CVE-2026-31431highbajo ataqueCWE-1288CWE-669

CVE-2026-31431: fallo de gravedad alta en Linux

crypto: algif_aead - Revert to operating out-of-place

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear Linux+ Monitorear linux

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

100Vexday Risk Score

Corrige ahora. Ella está bajo explotación confirmada por CISA, tiene alerta oficial del gobierno de Brasil y tiene exploit funcional público.

ssvc Actcvss 7.8epss 98%
de la publicación al armael mismo día
Publicada en NVD22 abr
1ª PoC8 mar
metasploit+7d
CISA KEV+9d
Alerta oficial en Brasil

El gobierno federal de Brasil publicó una alerta, recomendación o boletín que cita esta vulnerabilidad.

  • CTIR Gov · ALERTA 32/2026Vulnerabilidade Crítica "Copy Fail" no Kernel Linuxleer en gov.br ↗
Fuente: CTIR Gov (GSI) y CISC Gov.br, bajo licencia CC BY-ND 3.0.
Lo que declaran los fabricantes (VEX)

Declaraciones oficiales de los fabricantes en formato CSAF/VEX: si su producto está afectado, ya corregido o descartado — y por qué. Es afirmación del fabricante, no juicio de Vexday.

Red Hatdocumento VEX ↗
Afectado
1 producto
Red Hat OpenShift Container Platform 4
workaround: See the security bulletin for a detailed mitigation procedure.
Corregido
55 productos (3276 componentes)
Red Hat Enterprise Linux BaseOS (v. 9) · Red Hat Enterprise Linux BaseOS (v. 10) · Red Hat Enterprise Linux AppStream (v. 10) · Red Hat Enterprise Linux AppStream (v. 9) · Red Hat Enterprise Linux BaseOS EUS (v.9.4) · y otros 50
corrección ↗
No afectado
2 productos (42 componentes) — porque el código vulnerable no está presente en el producto
Red Hat Enterprise Linux 7 · Red Hat Enterprise Linux 6
Acción exigida por CISAplazo federal: 2026-05-15

"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

En resumen

Una falla en el módulo de cifrado AEAD del kernel Linux permitía operaciones de cifrado ineficientes e inseguras en la misma ubicación de memoria. La corrección vuelve a usar operaciones separadas donde la entrada y salida se mantienen en ubicaciones distintas, mejorando seguridad y rendimiento.

Detalle técnico

CVE-2026-31431 aborda una vulnerabilidad en algif_aead (interfaz de algoritmo AEAD) del subsistema criptográfico del kernel Linux, donde operaciones de cifrado in-place agregaban complejidad innecesaria y riesgos de seguridad. La vulnerabilidad surge del intento de operar en la misma ubicación de memoria para origen y destino cuando estos buffers provienen de asignaciones de memoria diferentes; la solución revierte a operaciones out-of-place que copian datos asociados directamente, eliminando superficie de ataque.

Resumen generado y traducido por IA a partir de la descripción oficial.

El análisis completo de esta CVE está disponible en portugués →

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Productos afectados
Linux · Linux
PoCs públicas encontradas — 304
githubgithub.com/tgies/copy-fail-c★ 434githubgithub.com/cozystack/copy-fail-blocker★ 31githubgithub.com/KaraZajac/DIRTYFAIL★ 23githubgithub.com/sgkdev/ptrace_may_dream★ 20githubgithub.com/Smarttfoxx/copyfail★ 20githubgithub.com/JuanBindez/CVE-2026-31431★ 14githubgithub.com/philfry/cve-2026-31431-ftrace★ 12githubgithub.com/yandex-cloud-examples/yc-mk8s-copy-fail-mitigation★ 10githubgithub.com/ochebotar/copy-fail-CVE-2026-31431-detection-probe★ 10githubgithub.com/4xura/CVE-2026-31431-Copy-Fail★ 6githubgithub.com/infiniroot/ansible-mitigate-copyfail-dirtyfrag★ 6githubgithub.com/samanzamani/copy-fail-checker★ 4githubgithub.com/haydenjames/CVE-2026-31431-check★ 3githubgithub.com/guiimoraes/CVE-2026-31431★ 3githubgithub.com/lonelyor/CVE-2026-31431-exp★ 3githubgithub.com/Koshmare-Blossom/Copyfail-sh★ 3githubgithub.com/Pithase/asm-copyfail★ 3githubgithub.com/bootsareme/copyfail-deconstructed★ 3githubgithub.com/Dullpurple-sloop726/CVE-2026-31431-Linux-Copy-Fail★ 3githubgithub.com/insomnisec/Detections-CVE-2026-31431★ 2githubgithub.com/juliosuas/copyfail-guard★ 2githubgithub.com/rvzsec/CVE-2026-31431★ 2githubgithub.com/waltrone1/copyfail-safe-check★ 2githubgithub.com/krisiasty/vcheck★ 2githubgithub.com/Aurillium/RootRemover★ 2githubgithub.com/Iamliuxiaozhen/copy_fail★ 2githubgithub.com/st4rburn/RootRemover★ 2githubgithub.com/adityasingh108/CVE-2026-31431-Metasploit-exploit★ 2githubgithub.com/4n4s4zi/copyfail-alpine★ 1githubgithub.com/gagaltotal/cve-2026-31431-copy-fail★ 1githubgithub.com/Juguitos/copy-fail★ 1githubgithub.com/OpenPixelSystems/c-copy-fail★ 1githubgithub.com/gbonacini/CVE-2026-31431★ 1githubgithub.com/Lutfifakee-Project/CVE-2026-31431★ 1githubgithub.com/dgrobinson0/CopyFile_CVE-2026-31431★ 1githubgithub.com/itsystem/afalg-check★ 1githubgithub.com/studiogangster/CVE-2026-31431★ 1githubgithub.com/karollooool/Porting-CVE-2026-31431-Copy-Fail-to-a-Constrained-Java-Runner★ 1githubgithub.com/1neptune/CopyFail★ 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CVEs relacionadas — Linux

En el mismo producto, de las más peligrosas a las menos.

CVE-2026-46300HIGHnet: skbuff: preserve shared-frag marker during coalescingEPSS 16.1%KEVCVE-2024-53197HIGHALSA: usb-audio: Fix potential out-of-bound accesses for Extigy and Mbox devicesEPSS 4.1%KEVCVE-2024-53104HIGHmedia: uvcvideo: Skip parsing frames of type UVC_VS_UNDEFINED in uvc_parse_formatEPSS 3.4%KEVCVE-2025-39682CRITICALtls: fix handling of zero-length records on the rx_listEPSS 3.3%KEVCVE-2024-36971HIGHnet: fix __dst_negative_advice() raceEPSS 2.7%KEVCVE-2025-39964HIGHcrypto: af_alg - Disallow concurrent writes in af_alg_sendmsgEPSS 1.6%KEV