Vulnerability-Lookup

FKIE_CVE-2026-43284

Vulnerability from fkie_nvd - Published: 2026-05-08 08:16 - Updated: 2026-05-14 17:16

Severity ?

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

Summary

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs without a frag_list and decrypts in place over data that is not owned privately by the skb. Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching TCP. Also make ESP input fall back to skb_cow_data() when the flag is present, so ESP does not decrypt externally backed frags in place. Private nonlinear skb frags still use the existing fast path. This intentionally does not change ESP output. In esp_output_head(), the path that appends the ESP trailer to existing skb tailroom without calling skb_cow_data() is not reachable for nonlinear skbs: skb_tailroom() returns zero when skb->data_len is nonzero, while ESP tailen is positive. Thus ESP output will either use the separate destination-frag path or fall back to skb_cow_data().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d55c7336f8032d434adcc5fab987ccc93a44aec	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8253aab4659ca16116b522203c2a6b18dccacea7
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ab8b995323e5237041472d07e5055f5f7dcdf15b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe785bb3a8096dffcc4048a85cd0c83337eeecad
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/08/7	Mailing List
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/13/6
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/14/2
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/14/4
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/V4bel/dirtyfrag	Exploit, Third Party Advisory

Impacted products

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

JSON

To clipboard

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CVE-2026-43284 (GCVE-0-2026-43284)

Vulnerability from cvelistv5 – Published: 2026-05-08 07:21 – Updated: 2026-05-14 16:40

Title

xfrm: esp: avoid in-place decrypt on shared skb frags

Summary

Severity ?

8.8 (High)


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

CWE

CWE-123 - Write-what-where Condition

Assigner

Linux

References

10 references

URL	Tags
https://git.kernel.org/stable/c/a6cb440f274a22456…
https://git.kernel.org/stable/c/ab8b995323e523704…
https://git.kernel.org/stable/c/fe785bb3a8096dffc…
https://git.kernel.org/stable/c/5d55c7336f8032d43…
https://git.kernel.org/stable/c/8253aab4659ca1611…
https://git.kernel.org/stable/c/50ed1e7873100f77a…
https://git.kernel.org/stable/c/b54edf1e9a3fd3491…
https://git.kernel.org/stable/c/71a1d9d985d26716f…
https://git.kernel.org/stable/c/52646cbd00e765a6d…
https://git.kernel.org/stable/c/f4c50a4034e62ab75…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < a6cb440f274a22456ef3e86b457344f1678f38f9 (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < ab8b995323e5237041472d07e5055f5f7dcdf15b (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < fe785bb3a8096dffcc4048a85cd0c83337eeecad (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < 5d55c7336f8032d434adcc5fab987ccc93a44aec (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < 8253aab4659ca16116b522203c2a6b18dccacea7 (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < 50ed1e7873100f77abad20fd31c51029bc49cd03 (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < b54edf1e9a3fd3491bdcb82a21f8d21315271e0d (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < 71a1d9d985d26716f74d21f18ee8cac821b06e97 (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < 52646cbd00e765a6db9c3afe9535f26218276034 (git) Affected: cac2661c53f35cbe651bef9b07026a5a05ab8ce0 , < f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4 (git)
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.255 , ≤ 5.10.* (semver) Unaffected: 5.15.205 , ≤ 5.15.* (semver) Unaffected: 5.15.206 , ≤ 5.15.* (semver) Unaffected: 6.1.171 , ≤ 6.1.* (semver) Unaffected: 6.1.172 , ≤ 6.1.* (semver) Unaffected: 6.6.138 , ≤ 6.6.* (semver) Unaffected: 6.12.87 , ≤ 6.12.* (semver) Unaffected: 6.18.28 , ≤ 6.18.* (semver) Unaffected: 7.0.5 , ≤ 7.0.* (semver) Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/esp4.c",
            "net/ipv4/ip_output.c",
            "net/ipv6/esp6.c",
            "net/ipv6/ip6_output.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.255",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.205",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.206",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.171",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.172",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.138",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.28",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.255",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.205",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.206",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.171",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.172",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.138",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.87",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.28",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.5",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc3",
                  "versionStartIncluding": "4.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: avoid in-place decrypt on shared skb frags\n\nMSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP\nmarks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(),\nso later paths that may modify packet data can first make a private\ncopy. The IPv4/IPv6 datagram append paths did not set this flag when\nsplicing pages into UDP skbs.\n\nThat leaves an ESP-in-UDP packet made from shared pipe pages looking\nlike an ordinary uncloned nonlinear skb. ESP input then takes the no-COW\nfast path for uncloned skbs without a frag_list and decrypts in place\nover data that is not owned privately by the skb.\n\nMark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching\nTCP. Also make ESP input fall back to skb_cow_data() when the flag is\npresent, so ESP does not decrypt externally backed frags in place.\nPrivate nonlinear skb frags still use the existing fast path.\n\nThis intentionally does not change ESP output. In esp_output_head(),\nthe path that appends the ESP trailer to existing skb tailroom without\ncalling skb_cow_data() is not reachable for nonlinear skbs:\nskb_tailroom() returns zero when skb-\u003edata_len is nonzero, while ESP\ntailen is positive. Thus ESP output will either use the separate\ndestination-frag path or fall back to skb_cow_data()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:21:34.920Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab8b995323e5237041472d07e5055f5f7dcdf15b"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe785bb3a8096dffcc4048a85cd0c83337eeecad"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d55c7336f8032d434adcc5fab987ccc93a44aec"
        },
        {
          "url": "https://git.kernel.org/stable/c/8253aab4659ca16116b522203c2a6b18dccacea7"
        },
        {
          "url": "https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03"
        },
        {
          "url": "https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97"
        },
        {
          "url": "https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4"
        }
      ],
      "title": "xfrm: esp: avoid in-place decrypt on shared skb frags",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43284",
    "datePublished": "2026-05-08T07:21:47.524Z",
    "dateReserved": "2026-05-01T14:12:55.998Z",
    "dateUpdated": "2026-05-14T16:40:12.480Z",
    "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.

Action not permitted

FKIE_CVE-2026-43284

CVE-2026-43284 (GCVE-0-2026-43284)

Tags

Sightings

Nomenclature