crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()
In the Linux kernel, the following vulnerability has been resolved: crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP() Herbert notes that DIV_ROUND_UP() may overflow unnecessarily if an ecdsa implementation's ->key_size() callback returns an unusually large value. Herbert instead suggests (for a division by 8): X / 8 + !!(X & 7) Based on this formula, introduce a generic DIV_ROUND_UP_POW2() macro and use it in lieu of DIV_ROUND_UP() for ->key_size() return values. Additionally, use the macro in ecc_digits_from_bytes(), whose "nbytes" parameter is a ->key_size() return value in some instances, or a user-specified ASN.1 length in the case of ecdsa_get_signature_rs().
CVE-2025-37984
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-2025-37984
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": "55779f26eab9af12474a447001bd17070f055712",
"lessThan": "f02f0218be412cff1c844addf58e002071be298b",
"versionType": "git"
},
{
"status": "affected",
"version": "c6ab5c915da460c0397960af3c308386c3f3247b",
"lessThan": "f2133b849ff273abddb6da622daddd8f6f6fa448",
"versionType": "git"
},
{
"status": "affected",
"version": "c6ab5c915da460c0397960af3c308386c3f3247b",
"lessThan": "921b8167f10708e38080f84e195cdc68a7a561f1",
"versionType": "git"
},
{
"status": "affected",
"version": "c6ab5c915da460c0397960af3c308386c3f3247b",
"lessThan": "b16510a530d1e6ab9683f04f8fb34f2e0f538275",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.70",
"lessThan": "6.6.99",
"versionType": "semver"
}
],
"programFiles": [
"crypto/ecc.c",
"crypto/ecdsa-p1363.c",
"crypto/ecdsa-x962.c",
"include/linux/math.h"
],
"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": "6.6.99",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.39",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.14.5",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"crypto/ecc.c",
"crypto/ecdsa-p1363.c",
"crypto/ecdsa-x962.c",
"include/linux/math.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-37984
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30502 · Revision 1
- Added to Heist Feed
- Publisher date