CVE-2026-53090

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix ld_{abs,ind} failure path analysis in subprogs

Usage of ld_{abs,ind} instructions got extended into subprogs some time ago via commit 09b28d76eac4 ("bpf: Add abnormal return checks."). These are only allowed in subprograms when the latter are BTF annotated and have scalar return types.

The code generator in bpf_gen_ld_abs() has an abnormal exit path (r0=0 + exit) from legacy cBPF times. While the enforcement is on scalar return types, the verifier must also simulate the path of abnormal exit if the packet data load via ld_{abs,ind} failed.

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This is currently not the case. Fix it by having the verifier simulate both success and failure paths, and extend it in similar ways as we do for tail calls. The success path (r0=unknown, continue to next insn) is pushed onto stack for later validation and the r0=0 and return to the caller is done on the fall-through side.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.14%
Percentil entre todas las CVEs puntuadas: 3
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %
Impacto secundarioT1499.004 Application or System Exploitationimpact60 %

Vulnerabilidad local (AV:L) sin interacción (UI:N) en kernel Linux que permite escalada de privilegios mediante ld_abs/ld_ind en subprogramas eBPF; impacto en ejecución de código con privilegios elevados.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo
CWE-253

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix ld_{abs,ind} failure path analysis in subprogs\n\nUsage of ld_{abs,ind} instructions got extended into subprogs some time\nago via commit 09b28d76eac4 (\"bpf: Add abnormal return checks.\"). These\nare only allowed in subprograms when the latter are BTF annotated and\nhave scalar return types.\n\nThe code generator in bpf_gen_ld_abs() has an abnormal exit path (r0=0 +\nexit) from legacy cBPF times. While the enforcement is on scalar return\ntypes, the verifier must also simulate the path of abnormal exit if the\npacket data load via ld_{abs,ind} failed.\n\nThis is currently not the case. Fix it by having the verifier simulate\nboth success and failure paths, and extend it in similar ways as we do\nfor tail calls. The success path (r0=unknown, continue to next insn) is\npushed onto stack for later validation and the r0=0 and return to the\ncaller is done on the fall-through side."
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