{"id":"AZL-74610","summary":"CVE-2025-71125 affecting package kernel for versions less than 6.6.121.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Do not register unsupported perf events\n\nSynthetic events currently do not have a function to register perf events.\nThis leads to calling the tracepoint register functions with a NULL\nfunction pointer which triggers:\n\n ------------[ cut here ]------------\n WARNING: kernel/tracepoint.c:175 at tracepoint_add_func+0x357/0x370, CPU#2: perf/2272\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 2 UID: 0 PID: 2272 Comm: perf Not tainted 6.18.0-ftest-11964-ge022764176fc-dirty #323 PREEMPTLAZY\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\n RIP: 0010:tracepoint_add_func+0x357/0x370\n Code: 28 9c e8 4c 0b f5 ff eb 0f 4c 89 f7 48 c7 c6 80 4d 28 9c e8 ab 89 f4 ff 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc \u003c0f\u003e 0b 49 c7 c6 ea ff ff ff e9 ee fe ff ff 0f 0b e9 f9 fe ff ff 0f\n RSP: 0018:ffffabc0c44d3c40 EFLAGS: 00010246\n RAX: 0000000000000001 RBX: ffff9380aa9e4060 RCX: 0000000000000000\n RDX: 000000000000000a RSI: ffffffff9e1d4a98 RDI: ffff937fcf5fd6c8\n RBP: 0000000000000001 R08: 0000000000000007 R09: ffff937fcf5fc780\n R10: 0000000000000003 R11: ffffffff9c193910 R12: 000000000000000a\n R13: ffffffff9e1e5888 R14: 0000000000000000 R15: ffffabc0c44d3c78\n FS:  00007f6202f5f340(0000) GS:ffff93819f00f000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 000055d3162281a8 CR3: 0000000106a56003 CR4: 0000000000172ef0\n Call Trace:\n  \u003cTASK\u003e\n  tracepoint_probe_register+0x5d/0x90\n  synth_event_reg+0x3c/0x60\n  perf_trace_event_init+0x204/0x340\n  perf_trace_init+0x85/0xd0\n  perf_tp_event_init+0x2e/0x50\n  perf_try_init_event+0x6f/0x230\n  ? perf_event_alloc+0x4bb/0xdc0\n  perf_event_alloc+0x65a/0xdc0\n  __se_sys_perf_event_open+0x290/0x9f0\n  do_syscall_64+0x93/0x7b0\n  ? entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  ? trace_hardirqs_off+0x53/0xc0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nInstead, have the code return -ENODEV, which doesn't warn and has perf\nerror out with:\n\n # perf record -e synthetic:futex_wait\nError:\nThe sys_perf_event_open() syscall returned with 19 (No such device) for event (synthetic:futex_wait).\n\"dmesg | grep -i perf\" may provide additional information.\n\nIdeally perf should support synthetic events, but for now just fix the\nwarning. The support can come later.","modified":"2026-04-01T05:22:23.206208Z","published":"2026-01-14T15:16:02Z","upstream":["CVE-2025-71125"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71125"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.121.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-74610.json"}}],"schema_version":"1.7.5"}