Description
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 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
20b0b0159390fa5c00a435195649680fefda81e0 to < 584400144020f40365de3972c4763da520e7280eaffectede2c6d91eb8b1533753755f07803e47eceed263d0 to < 50fe5133dcb46449daf2435fa705264364411129affectede2c6d91eb8b1533753755f07803e47eceed263d0 to < 35ac6754ba6da45fd193f5ce3f665f7490b830d5affectedf9da85d4780515f65983e0af151458599adaef3daffected6.12.114 to < 6.13affected
Linux Linux
Default version status: affected
7.1affected0 to < 7.1unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected