Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 20b0b0159390fa5c00a435195649680fefda81e0 before f463f474773aa49ed1d6087d95d44cea7099fdc7; affected e2c6d91eb8b1533753755f07803e47eceed263d0 before 2976b9d2e716c7e5487ca7c29a7bd076cf9adf08; affected e2c6d91eb8b1533753755f07803e47eceed263d0 before 17ac0bc866fc624cd05f022dcd8b730c0af11bb1; 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.