CVE-2025-71197
Status: DeferredUnscored—
In the Linux kernel, the following vulnerability has been resolved:
w1: therm: Fix off-by-one buffer overflow in alarms_store
The sysfs buffer passed to alarms_store() is allocated with 'size + 1' bytes and a NUL terminator is appended. However, the 'size' argument does not account for this extra byte. The original code then allocated 'size' bytes and used strcpy() to copy 'buf', which always writes one byte past the allocated buffer since strcpy() copies until the NUL terminator at index 'size'.
Fix this by parsing the 'buf' parameter directly using simple_strtoll() without allocating any intermediate memory or string copying. This removes the overflow while simplifying the code.
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.23%
- Percentile among all scored CVEs: 12
- Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
- https://git.kernel.org/stable/c/060b08d72a38b158a7f850d4b83c17c2969e0f6b
- https://git.kernel.org/stable/c/49ff9b4b9deacbefa6654a0a2bcaf910c9de7e95
- https://git.kernel.org/stable/c/6a5820ecfa5a76c3d3e154802c8c15f391ef442e
- https://git.kernel.org/stable/c/6fd6d2a8e41b7f544a4d26cbd60bedf9c67893a0
- https://git.kernel.org/stable/c/761fcf46a1bd797bd32d23f3ea0141ffd437668a
- https://git.kernel.org/stable/c/b3fc3e1f04dcc7c41787bbf08a6e0d2728e022cf
- https://git.kernel.org/stable/c/e6b2609af21b5cccc9559339591b8a2cbf884169
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
Raw JSON (NVD)
Show
{
"id": "CVE-2025-71197",
"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": "e2c94d6f572079511945e64537eb1218643f2e68",
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"versionType": "git"
},
{
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"versionType": "git"
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{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
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"versionType": "git"
}
],
"programFiles": [
"drivers/w1/slaves/w1_therm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.249",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.199",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.162",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.122",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.68",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.8",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/w1/slaves/w1_therm.c"
],
"defaultStatus": "affected"
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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{
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"lessThan": "*",
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],
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},
{
"vendor": "Siemens",
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"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
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}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
}
]
}
],
"published": "2026-02-04T17:16:11.633",
"references": [
{
"url": "https://git.kernel.org/stable/c/060b08d72a38b158a7f850d4b83c17c2969e0f6b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/49ff9b4b9deacbefa6654a0a2bcaf910c9de7e95",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6a5820ecfa5a76c3d3e154802c8c15f391ef442e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6fd6d2a8e41b7f544a4d26cbd60bedf9c67893a0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/761fcf46a1bd797bd32d23f3ea0141ffd437668a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b3fc3e1f04dcc7c41787bbf08a6e0d2728e022cf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e6b2609af21b5cccc9559339591b8a2cbf884169",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nw1: therm: Fix off-by-one buffer overflow in alarms_store\n\nThe sysfs buffer passed to alarms_store() is allocated with 'size + 1'\nbytes and a NUL terminator is appended. However, the 'size' argument\ndoes not account for this extra byte. The original code then allocated\n'size' bytes and used strcpy() to copy 'buf', which always writes one\nbyte past the allocated buffer since strcpy() copies until the NUL\nterminator at index 'size'.\n\nFix this by parsing the 'buf' parameter directly using simple_strtoll()\nwithout allocating any intermediate memory or string copying. This\nremoves the overflow while simplifying the code."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nw1: therm: Corrección de desbordamiento de búfer por un byte en alarms_store\n\nEl búfer sysfs pasado a alarms_store() se asigna con 'size + 1' bytes y se añade un terminador NUL. Sin embargo, el argumento 'size' no tiene en cuenta este byte adicional. El código original entonces asignaba 'size' bytes y usaba strcpy() para copiar 'buf', lo que siempre escribe un byte más allá del búfer asignado ya que strcpy() copia hasta el terminador NUL en el índice 'size'.\n\nEsto se soluciona analizando el parámetro 'buf' directamente usando simple_strtoll() sin asignar ninguna memoria intermedia ni copiar cadenas. Esto elimina el desbordamiento mientras simplifica el código."
}
],
"lastModified": "2026-07-14T13:18:05.637",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}