8.8 CVE-2026-43284

Enriched by CISA Patch Exploit
 

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().
https://nvd.nist.gov/vuln/detail/CVE-2026-43284

Categories

CWE-123 : Write-what-where Condition
Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) Use tools that are integrated duringcompilation to insert runtime error-checking mechanismsrelated to memory safety errors, such as AddressSanitizer(ASan) for C/C++ [REF-1518]. Use a language that provides appropriate memory abstractions. Use OS-level preventative functionality integrated after the fact. Not a complete solution. Chain: Python library does not limit the resources used to process images that specify a very large number of bands (CWE-1284), leading to excessive memory consumption (CWE-789) or an integer overflow (CWE-190). Chain: 3D renderer has an integer overflow (CWE-190) leading to write-what-where condition (CWE-123) using a crafted image.

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < a6cb440f274a22456ef3e86b457344f1678f38f9 [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < ab8b995323e5237041472d07e5055f5f7dcdf15b [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < fe785bb3a8096dffcc4048a85cd0c83337eeecad [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 5d55c7336f8032d434adcc5fab987ccc93a44aec [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 8253aab4659ca16116b522203c2a6b18dccacea7 [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 50ed1e7873100f77abad20fd31c51029bc49cd03 [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < b54edf1e9a3fd3491bdcb82a21f8d21315271e0d [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 71a1d9d985d26716f74d21f18ee8cac821b06e97 [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < 52646cbd00e765a6db9c3afe9535f26218276034 [affected]
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 < f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4 [affected]
Linux Linux
  • 4.11 [affected]
  • < 4.11 [unaffected]
  • 5.10.255 ≤ 5.10.* [unaffected]
  • 5.15.205 ≤ 5.15.* [unaffected]
  • 5.15.206 ≤ 5.15.* [unaffected]
  • 6.1.171 ≤ 6.1.* [unaffected]
  • 6.1.172 ≤ 6.1.* [unaffected]
  • 6.6.138 ≤ 6.6.* [unaffected]
  • 6.12.87 ≤ 6.12.* [unaffected]
  • 6.18.28 ≤ 6.18.* [unaffected]
  • 7.0.5 ≤ 7.0.* [unaffected]
  • 7.1-rc3 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 4.11 < 5.10.255
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.12 < 5.15.205
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 5.16 < 6.1.171
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.2 < 6.6.138
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.7 < 6.12.87
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.13 < 6.18.28
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 7.0 < 7.0.5

REMEDIATION

Patch

Url
https://git.kernel.org/stable/c/50ed1e7873100f77abad20fd31c51029bc49cd03
https://git.kernel.org/stable/c/52646cbd00e765a6db9c3afe9535f26218276034
https://git.kernel.org/stable/c/5d55c7336f8032d434adcc5fab987ccc93a44aec
https://git.kernel.org/stable/c/71a1d9d985d26716f74d21f18ee8cac821b06e97
https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9
https://git.kernel.org/stable/c/ab8b995323e5237041472d07e5055f5f7dcdf15b
https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d

EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
https://github.com/linnemanlabs/dirtyfrag-arm64
https://github.com/FrosterDL/CVE-2026-43284
https://github.com/grabesec/XCP_ng_CVE-2026-43284_tester
https://github.com/jayhutajulu1/CVE-2026-43284-DirtyFrag-PoC

Other Nist (github, ...)

Url
https://github.com/V4bel/dirtyfrag

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry