Vulnerability-Lookup

FKIE_CVE-2026-64414

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-27 05:16

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: handle unreadable frags sashiko reports: When an skb with unreadable fragments (such as from devmem TCP, where skb_frags_readable(skb) returns false) is processed by the u32 module, skb_copy_bits() will safely return a negative error code [..] xt_u32: bail out with hotdrop in this case. gather_frags: return -1, just as if we had no fragment header. nfnetlink_queue: restrict to the linear part. nfnetlink_log: restrict to the linear part. v2: - skb_zerocopy helpers don't copy readable flag, i.e. nfnetlink_queue is broken too xt_u32 shouldn't return true if hotdrop was set.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/nf_conntrack_reasm.c",
            "net/netfilter/nfnetlink_log.c",
            "net/netfilter/nfnetlink_queue.c",
            "net/netfilter/xt_u32.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b13e7635795394705920cca1e1db7e4ca2e334b",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "fc5bfe63bacf8a3ae307b62b34206406ca733354",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "57056be3ec12e7d9ecd20a60d4060f510e4f284c",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "da5b58478a9c1b85608c9e40a3b8432d071b409e",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/nf_conntrack_reasm.c",
            "net/netfilter/nfnetlink_log.c",
            "net/netfilter/nfnetlink_queue.c",
            "net/netfilter/xt_u32.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "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\nnetfilter: handle unreadable frags\n\nsashiko reports:\n When an skb with unreadable fragments (such as from devmem TCP, where\n skb_frags_readable(skb) returns false) is processed by the u32 module,\n skb_copy_bits() will safely return a negative error code [..]\n\nxt_u32: bail out with hotdrop in this case.\ngather_frags: return -1, just as if we had no fragment header.\nnfnetlink_queue: restrict to the linear part.\nnfnetlink_log: restrict to the linear part.\n\nv2:\n - skb_zerocopy helpers don\u0027t copy readable flag, i.e. nfnetlink_queue\n is broken too\n xt_u32 shouldn\u0027t return true if hotdrop was set."
    }
  ],
  "id": "CVE-2026-64414",
  "lastModified": "2026-07-27T05:16:48.540",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-25T10:17:25.237",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-64414 (GCVE-0-2026-64414)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-05 12:41

Title

netfilter: handle unreadable frags

Summary

Severity

7.5 (High)


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

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/3b13e763579539470…
https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae…
https://git.kernel.org/stable/c/57056be3ec12e7d9e…
https://git.kernel.org/stable/c/da5b58478a9c1b856…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 65249feb6b3df9e17bab5911ee56fa7b0971e231 , < 3b13e7635795394705920cca1e1db7e4ca2e334b (git) Affected: 65249feb6b3df9e17bab5911ee56fa7b0971e231 , < fc5bfe63bacf8a3ae307b62b34206406ca733354 (git) Affected: 65249feb6b3df9e17bab5911ee56fa7b0971e231 , < 57056be3ec12e7d9ecd20a60d4060f510e4f284c (git) Affected: 65249feb6b3df9e17bab5911ee56fa7b0971e231 , < da5b58478a9c1b85608c9e40a3b8432d071b409e (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/nf_conntrack_reasm.c",
            "net/netfilter/nfnetlink_log.c",
            "net/netfilter/nfnetlink_queue.c",
            "net/netfilter/xt_u32.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b13e7635795394705920cca1e1db7e4ca2e334b",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "fc5bfe63bacf8a3ae307b62b34206406ca733354",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "57056be3ec12e7d9ecd20a60d4060f510e4f284c",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            },
            {
              "lessThan": "da5b58478a9c1b85608c9e40a3b8432d071b409e",
              "status": "affected",
              "version": "65249feb6b3df9e17bab5911ee56fa7b0971e231",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/netfilter/nf_conntrack_reasm.c",
            "net/netfilter/nfnetlink_log.c",
            "net/netfilter/nfnetlink_queue.c",
            "net/netfilter/xt_u32.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc3",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: handle unreadable frags\n\nsashiko reports:\n When an skb with unreadable fragments (such as from devmem TCP, where\n skb_frags_readable(skb) returns false) is processed by the u32 module,\n skb_copy_bits() will safely return a negative error code [..]\n\nxt_u32: bail out with hotdrop in this case.\ngather_frags: return -1, just as if we had no fragment header.\nnfnetlink_queue: restrict to the linear part.\nnfnetlink_log: restrict to the linear part.\n\nv2:\n - skb_zerocopy helpers don\u0027t copy readable flag, i.e. nfnetlink_queue\n is broken too\n xt_u32 shouldn\u0027t return true if hotdrop was set."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Unreadable skbs arise on the receive side of device-memory TCP, and a remote peer can send packets that traverse netfilter hooks into u32, NFLOG, NFQUEUE, or IPv6 conntrack defragmentation. No local access is required in a network-exposed devmem TCP deployment.\nAC:L - Once devmem/header-split RX and an affected netfilter path are active, a sufficiently long payload or crafted IPv6 extension/fragment layout reliably reaches unreadable fragments. There is no race or condition the attacker must win, and triggering packets can be sent repeatedly.\nPR:N - The triggering packets are processed before application authentication, so the remote peer needs no account or kernel capability. CAP_NET_ADMIN is required for the operator\u0027s device and netfilter configuration, not for the attacker sending packets.\nUI:N - Packet reception and netfilter processing occur automatically without any victim action after the service and policy are configured.\nS:U - The resulting failure affects the same host kernel and does not cross a VM, IOMMU, or other distinct security authority boundary.\nC:N - skb_copy_bits() rejects the unreadable fragments before accessing their contents, while the NFQUEUE flag-loss path reaches an invalid page mapping. No attacker-accessible information-disclosure primitive was identified.\nI:N - The vulnerability causes BUG or invalid-access paths but provides no out-of-bounds write, use-after-free, type confusion, or attacker-controlled data modification.\nA:H - The u32, NFLOG, and IPv6 paths execute BUG(), and the NFQUEUE path can dereference an invalid page during netlink recvmsg. These can produce a kernel oops or panic and can be triggered repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:41:49.126Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354"
        },
        {
          "url": "https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c"
        },
        {
          "url": "https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e"
        }
      ],
      "title": "netfilter: handle unreadable frags",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64414",
    "datePublished": "2026-07-25T08:50:54.495Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-08-05T12:41:49.126Z",
    "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.

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.

Action not permitted

FKIE_CVE-2026-64414

CVE-2026-64414 (GCVE-0-2026-64414)

Tags

Sightings

Nomenclature