CVE-2026-64252
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
In 64-bit configurations calling the initial console output handler from a kernel thread other than the initial one will result in a situation where the stack has been placed in the XKPHYS 64-bit memory segment and consequently so has been the buffer allocated there that is used as the argument corresponding to the `%s' output conversion specifier for the firmware's printf() entry point.
This 64-bit address will then be truncated by 32-bit firmware, resulting in an attempt to access the wrong memory location, which in turn will cause all kinds of unpredictable behaviour, such as a kernel crash:
Leer descripción completaMostrar menos
In this case the pointer in $4 was truncated from 0x980000000203bd00 to 0x000000000203bd00.
This may happen when no final console driver has been enabled in the configuration and consequently the initial console continues being used late into bootstrap or with an upcoming change that will switch the zs driver to use a platform device, which in turn will make the console handover happen only after other kernel threads have already been started.
Fix the issue by making the buffer static and initdata, and therefore placed in the CKSEG0 32-bit compatibility segment, observing that the console output handler is called with the console lock held, implying no need for this code to be reentrant. Add an assertion to verify the buffer actually has been placed in a compatibility segment.
Detalles técnicos trazas, registros y código del informe original
Console: colour dummy device 160x64
Calibrating delay loop... 49.36 BogoMIPS (lpj=192512)
pid_max: default: 32768 minimum: 301
CPU 0 Unable to handle kernel paging request at virtual address 000000000203bd00, epc == ffffffffbfc08364, ra == ffffffffbfc08800
Oops[#1]:
CPU: 0 PID: 0 Comm: swapper Not tainted 5.18.0-rc2-00254-gfb649bda6f56-dirty #121
$ 0 : 0000000000000000 0000000000000001 0000000000000023 ffffffff80684ba0
$ 4 : 000000000203bd00 ffffffffbfc0f3b4 ffffffffffffffff 0000000000000073
$ 8 : 0a303d7469000000 0000000000000000 0000000000000073 ffffffffbfc0f473
$12 : 0000000000000002 0000000000000000 ffffffff80684c1c 0000000000000000
$16 : 0000000000000000 ffffffff80596dc9 0000000000000000 ffffffffbfc09240
$20 : ffffffff80684c40 ffffffffbfc0f400 000000000000002d 000000000000002b
$24 : ffffffffffffffbf 000000000203bd00
$28 : ffffffff805f0000 ffffffff80684b58 0000000000000030 ffffffffbfc08800
Hi : 0000000000000000
Lo : 0000000000000aa8
epc : ffffffffbfc08364 0xffffffffbfc08364
ra : ffffffffbfc08800 0xffffffffbfc08800
Status: 140120e2 KX SX UX KERNEL EXL
Cause : 00000008 (ExcCode 02)
BadVA : 000000000203bd00
PrId : 00000430 (R4000SC)
Modules linked in:
Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)
Stack : 0000000000000000 0000000000000000 0000000000000000 0000004d0000004d
80684cc0806a2a40 80596dc80000004d 8061000000000000 bfc0850c80684c38
0000000000000000 000000000203bd00 0000000000000000 0000000000000000
0000000000000000 00000000bfc0f3b4 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000000000000000 0000000000000000 0000000000000000 0000000000000000
0000002500000000 0000000000000000 0000000000000000 802c1a7400000000
0203bd0080596dc8 0203bd4d69000000 6c61632000000018 5f746567646e6172
6c616320625f6d6f 5f736e5f6d6f7266 206361323778302b 303d74696e726320
806a0a38806b0000 806a0a38806b0000 00000000806b0000 80683c58806b0000
...
Call Trace:
Code: a082ffff 03e00008 00601021 <80820000> 00001821 10400005 24840001 80820000 24630001
---[ end trace 0000000000000000 ]---
Kernel panic - not syncing: Fatal exception in interrupt
KN04 V2.1k (PC: 0xa0026768, SP: 0x806848e8)
>>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/07c245bc39f94481fd75ff1ed54f7ab97111f3dd
- https://git.kernel.org/stable/c/1c80327dedf05b8c8ca025b76c21235b19dd3a86
- https://git.kernel.org/stable/c/35212f2adc2cf15122b96b987519de235b855e46
- https://git.kernel.org/stable/c/6e61fc2e06e44b6d30248cc5bc47a58e75c2b43e
- https://git.kernel.org/stable/c/7fb13fd35110ebe95eb053faf79d018f51144d85
- https://git.kernel.org/stable/c/8a15826e5d3bdcfbef2f8e9330c69ea9ee7282e7
- https://git.kernel.org/stable/c/9e22b6fc6532cd566dad6d89d8fb3885248e364a
- https://git.kernel.org/stable/c/ab465495b1ed5efb7d2f9b90d8b20b1e0473e26f
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-64252",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"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
}
]
},
"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": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "9e22b6fc6532cd566dad6d89d8fb3885248e364a",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "1c80327dedf05b8c8ca025b76c21235b19dd3a86",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "8a15826e5d3bdcfbef2f8e9330c69ea9ee7282e7",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "ab465495b1ed5efb7d2f9b90d8b20b1e0473e26f",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "35212f2adc2cf15122b96b987519de235b855e46",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "6e61fc2e06e44b6d30248cc5bc47a58e75c2b43e",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "07c245bc39f94481fd75ff1ed54f7ab97111f3dd",
"versionType": "git"
},
{
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"lessThan": "7fb13fd35110ebe95eb053faf79d018f51144d85",
"versionType": "git"
}
],
"programFiles": [
"arch/mips/dec/prom/console.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.38",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.3",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/mips/dec/prom/console.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-07-24T16:16:54.833",
"references": [
{
"url": "https://git.kernel.org/stable/c/07c245bc39f94481fd75ff1ed54f7ab97111f3dd",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/1c80327dedf05b8c8ca025b76c21235b19dd3a86",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/35212f2adc2cf15122b96b987519de235b855e46",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6e61fc2e06e44b6d30248cc5bc47a58e75c2b43e",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7fb13fd35110ebe95eb053faf79d018f51144d85",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8a15826e5d3bdcfbef2f8e9330c69ea9ee7282e7",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9e22b6fc6532cd566dad6d89d8fb3885248e364a",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ab465495b1ed5efb7d2f9b90d8b20b1e0473e26f",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"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\nMIPS: DEC: Prevent initial console buffer from landing in XKPHYS\n\nIn 64-bit configurations calling the initial console output handler from\na kernel thread other than the initial one will result in a situation\nwhere the stack has been placed in the XKPHYS 64-bit memory segment and\nconsequently so has been the buffer allocated there that is used as the\nargument corresponding to the `%s' output conversion specifier for the\nfirmware's printf() entry point.\n\nThis 64-bit address will then be truncated by 32-bit firmware, resulting\nin an attempt to access the wrong memory location, which in turn will\ncause all kinds of unpredictable behaviour, such as a kernel crash:\n\n Console: colour dummy device 160x64\n Calibrating delay loop... 49.36 BogoMIPS (lpj=192512)\n pid_max: default: 32768 minimum: 301\n CPU 0 Unable to handle kernel paging request at virtual address 000000000203bd00, epc == ffffffffbfc08364, ra == ffffffffbfc08800\n Oops[#1]:\n CPU: 0 PID: 0 Comm: swapper Not tainted 5.18.0-rc2-00254-gfb649bda6f56-dirty #121\n $ 0 : 0000000000000000 0000000000000001 0000000000000023 ffffffff80684ba0\n $ 4 : 000000000203bd00 ffffffffbfc0f3b4 ffffffffffffffff 0000000000000073\n $ 8 : 0a303d7469000000 0000000000000000 0000000000000073 ffffffffbfc0f473\n $12 : 0000000000000002 0000000000000000 ffffffff80684c1c 0000000000000000\n $16 : 0000000000000000 ffffffff80596dc9 0000000000000000 ffffffffbfc09240\n $20 : ffffffff80684c40 ffffffffbfc0f400 000000000000002d 000000000000002b\n $24 : ffffffffffffffbf 000000000203bd00\n $28 : ffffffff805f0000 ffffffff80684b58 0000000000000030 ffffffffbfc08800\n Hi : 0000000000000000\n Lo : 0000000000000aa8\n epc : ffffffffbfc08364 0xffffffffbfc08364\n ra : ffffffffbfc08800 0xffffffffbfc08800\n Status: 140120e2 KX SX UX KERNEL EXL\n Cause : 00000008 (ExcCode 02)\n BadVA : 000000000203bd00\n PrId : 00000430 (R4000SC)\n Modules linked in:\n Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)\n Stack : 0000000000000000 0000000000000000 0000000000000000 0000004d0000004d\n 80684cc0806a2a40 80596dc80000004d 8061000000000000 bfc0850c80684c38\n 0000000000000000 000000000203bd00 0000000000000000 0000000000000000\n 0000000000000000 00000000bfc0f3b4 0000000000000000 0000000000000000\n 0000000000000000 0000000000000000 0000000000000000 0000000000000000\n 0000000000000000 0000000000000000 0000000000000000 0000000000000000\n 0000002500000000 0000000000000000 0000000000000000 802c1a7400000000\n 0203bd0080596dc8 0203bd4d69000000 6c61632000000018 5f746567646e6172\n 6c616320625f6d6f 5f736e5f6d6f7266 206361323778302b 303d74696e726320\n 806a0a38806b0000 806a0a38806b0000 00000000806b0000 80683c58806b0000\n ...\n Call Trace:\n\n Code: a082ffff 03e00008 00601021 <80820000> 00001821 10400005 24840001 80820000 24630001\n\n ---[ end trace 0000000000000000 ]---\n Kernel panic - not syncing: Fatal exception in interrupt\n\n KN04 V2.1k (PC: 0xa0026768, SP: 0x806848e8)\n >>\n\nIn this case the pointer in $4 was truncated from 0x980000000203bd00 to\n0x000000000203bd00.\n\nThis may happen when no final console driver has been enabled in the\nconfiguration and consequently the initial console continues being used\nlate into bootstrap or with an upcoming change that will switch the zs\ndriver to use a platform device, which in turn will make the console\nhandover happen only after other kernel threads have already been\nstarted.\n\nFix the issue by making the buffer static and initdata, and therefore\nplaced in the CKSEG0 32-bit compatibility segment, observing that the\nconsole output handler is called with the console lock held, implying\nno need for this code to be reentrant. Add an assertion to verify the\nbuffer actually has been placed in a compatibility segment."
}
],
"lastModified": "2026-08-17T05:17:23.683",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0093C14A-7523-4D59-9391-BAD943E14053",
"versionEndExcluding": "5.10.260",
"versionStartIncluding": "2.6.12.1"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D71C101E-388C-4A46-BD99-49049F7C5CFF",
"versionEndExcluding": "5.15.211",
"versionStartIncluding": "5.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B",
"versionEndExcluding": "6.1.177",
"versionStartIncluding": "5.16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C8AD3BC8-C843-423C-B9DB-CB52F67F578E",
"versionEndExcluding": "6.6.144",
"versionStartIncluding": "6.2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4E206B86-E0E3-4394-A93F-39F2D50A8AA8",
"versionEndExcluding": "6.12.95",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "FA591B28-5D62-449E-BDBE-3C9391BF070A",
"versionEndExcluding": "6.18.38",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E",
"versionEndExcluding": "7.1.3",
"versionStartIncluding": "6.19"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6F62EECE-8FB1-4D57-85D8-CB9E23CF313C"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4F76C298-81DC-43E4-8FC9-DC005A2116EF"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0AB349B2-3F78-4197-882B-90ADB3BF645A"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6AC88830-A9BC-4607-B572-A4B502FC9FD0"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "476CB3A5-D022-4F13-AAEF-CB6A5785516A"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}