft - Published: 2026-08-24 01:01 - Updated: 2026-08-24 14:46

Summary

ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-74597

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-74597 ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74597.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()",
    "tracking": {
      "current_release_date": "2026-08-24T14:46:12.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.279Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-74597",
      "initial_release_date": "2026-08-24T01:01:37.000Z",
      "revision_history": [
        {
          "date": "2026-08-24T01:01:37.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:46:12.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.150.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-74597",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-74597 ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74597.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-24T01:01:37.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "ip6_tunnel: clear skb2-\u003ecb[] in ip6ip6_err()"
    }
  ]
}

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.

Action not permitted

CVE-2026-74597 (GCVE-0-2026-74597)

FKIE_CVE-2026-74597

GHSA-2FQW-FH97-QVMC

MSRC_CVE-2026-74597

Tags

Sightings

Nomenclature