Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve CCA CPRB length and overflow checks The xcrb_msg_to_type6cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Integer overflow after CEIL4 alignment: Signed int variables could overflow during 4-byte boundary alignment, causing undersized buffer allocations or incorrect bounds checking. 2. Missing minimum size validation: The CPRBX structure is copied from userspace without verifying sufficient buffer length. Undersized buffers cause uninitialized memory access when reading structure fields like cprbx.cprb_len and cprbx.domain. 3. Arithmetic overflow in sum calculations: Adding control block and data block sizes could overflow, bypassing size checks and enabling buffer overflows. Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, validating minimum control block size before copying from userspace, and detecting sum calculation overflows.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 20b0b0159390fa5c00a435195649680fefda81e0 before 584400144020f40365de3972c4763da520e7280e; affected e2c6d91eb8b1533753755f07803e47eceed263d0 before 50fe5133dcb46449daf2435fa705264364411129; affected e2c6d91eb8b1533753755f07803e47eceed263d0 before 35ac6754ba6da45fd193f5ce3f665f7490b830d5; affected f9da85d4780515f65983e0af151458599adaef3d; affected 6.12.114 before 6.13 |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.