Skip to content
CVE PROGRAM SOURCE RECORD7.0 High

CVE-2025-37984

crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 55779f26eab9af12474a447001bd17070f055712 to < f02f0218be412cff1c844addf58e002071be298baffected
  • c6ab5c915da460c0397960af3c308386c3f3247b to < f2133b849ff273abddb6da622daddd8f6f6fa448affected
  • c6ab5c915da460c0397960af3c308386c3f3247b to < 921b8167f10708e38080f84e195cdc68a7a561f1affected
  • c6ab5c915da460c0397960af3c308386c3f3247b to < b16510a530d1e6ab9683f04f8fb34f2e0f538275affected
  • 6.6.70 to < 6.6.99affected

Linux Linux

Default version status: affected

  • 6.10affected
  • 0 to < 6.10unaffected
  • 6.6.99 to ≤ 6.6.*unaffected
  • 6.12.39 to ≤ 6.12.*unaffected
  • 6.14.5 to ≤ 6.14.*unaffected
  • 6.15 to ≤ *unaffected

References