CVE-2026-43266
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
EFI/CPER: don't go past the ARM processor CPER record buffer
There's a logic inside GHES/CPER to detect if the section_length is too small, but it doesn't detect if it is too big.
Currently, if the firmware receives an ARM processor CPER record stating that a section length is big, kernel will blindly trust section_length, producing a very long dump. For instance, a 67 bytes record with ERR_INFO_NUM set 46198 and section length set to 854918320 would dump a lot of data going a way past the firmware memory-mapped area.
Fix it by adding a logic to prevent it to go past the buffer if ERR_INFO_NUM is too big, making it report instead:
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[ rjw: Subject and changelog tweaks ]
Detalles técnicos trazas, registros y código del informe original
[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1 [Hardware Error]: event severity: recoverable [Hardware Error]: Error 0, type: recoverable [Hardware Error]: section_type: ARM processor error [Hardware Error]: MIDR: 0xff304b2f8476870a [Hardware Error]: section length: 854918320, CPER size: 67 [Hardware Error]: section length is too big [Hardware Error]: firmware-generated error record is incorrect [Hardware Error]: ERR_INFO_NUM is 46198
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8
- https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095
- https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704
- https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0
- https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf
- https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8
- https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4
- https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't go past the ARM processor CPER record buffer\n\nThere's a logic inside GHES/CPER to detect if the section_length\nis too small, but it doesn't detect if it is too big.\n\nCurrently, if the firmware receives an ARM processor CPER record\nstating that a section length is big, kernel will blindly trust\nsection_length, producing a very long dump. For instance, a 67\nbytes record with ERR_INFO_NUM set 46198 and section length\nset to 854918320 would dump a lot of data going a way past the\nfirmware memory-mapped area.\n\nFix it by adding a logic to prevent it to go past the buffer\nif ERR_INFO_NUM is too big, making it report instead:\n\n\t[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1\n\t[Hardware Error]: event severity: recoverable\n\t[Hardware Error]: Error 0, type: recoverable\n\t[Hardware Error]: section_type: ARM processor error\n\t[Hardware Error]: MIDR: 0xff304b2f8476870a\n\t[Hardware Error]: section length: 854918320, CPER size: 67\n\t[Hardware Error]: section length is too big\n\t[Hardware Error]: firmware-generated error record is incorrect\n\t[Hardware Error]: ERR_INFO_NUM is 46198\n\n[ rjw: Subject and changelog tweaks ]"
}
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