CVE-2026-43284
Estado: ModificadaAlta (8.8)—
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.
Leer descripción completaMostrar menos
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().
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 2.47%
- Percentil entre todas las CVEs puntuadas: 84
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1565.001Stored Data Manipulationimpact70 %
Acceso local (AV:L) sin interacción (UI:N) con privilegios (PR:L) permite escalada de privilegios (S:C con C:H/I:H/A:H). Ejecución de código y corrupción de datos en memoria compartida de la red de datagramas UDP/ESP.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-123
- CWE-123
Referencias
- 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/8253aab4659ca16116b522203c2a6b18dccacea7
- https://git.kernel.org/stable/c/a6cb440f274a22456ef3e86b457344f1678f38f9
- https://git.kernel.org/stable/c/ab8b995323e5237041472d07e5055f5f7dcdf15b
- https://git.kernel.org/stable/c/b54edf1e9a3fd3491bdcb82a21f8d21315271e0d
- https://git.kernel.org/stable/c/f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4
- https://git.kernel.org/stable/c/fe785bb3a8096dffcc4048a85cd0c83337eeecad
- http://www.openwall.com/lists/oss-security/2026/05/08/7
- http://www.openwall.com/lists/oss-security/2026/05/13/6
- http://www.openwall.com/lists/oss-security/2026/05/14/2
- http://www.openwall.com/lists/oss-security/2026/05/14/4
- https://www.vicarius.io/vsociety/posts/cve-2026-43284-detection-script-dirty-frag-linux-kernel-local-privilege-escalation
- https://www.vicarius.io/vsociety/posts/cve-2026-43284-mitigation-script-dirty-frag-linux-kernel-local-privilege-escalation
- https://access.redhat.com/errata/RHSA-2026:16061
- https://access.redhat.com/errata/RHSA-2026:16062
- https://access.redhat.com/errata/RHSA-2026:16100
- https://access.redhat.com/errata/RHSA-2026:16155
- https://access.redhat.com/errata/RHSA-2026:16157
- https://access.redhat.com/errata/RHSA-2026:16160
- https://access.redhat.com/errata/RHSA-2026:16161
- https://access.redhat.com/errata/RHSA-2026:16171
- https://access.redhat.com/errata/RHSA-2026:16176
- https://access.redhat.com/errata/RHSA-2026:16180
- https://access.redhat.com/errata/RHSA-2026:16195
- https://access.redhat.com/errata/RHSA-2026:16196
- https://access.redhat.com/errata/RHSA-2026:16201
- https://access.redhat.com/errata/RHSA-2026:16202
- https://access.redhat.com/errata/RHSA-2026:16203
- https://access.redhat.com/errata/RHSA-2026:16204
- https://access.redhat.com/errata/RHSA-2026:16206
- https://access.redhat.com/errata/RHSA-2026:16254
- https://access.redhat.com/errata/RHSA-2026:16312
- https://access.redhat.com/errata/RHSA-2026:16314
- https://access.redhat.com/errata/RHSA-2026:16328
- https://access.redhat.com/errata/RHSA-2026:17795
- https://access.redhat.com/errata/RHSA-2026:18025
- https://access.redhat.com/errata/RHSA-2026:19074
- https://access.redhat.com/errata/RHSA-2026:19225
- https://access.redhat.com/errata/RHSA-2026:19564
- https://access.redhat.com/errata/RHSA-2026:19568
- https://access.redhat.com/errata/RHSA-2026:19569
- https://access.redhat.com/errata/RHSA-2026:19572
- https://access.redhat.com/errata/RHSA-2026:19573
- https://access.redhat.com/errata/RHSA-2026:19574
- https://access.redhat.com/errata/RHSA-2026:19575
- https://access.redhat.com/errata/RHSA-2026:19577
- https://access.redhat.com/errata/RHSA-2026:21695
- https://access.redhat.com/errata/RHSA-2026:23233
- https://access.redhat.com/errata/RHSA-2026:26542
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHSA-2026:34098
- https://access.redhat.com/security/cve/CVE-2026-43284
- https://bugzilla.redhat.com/show_bug.cgi?id=2467771
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://github.com/V4bel/dirtyfrag
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43284.json
JSON original (NVD)
Mostrar
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{
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"tags": [
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"description": [
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"value": "CWE-123"
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"value": "CWE-123"
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"descriptions": [
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"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->data_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()."
}
],
"lastModified": "2026-09-08T09:18:03.953",
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