CVE-2026-43277
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
APEI/GHES: ensure that won't go past CPER allocated record
The logic at ghes_new() prevents allocating too large records, by checking if they're bigger than GHES_ESTATUS_MAX_SIZE (currently, 64KB). Yet, the allocation is done with the actual number of pages from the CPER bios table location, which can be smaller.
Yet, a bad firmware could send data with a different size, which might be bigger than the allocated memory, causing an OOPS:
Prevent that by taking the actual allocated are into account when checking for CPER length.
[ rjw: Subject tweaks ]
Detalles técnicos trazas, registros y código del informe original
Unable to handle kernel paging request at virtual address fff00000f9b40000
Mem abort info:
ESR = 0x0000000096000007
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x07: level 3 translation fault
Data abort info:
ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 52-bit VAs, pgdp=000000008ba16000
[fff00000f9b40000] pgd=180000013ffff403, p4d=180000013fffe403, pud=180000013f85b403, pmd=180000013f68d403, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] SMP
Modules linked in:
CPU: 0 UID: 0 PID: 303 Comm: kworker/0:1 Not tainted 6.19.0-rc1-00002-gda407d200220 #34 PREEMPT
Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022
Workqueue: kacpi_notify acpi_os_execute_deferred
pstate: 214020c5 (nzCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : hex_dump_to_buffer+0x30c/0x4a0
lr : hex_dump_to_buffer+0x328/0x4a0
sp : ffff800080e13880
x29: ffff800080e13880 x28: ffffac9aba86f6a8 x27: 0000000000000083
x26: fff00000f9b3fffc x25: 0000000000000004 x24: 0000000000000004
x23: ffff800080e13905 x22: 0000000000000010 x21: 0000000000000083
x20: 0000000000000001 x19: 0000000000000008 x18: 0000000000000010
x17: 0000000000000001 x16: 00000007c7f20fec x15: 0000000000000020
x14: 0000000000000008 x13: 0000000000081020 x12: 0000000000000008
x11: ffff800080e13905 x10: ffff800080e13988 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000020
x5 : 0000000000000030 x4 : 00000000fffffffe x3 : 0000000000000000
x2 : ffffac9aba78c1c8 x1 : ffffac9aba76d0a8 x0 : 0000000000000008
Call trace:
hex_dump_to_buffer+0x30c/0x4a0 (P)
print_hex_dump+0xac/0x170
cper_estatus_print_section+0x90c/0x968
cper_estatus_print+0xf0/0x158
__ghes_print_estatus+0xa0/0x148
ghes_proc+0x1bc/0x220
ghes_notify_hed+0x5c/0xb8
notifier_call_chain+0x78/0x148
blocking_notifier_call_chain+0x4c/0x80
acpi_hed_notify+0x28/0x40
acpi_ev_notify_dispatch+0x50/0x80
acpi_os_execute_deferred+0x24/0x48
process_one_work+0x15c/0x3b0
worker_thread+0x2d0/0x400
kthread+0x148/0x228
ret_from_fork+0x10/0x20
Code: 6b14033f 540001ad a94707e2 f100029f (b8747b44)
---[ end trace 0000000000000000 ]---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: 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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/616c120dcdf1ce96edcd818e38bce49667f80689
- https://git.kernel.org/stable/c/6f5d41984ad896736c23e2fff7c80e15c1319132
- https://git.kernel.org/stable/c/92ba79074c58e65a6e32713758c5a9aecd33c2ea
- https://git.kernel.org/stable/c/98bd9b28d4d11e6739ad86524b4be4ada9025e60
- https://git.kernel.org/stable/c/b6be51a12441136fdf8c49b2525689fbea1856e1
- https://git.kernel.org/stable/c/e0ec99115e135dbb58e11a0df007c7d4771d4a17
- https://git.kernel.org/stable/c/f3740a1562445f36f08afab8af59e37117b3acdc
- https://git.kernel.org/stable/c/fa2408a24f8f0db14d9cfc613ef162dc267d7ad4
JSON original (NVD)
Mostrar
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"id": "CVE-2026-43277",
"cveTags": [],
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"source": "nvd@nist.gov",
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"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
]
},
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{
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"published": "2026-05-06T12:16:49.057",
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{
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"tags": [
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"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nAPEI/GHES: ensure that won't go past CPER allocated record\n\nThe logic at ghes_new() prevents allocating too large records, by\nchecking if they're bigger than GHES_ESTATUS_MAX_SIZE (currently, 64KB).\nYet, the allocation is done with the actual number of pages from the\nCPER bios table location, which can be smaller.\n\nYet, a bad firmware could send data with a different size, which might\nbe bigger than the allocated memory, causing an OOPS:\n\n Unable to handle kernel paging request at virtual address fff00000f9b40000\n Mem abort info:\n ESR = 0x0000000096000007\n EC = 0x25: DABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x07: level 3 translation fault\n Data abort info:\n ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000\n CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n swapper pgtable: 4k pages, 52-bit VAs, pgdp=000000008ba16000\n [fff00000f9b40000] pgd=180000013ffff403, p4d=180000013fffe403, pud=180000013f85b403, pmd=180000013f68d403, pte=0000000000000000\n Internal error: Oops: 0000000096000007 [#1] SMP\n Modules linked in:\n CPU: 0 UID: 0 PID: 303 Comm: kworker/0:1 Not tainted 6.19.0-rc1-00002-gda407d200220 #34 PREEMPT\n Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 02/02/2022\n Workqueue: kacpi_notify acpi_os_execute_deferred\n pstate: 214020c5 (nzCv daIF +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n pc : hex_dump_to_buffer+0x30c/0x4a0\n lr : hex_dump_to_buffer+0x328/0x4a0\n sp : ffff800080e13880\n x29: ffff800080e13880 x28: ffffac9aba86f6a8 x27: 0000000000000083\n x26: fff00000f9b3fffc x25: 0000000000000004 x24: 0000000000000004\n x23: ffff800080e13905 x22: 0000000000000010 x21: 0000000000000083\n x20: 0000000000000001 x19: 0000000000000008 x18: 0000000000000010\n x17: 0000000000000001 x16: 00000007c7f20fec x15: 0000000000000020\n x14: 0000000000000008 x13: 0000000000081020 x12: 0000000000000008\n x11: ffff800080e13905 x10: ffff800080e13988 x9 : 0000000000000000\n x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000020\n x5 : 0000000000000030 x4 : 00000000fffffffe x3 : 0000000000000000\n x2 : ffffac9aba78c1c8 x1 : ffffac9aba76d0a8 x0 : 0000000000000008\n Call trace:\n hex_dump_to_buffer+0x30c/0x4a0 (P)\n print_hex_dump+0xac/0x170\n cper_estatus_print_section+0x90c/0x968\n cper_estatus_print+0xf0/0x158\n __ghes_print_estatus+0xa0/0x148\n ghes_proc+0x1bc/0x220\n ghes_notify_hed+0x5c/0xb8\n notifier_call_chain+0x78/0x148\n blocking_notifier_call_chain+0x4c/0x80\n acpi_hed_notify+0x28/0x40\n acpi_ev_notify_dispatch+0x50/0x80\n acpi_os_execute_deferred+0x24/0x48\n process_one_work+0x15c/0x3b0\n worker_thread+0x2d0/0x400\n kthread+0x148/0x228\n ret_from_fork+0x10/0x20\n Code: 6b14033f 540001ad a94707e2 f100029f (b8747b44)\n ---[ end trace 0000000000000000 ]---\n\nPrevent that by taking the actual allocated are into account when\nchecking for CPER length.\n\n[ rjw: Subject tweaks ]"
}
],
"lastModified": "2026-06-17T10:49:17.690",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
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}