Description
In the Linux kernel, the following vulnerability has been resolved: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once. This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.
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
32db401965f165f7c44447d0508097f070c8f576 to < 30bf5728bb217a6d1ba73f44094c9b9c6bc9a567affected32db401965f165f7c44447d0508097f070c8f576 to < 1d7864acd497cb468a998d44631f84896f885e85affected32db401965f165f7c44447d0508097f070c8f576 to < 93f616ff870a1fb7e84d472cad0af651b18f9f87affected0b99d0e17d6a73a0526f92bc6b54b2b95e67a31daffected6.10.11 to < 6.11affected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.12.44 to ≤ 6.12.*unaffected6.16.4 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected