Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 55779f26eab9af12474a447001bd17070f055712 before f02f0218be412cff1c844addf58e002071be298b; affected c6ab5c915da460c0397960af3c308386c3f3247b before f2133b849ff273abddb6da622daddd8f6f6fa448; affected c6ab5c915da460c0397960af3c308386c3f3247b before 921b8167f10708e38080f84e195cdc68a7a561f1; affected c6ab5c915da460c0397960af3c308386c3f3247b before b16510a530d1e6ab9683f04f8fb34f2e0f538275; affected 6.6.70 before 6.6.99 |
| Linux / Linux | affected 6.10; unaffected 0 before 6.10; unaffected 6.6.99 through 6.6.*; unaffected 6.12.39 through 6.12.*; unaffected 6.14.5 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f02f0218be412cff1c844addf58e002071be298b
- https://git.kernel.org/stable/c/f2133b849ff273abddb6da622daddd8f6f6fa448
- https://git.kernel.org/stable/c/921b8167f10708e38080f84e195cdc68a7a561f1
- https://git.kernel.org/stable/c/b16510a530d1e6ab9683f04f8fb34f2e0f538275
ADP enrichment
No English description supplied.
No references supplied.