CVE-2025-40008
Estado: AplazadaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
kmsan: fix out-of-bounds access to shadow memory
Running sha224_kunit on a KMSAN-enabled kernel results in a crash in kmsan_internal_set_shadow_origin():
This occurs when memset() is called on a buffer that is not 4-byte aligned and extends to the end of a guard page, i.e. the next page is unmapped.
The bug is that the loop at the end of kmsan_internal_set_shadow_origin() accesses the wrong shadow memory bytes when the address is not 4-byte aligned.
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Since each 4 bytes are associated with an origin, it rounds the address and size so that it can access all the origins that contain the buffer. However, when it checks the corresponding shadow bytes for a particular origin, it incorrectly uses the original unrounded shadow address. This results in reads from shadow memory beyond the end of the buffer's shadow memory, which crashes when that memory is not mapped.
To fix this, correctly align the shadow address before accessing the 4 shadow bytes corresponding to each origin.
Detalles técnicos trazas, registros y código del informe original
BUG: unable to handle page fault for address: ffffbc3840291000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G N 6.17.0-rc3 #10 PREEMPT(voluntary)
Tainted: [N]=TEST
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100
[...]
Call Trace:
<TASK>
__msan_memset+0xee/0x1a0
sha224_final+0x9e/0x350
test_hash_buffer_overruns+0x46f/0x5f0
? kmsan_get_shadow_origin_ptr+0x46/0xa0
? __pfx_test_hash_buffer_overruns+0x10/0x10
kunit_try_run_case+0x198/0xa00CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.25%
- Percentil entre todas las CVEs puntuadas: 14
- 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)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/5855792c6bb9a825607845db3feaddaff0414ec3
- https://git.kernel.org/stable/c/85e1ff61060a765d91ee62dc5606d4d547d9d105
- https://git.kernel.org/stable/c/df1fa034c0fc229a63d01ffb20bb919b839cb576
- https://git.kernel.org/stable/c/e6684ed39edc35401a3341f85b1ab50a6f89a45d
- https://git.kernel.org/stable/c/f84e48707051812289b6c2684d4df2daa9d3bfbc
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-40008",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9ff078f5bad8990091f1639347de5e02636e9536",
"lessThan": "e6684ed39edc35401a3341f85b1ab50a6f89a45d",
"versionType": "git"
},
{
"status": "affected",
"version": "19e85d939001946671643f4c16e1de8c633a6ce0",
"lessThan": "df1fa034c0fc229a63d01ffb20bb919b839cb576",
"versionType": "git"
},
{
"status": "affected",
"version": "2ef3cec44c60ae171b287db7fc2aa341586d65ba",
"lessThan": "f84e48707051812289b6c2684d4df2daa9d3bfbc",
"versionType": "git"
},
{
"status": "affected",
"version": "2ef3cec44c60ae171b287db7fc2aa341586d65ba",
"lessThan": "5855792c6bb9a825607845db3feaddaff0414ec3",
"versionType": "git"
},
{
"status": "affected",
"version": "2ef3cec44c60ae171b287db7fc2aa341586d65ba",
"lessThan": "85e1ff61060a765d91ee62dc5606d4d547d9d105",
"versionType": "git"
},
{
"status": "affected",
"version": "abeede7011da6c88e83ed260b909c140b8c9c250",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.94",
"lessThan": "6.1.155",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.34",
"lessThan": "6.6.109",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.9.5",
"lessThan": "6.10",
"versionType": "semver"
}
],
"programFiles": [
"mm/kmsan/core.c",
"mm/kmsan/kmsan_test.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.155",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.109",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.50",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.10",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"mm/kmsan/core.c",
"mm/kmsan/kmsan_test.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-10-20T16:15:37.480",
"references": [
{
"url": "https://git.kernel.org/stable/c/5855792c6bb9a825607845db3feaddaff0414ec3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/85e1ff61060a765d91ee62dc5606d4d547d9d105",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/df1fa034c0fc229a63d01ffb20bb919b839cb576",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e6684ed39edc35401a3341f85b1ab50a6f89a45d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f84e48707051812289b6c2684d4df2daa9d3bfbc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkmsan: fix out-of-bounds access to shadow memory\n\nRunning sha224_kunit on a KMSAN-enabled kernel results in a crash in\nkmsan_internal_set_shadow_origin():\n\n BUG: unable to handle page fault for address: ffffbc3840291000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0\n Oops: 0000 [#1] SMP NOPTI\n CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G N 6.17.0-rc3 #10 PREEMPT(voluntary)\n Tainted: [N]=TEST\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100\n [...]\n Call Trace:\n <TASK>\n __msan_memset+0xee/0x1a0\n sha224_final+0x9e/0x350\n test_hash_buffer_overruns+0x46f/0x5f0\n ? kmsan_get_shadow_origin_ptr+0x46/0xa0\n ? __pfx_test_hash_buffer_overruns+0x10/0x10\n kunit_try_run_case+0x198/0xa00\n\nThis occurs when memset() is called on a buffer that is not 4-byte aligned\nand extends to the end of a guard page, i.e. the next page is unmapped.\n\nThe bug is that the loop at the end of kmsan_internal_set_shadow_origin()\naccesses the wrong shadow memory bytes when the address is not 4-byte\naligned. Since each 4 bytes are associated with an origin, it rounds the\naddress and size so that it can access all the origins that contain the\nbuffer. However, when it checks the corresponding shadow bytes for a\nparticular origin, it incorrectly uses the original unrounded shadow\naddress. This results in reads from shadow memory beyond the end of the\nbuffer's shadow memory, which crashes when that memory is not mapped.\n\nTo fix this, correctly align the shadow address before accessing the 4\nshadow bytes corresponding to each origin."
}
],
"lastModified": "2026-06-17T09:21:06.730",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}