Vulnerability-Lookup

FKIE_CVE-2026-46244

Vulnerability from fkie_nvd - Published: 2026-06-03 18:16 - Updated: 2026-08-19 12:18

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2. For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:33215
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34094
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34443
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34911
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36018
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:55618
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:55763
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:56225
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-46244
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2484451
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46244.json

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: Fix IPv6 inner_thoff desync\n\nIn nft_inner_parse_l2l3(), when processing inner IPv6 packets,\nipv6_find_hdr() correctly computes the transport header offset\ntraversing all extension headers, but the result is immediately\noverwritten with nhoff + sizeof(_ip6h) (40 bytes), which only\naccounts for the IPv6 base header. This creates a desync between\ninner_thoff (wrong \u2014 points to extension header start) and l4proto\n(correct \u2014 e.g., IPPROTO_TCP), enabling transport header forgery\nand potential firewall bypass. This issue affects stable versions\nfrom Linux 6.2.\n\nFor comparison, the normal (non-inner) IPv6 path correctly\npreserves ipv6_find_hdr()\u0027s result. Removing the incorrect overwrite\nensures that ipv6_find_hdr()\u0027s calculated transport header offset is\npreserved, thereby fixing the desynchronization."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nft_inner: Corregir la desincronizaci\u00f3n de inner_thoff de IPv6\n\nEn nft_inner_parse_l2l3(), al procesar paquetes IPv6 internos, ipv6_find_hdr() calcula correctamente el desplazamiento del encabezado de transporte atravesando todos los encabezados de extensi\u00f3n, pero el resultado es inmediatamente sobrescrito con nhoff + sizeof(_ip6h) (40 bytes), lo que solo tiene en cuenta el encabezado base de IPv6. Esto crea una desincronizaci\u00f3n entre inner_thoff (incorrecto - apunta al inicio del encabezado de extensi\u00f3n) y l4proto (correcto - p. ej., IPPROTO_TCP), lo que permite la falsificaci\u00f3n de encabezados de transporte y una posible omisi\u00f3n del cortafuegos. Este problema afecta a versiones estables a partir de Linux 6.2.\n\nA modo de comparaci\u00f3n, la ruta IPv6 normal (no interna) conserva correctamente el resultado de ipv6_find_hdr(). Eliminar la sobrescritura incorrecta asegura que el desplazamiento del encabezado de transporte calculado por ipv6_find_hdr() se preserve, corrigiendo as\u00ed la desincronizaci\u00f3n."
    }
  ],
  "id": "CVE-2026-46244",
  "lastModified": "2026-08-19T12:18:25.770",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "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:N",
          "version": "3.1"
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        "type": "Secondary"
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
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        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
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  "published": "2026-06-03T18:16:24.430",
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  "vulnStatus": "Modified",
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      "type": "Secondary"
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}

CVE-2026-46244 (GCVE-0-2026-46244)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:48 – Updated: 2026-08-19 12:05

Title

netfilter: nft_inner: Fix IPv6 inner_thoff desync

Summary

Severity

9.1 (Critical)


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

7.3 (High)


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

CWE

CWE-823 - Use of Out-of-range Pointer Offset

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

16 references

URL	Tags
https://git.kernel.org/stable/c/c161ad9157f5a0429…
https://git.kernel.org/stable/c/870d59e2cf218e741…
https://git.kernel.org/stable/c/689bbf48c1f451300…
https://git.kernel.org/stable/c/d0f98a3617f6ae5b1…
https://git.kernel.org/stable/c/b6a91f68ebfed9c38…
https://access.redhat.com/security/cve/CVE-2026-46244	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2484451	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:33215	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34911	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34443	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34094	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36018	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:55618	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:56225	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:55763	vendor-advisoryx_refsource_REDHAT

Impacted products

13 products

Vendor	Product	Version
Linux	Linux	Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < c161ad9157f5a0429b5ff94d9770faf3bf48d273 (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 870d59e2cf218e7418491e26bad768cb16654582 (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 689bbf48c1f45130086ae1c46ab83ea4c753c601 (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < b6a91f68ebfed9c38e0e9150f58a9b85da07181c (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:6.12.0-211.30.1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:6.12.0-55.84.1.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:5.14.0-687.22.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:5.14.0-427.135.1.el9_4 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:5.14.0-570.125.1.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	cpe:/o:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8

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              "lang": "en",
              "value": "AV:N - Exploitation is triggered when a remote attacker sends crafted tunneled packets (GRE/Geneve/VXLAN/UDP/TCP) that are evaluated on netfilter ingress/forward hooks, not via netlink rule installation.\nAC:L - The attacker fully controls packet layout including inner IPv6 extension headers and can reliably desynchronize inner_thoff from the real transport header without races or rare layout conditions.\nPR:N - The attacker needs no privileges on the victim; only pre-existing nftables rules using the inner expression must be present, which is victim infrastructure rather than attacker privilege.\nUI:N - No victim user action is required beyond normal network traffic processing once vulnerable firewall rules exist.\nS:U - Impact is bypass of host netfilter policy within the kernel network security boundary, not VM escape, container breakout, or crossing a separate hardware/IOMMU authority.\nC:H - Bypassing inner-header filtering can expose confidential services and data on protected internal networks that the firewall was meant to block from the attacker\u2019s network position.\nI:H - The desync allows forged inner transport matches so traffic can be misclassified, defeating integrity of nftables filtering decisions and permitting unauthorized flows.\nA:N - The bug misdirects skb_copy_bits reads within attacker-supplied packet data and yields NFT_BREAK on failure; it does not corrupt kernel memory or cause panics/oops."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:43.795Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c161ad9157f5a0429b5ff94d9770faf3bf48d273"
        },
        {
          "url": "https://git.kernel.org/stable/c/870d59e2cf218e7418491e26bad768cb16654582"
        },
        {
          "url": "https://git.kernel.org/stable/c/689bbf48c1f45130086ae1c46ab83ea4c753c601"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6a91f68ebfed9c38e0e9150f58a9b85da07181c"
        }
      ],
      "title": "netfilter: nft_inner: Fix IPv6 inner_thoff desync",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46244",
    "datePublished": "2026-06-03T15:48:59.049Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-08-19T12:05:18.939Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
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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.

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FKIE_CVE-2026-46244

CVE-2026-46244 (GCVE-0-2026-46244)

Tags

Sightings

Nomenclature

Related by attack behaviour