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CVE-2026-72250 (GCVE-0-2026-72250)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:54 – Updated: 2026-08-17 05:42
VLAI
Title
netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag nf_ct_frag6_reasm() slides the packet head forward to drop the IPv6 fragment header and then unconditionally advances skb->mac_header: skb->mac_header += sizeof(struct frag_hdr); On the NF_INET_LOCAL_OUT defrag path the skb has no link-layer header yet, so skb->mac_header is still the "not set" sentinel (u16)~0U. Adding sizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7), after which skb_mac_header_was_set() wrongly reports a MAC header is present and skb_mac_header() points into the headroom. The reassembler has done this unconditional add since it was introduced; it was harmless while mac_header was a bare pointer, but wrong once mac_header became a u16 offset whose unset state is the ~0U sentinel tested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c does the same relocation and does guard the adjustment; mirror the guard here.
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: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 6e8cd710ca35c576f5f2e5a396047c9ac61f75e5 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 2a95ec21824a8ad81ad660b12231456fc0ac9830 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < bbcdef2061b170af45702ce6b359c02c12acfc94 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 53ef70a315420ed31581d38343684b3bf9a3c76d (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < a58230f3a7c4f6c3261786bc1efb72c42e68cd25 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 00bdce2fda7e430d24cfbc96764a1b96deb31f82 (git)
Affected: 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 , < 3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.15
Unaffected: 0 , < 2.6.15 (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)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag\n\nnf_ct_frag6_reasm() slides the packet head forward to drop the IPv6\nfragment header and then unconditionally advances skb-\u003emac_header:\n\n\tskb-\u003emac_header += sizeof(struct frag_hdr);\n\nOn the NF_INET_LOCAL_OUT defrag path the skb has no link-layer header\nyet, so skb-\u003emac_header is still the \"not set\" sentinel (u16)~0U. Adding\nsizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7),\nafter which skb_mac_header_was_set() wrongly reports a MAC header is\npresent and skb_mac_header() points into the headroom.\n\nThe reassembler has done this unconditional add since it was introduced;\nit was harmless while mac_header was a bare pointer, but wrong once\nmac_header became a u16 offset whose unset state is the ~0U sentinel\ntested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c\ndoes the same relocation and does guard the adjustment; mirror the\nguard here."
        }
      ],
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        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The bug triggers only when nf_ct_frag6_reasm() runs on NF_INET_LOCAL_OUT with skb-\u003emac_header still unset (~0U). That requires injecting pre-fragmented IPv6 into the local output path (e.g., AF_INET6 SOCK_RAW), not standard remotely received PRE_ROUTING traffic where mac_header is already valid and the adjustment is correct.\nAC:L - An attacker who can send raw IPv6 fragments can reliably complete conntrack reassembly by crafting matching fragment ID/source/destination tuples. nf_defrag_ipv6 is enabled automatically whenever IPv6 connection tracking is in use (typical on nftables/iptables hosts), so no rare race or admin-only timing is needed.\nPR:L - Triggering handcrafted IPv6 fragments requires CAP_NET_RAW. On systems with unprivileged user namespaces, a local user can obtain CAP_NET_RAW (and CAP_NET_ADMIN for conntrack) via unshare -Urn, so required privileges are Low rather than High root-only access.\nUI:N - Exploitation requires only attacker-controlled fragmented IPv6 traffic and an active conntrack defrag path; it does not depend on any victim user action such as opening files, mounting filesystems, or clicking links.\nS:U - Impact is skb metadata corruption within the kernel network stack in the same security domain. It does not inherently cross VM, container runtime, or IOMMU boundaries without separate privilege-escalation exploitation.\nC:H - Adding sizeof(frag_hdr) to the unset mac_header sentinel wraps to a small offset, so skb_mac_header_was_set() becomes true and skb_mac_header() points into skb headroom. Downstream netfilter/nft L2 helpers can then perform out-of-bounds reads, leaking stale kernel data from headroom.\nI:H - The bogus mac_header and inflated skb_mac_header_len() misdirect later L2 header access and nft payload/meta write paths to incorrect offsets in skb headroom or packet data, enabling memory corruption that can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - Corrupted skb header state can cause kernel oops, panic, or fatal faults when subsequent LOCAL_OUT, netfilter, or output routines use the invalid MAC header pointer, and the associated memory corruption can crash the system even without full exploit development."
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        "dateUpdated": "2026-08-17T05:42:02.183Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag",
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    "dateReserved": "2026-08-09T03:40:39.915Z",
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Adding\\nsizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7),\\nafter which skb_mac_header_was_set() wrongly reports a MAC header is\\npresent and skb_mac_header() points into the headroom.\\n\\nThe reassembler has done this unconditional add since it was introduced;\\nit was harmless while mac_header was a bare pointer, but wrong once\\nmac_header became a u16 offset whose unset state is the ~0U sentinel\\ntested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c\\ndoes the same relocation and does guard the adjustment; mirror the\\nguard here.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/netfilter/nf_conntrack_reasm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"6e8cd710ca35c576f5f2e5a396047c9ac61f75e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"2a95ec21824a8ad81ad660b12231456fc0ac9830\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"bbcdef2061b170af45702ce6b359c02c12acfc94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"53ef70a315420ed31581d38343684b3bf9a3c76d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"a58230f3a7c4f6c3261786bc1efb72c42e68cd25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"00bdce2fda7e430d24cfbc96764a1b96deb31f82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1\",\"lessThan\":\"3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/netfilter/nf_conntrack_reasm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.15\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00bdce2fda7e430d24cfbc96764a1b96deb31f82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a95ec21824a8ad81ad660b12231456fc0ac9830\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53ef70a315420ed31581d38343684b3bf9a3c76d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e8cd710ca35c576f5f2e5a396047c9ac61f75e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a58230f3a7c4f6c3261786bc1efb72c42e68cd25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbcdef2061b170af45702ce6b359c02c12acfc94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T17:59:11+00:00",
      "cve": "CVE-2026-72250",
      "id": "CVE-2026-72250",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72250.json",
      "version": "3"
    }
  }
}



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  • 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.