w1: therm: Fix off-by-one buffer overflow in alarms_store
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.
CVE-2025-71197
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-71197
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "49ff9b4b9deacbefa6654a0a2bcaf910c9de7e95",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "060b08d72a38b158a7f850d4b83c17c2969e0f6b",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "b3fc3e1f04dcc7c41787bbf08a6e0d2728e022cf",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "6a5820ecfa5a76c3d3e154802c8c15f391ef442e",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "6fd6d2a8e41b7f544a4d26cbd60bedf9c67893a0",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "e6b2609af21b5cccc9559339591b8a2cbf884169",
"versionType": "git"
},
{
"status": "affected",
"version": "e2c94d6f572079511945e64537eb1218643f2e68",
"lessThan": "761fcf46a1bd797bd32d23f3ea0141ffd437668a",
"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"
}
]- Related CVEs
- CVE-2025-71197
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27149 · Revision 1
- Added to Heist Feed
- Publisher date