Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve EP11 CPRB length and overflow checks The xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input validation, creating security vulnerabilities: 1. Missing minimum size validation: The ep11_cprb structure and subsequent payload fields (pld_tag, pld_lenfmt) are copied from userspace without verifying sufficient buffer length. 2. Arithmetic overflow in length calculations: CEIL4 alignment could overflow, bypassing size checks and enabling buffer overflows. 3. The payload is asn1 encoded but the function just uses a simple c struct overlay to access some fields of the payload. Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, and validating minimum request size and minimum reply size before copying from userspace. Do a very simple asn1 parsing of the payload up to the function value field.
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 < f463f474773aa49ed1d6087d95d44cea7099fdc7affectede2c6d91eb8b1533753755f07803e47eceed263d0 to < 2976b9d2e716c7e5487ca7c29a7bd076cf9adf08affectede2c6d91eb8b1533753755f07803e47eceed263d0 to < 17ac0bc866fc624cd05f022dcd8b730c0af11bb1affectedf9da85d4780515f65983e0af151458599adaef3daffected6.12.114 to < 6.13affected
Linux Linux
Default version status: affected
7.1affected0 to < 7.1unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected