Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing The zcrypt_msgtype6_send_ep11_cprb() function uses fragile struct overlays to access and modify the domain field in the EP11 CPRB payload, creating maintainability and security concerns: 1. Struct overlay approach (pld_hdr) assumes fixed payload structure and doesn't validate the actual ASN.1 encoding. 2. Complex length format detection logic is error-prone and doesn't properly validate bounds at each parsing step. 3. Direct struct member access bypasses proper ASN.1 validation. Fix by replacing struct overlays with explicit ASN.1 parsing that validates each field (payload tag/length, function tag/length/value, optional domain tag/length/value) with proper bounds checking at every step. Add asn1_int_encode() helper function to safely write integer values with correct endianness conversion. This makes the code consistent with the validation pattern introduced with the rework of the xcrb_msg_to_type6_ep11cprb_msgx() function.
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 < 00a44ff06bcffb68b9cd7e90d2259b7d14b82b18affectede2c6d91eb8b1533753755f07803e47eceed263d0 to < db21b2cf6dd0af5ffd08931e0a9fcda5a0473220affectede2c6d91eb8b1533753755f07803e47eceed263d0 to < 0864a163783bff109b548266921829ea794edc93affectedf9da85d4780515f65983e0af151458599adaef3daffected6.12.114 to < 6.13affected
Linux Linux
Default version status: affected
7.1affected0 to < 7.1unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected