{"id":"CVE-2025-22094","summary":"powerpc/perf: Fix ref-counting on the PMU 'vpa_pmu'","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/perf: Fix ref-counting on the PMU 'vpa_pmu'\n\nCommit 176cda0619b6 (\"powerpc/perf: Add perf interface to expose vpa\ncounters\") introduced 'vpa_pmu' to expose Book3s-HV nested APIv2 provided\nL1\u003c-\u003eL2 context switch latency counters to L1 user-space via\nperf-events. However the newly introduced PMU named 'vpa_pmu' doesn't\nassign ownership of the PMU to the module 'vpa_pmu'. Consequently the\nmodule 'vpa_pmu' can be unloaded while one of the perf-events are still\nactive, which can lead to kernel oops and panic of the form below on a\nPseries-LPAR:\n\nBUG: Kernel NULL pointer dereference on read at 0x00000058\n\u003csnip\u003e\n NIP [c000000000506cb8] event_sched_out+0x40/0x258\n LR [c00000000050e8a4] __perf_remove_from_context+0x7c/0x2b0\n Call Trace:\n [c00000025fc3fc30] [c00000025f8457a8] 0xc00000025f8457a8 (unreliable)\n [c00000025fc3fc80] [fffffffffffffee0] 0xfffffffffffffee0\n [c00000025fc3fcd0] [c000000000501e70] event_function+0xa8/0x120\n\u003csnip\u003e\n Kernel panic - not syncing: Aiee, killing interrupt handler!\n\nFix this by adding the module ownership to 'vpa_pmu' so that the module\n'vpa_pmu' is ref-counted and prevented from being unloaded when perf-events\nare initialized.","modified":"2026-04-02T12:45:20.712425Z","published":"2025-04-16T14:12:45.512Z","related":["SUSE-SU-2025:01951-1","SUSE-SU-2025:01967-1","SUSE-SU-2025:01972-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22094.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6cf045b51e2c5721db7e55305f09ee32741e00f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70ea7c5189197c6f5acdcfd8a2651be2c41e2faa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ff99d5b6a246715f2257123cdf6c4a29cb33aa78"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22094.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-22094"},{"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":"176cda0619b6c17a553625f6e2fcbc3981ad667d"},{"fixed":"70ea7c5189197c6f5acdcfd8a2651be2c41e2faa"},{"fixed":"6cf045b51e2c5721db7e55305f09ee32741e00f9"},{"fixed":"ff99d5b6a246715f2257123cdf6c4a29cb33aa78"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22094.json"}}],"schema_version":"1.7.5"}