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

Vulnerability from cvelistv5 – Published: 2026-05-08 07:21 – Updated: 2026-05-26 17:32
VLAI
Title
xfrm: esp: avoid in-place decrypt on shared skb frags
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().
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
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-123 - Write-what-where Condition
Assigner
References
Impacted 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)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
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\"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-43284\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-08T13:52:05.570311Z\"}}}], \"references\": [{\"url\": \"https://github.com/V4bel/dirtyfrag\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-123\", \"description\": \"CWE-123 Write-what-where Condition\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": 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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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.255\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.205\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.206\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.171\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.172\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.138\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.87\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.28\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.5\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1-rc3\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T22:21:34.920Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43284\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-26T17:32:27.236Z\", \"dateReserved\": \"2026-05-01T14:12:55.998Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-08T07:21:47.524Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.