{"id":"AZL-91322","summary":"CVE-2026-53285 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED\n\n[Why]\ndcn32_validate_bandwidth() wraps dcn32_internal_validate_bw() with\nDC_FP_START()/DC_FP_END(). In x86 non-RT, DC_FP_START takes fpregs_lock(),\nwhich disables local softirqs.\n\nThe DML1 path through dcn32_enable_phantom_plane() calls kvzalloc() to\nallocate ~335 KiB for dc_plane_state. This triggers the vmalloc path,\nwhich calls BUG_ON(in_interrupt()) because it's invoked within the\nFPU-enabled (softirq disabled) region, leading to a kernel crash.\n\n[How]\nWrap the dc_state_create_phantom_plane() call with the\nDC_RUN_WITH_PREEMPTION_ENABLED() macro to allow preemption during\nthis memory allocation.\n\n(cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)","modified":"2026-08-30T05:26:50Z","published":"2026-06-26T20:17:21Z","upstream":["CVE-2026-53285"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53285"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-91322.json"}}],"schema_version":"1.9.0"}