{"id":"CVE-2023-54278","summary":"s390/vmem: split pages when debug pagealloc is enabled","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vmem: split pages when debug pagealloc is enabled\n\nSince commit bb1520d581a3 (\"s390/mm: start kernel with DAT enabled\")\nthe kernel crashes early during boot when debug pagealloc is enabled:\n\nmem auto-init: stack:off, heap alloc:off, heap free:off\naddressing exception: 0005 ilc:2 [#1] SMP DEBUG_PAGEALLOC\nModules linked in:\nCPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0-rc3-09759-gc5666c912155 #630\n[..]\nKrnl Code: 00000000001325f6: ec5600248064 cgrj %r5,%r6,8,000000000013263e\n           00000000001325fc: eb880002000c srlg %r8,%r8,2\n          #0000000000132602: b2210051     ipte %r5,%r1,%r0,0\n          \u003e0000000000132606: b90400d1     lgr %r13,%r1\n           000000000013260a: 41605008     la %r6,8(%r5)\n           000000000013260e: a7db1000     aghi %r13,4096\n           0000000000132612: b221006d     ipte %r6,%r13,%r0,0\n           0000000000132616: e3d0d0000171 lay %r13,4096(%r13)\n\nCall Trace:\n __kernel_map_pages+0x14e/0x320\n __free_pages_ok+0x23a/0x5a8)\n free_low_memory_core_early+0x214/0x2c8\n memblock_free_all+0x28/0x58\n mem_init+0xb6/0x228\n mm_core_init+0xb6/0x3b0\n start_kernel+0x1d2/0x5a8\n startup_continue+0x36/0x40\nKernel panic - not syncing: Fatal exception: panic_on_oops\n\nThis is caused by using large mappings on machines with EDAT1/EDAT2. Add\nthe code to split the mappings into 4k pages if debug pagealloc is enabled\nby CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT or the debug_pagealloc kernel\ncommand line option.","modified":"2026-04-02T09:45:44.626723Z","published":"2025-12-30T12:16:06.350Z","related":["SUSE-SU-2026:0278-1","SUSE-SU-2026:0281-1","SUSE-SU-2026:0293-1","SUSE-SU-2026:0315-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54278.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/601e467e29a960f7ab7ec4075afc6a68c3532a65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/edc1e4b6e26536868ef819a735e04a5b32c10589"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54278.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54278"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bb1520d581a3a46e2d6e12bb74604ace33404de5"},{"fixed":"601e467e29a960f7ab7ec4075afc6a68c3532a65"},{"fixed":"edc1e4b6e26536868ef819a735e04a5b32c10589"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54278.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.3.0"},{"fixed":"6.4.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54278.json"}}],"schema_version":"1.7.5"}