CVE-2025-71125: tracing: Do not register unsupported perf events
In the Linux kernel, the following vulnerability has been resolved:
tracing: Do not register unsupported perf events
Synthetic events currently do not have a function to register perf events. This leads to calling the tracepoint register functions with a NULL function pointer which triggers:
------------[ cut here ]------------ WARNING: kernel/tracepoint.c:175 at tracepointaddfunc+0x357/0x370, CPU#2: perf/2272 Modules linked in: kvmintel kvm irqbypass CPU: 2 UID: 0 PID: 2272 Comm: perf Not tainted 6.18.0-ftest-11964-ge022764176fc-dirty #323 PREEMPTLAZY Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:tracepointaddfunc+0x357/0x370 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 <0f> 0b 49 c7 c6 ea ff ff ff e9 ee fe ff ff 0f 0b e9 f9 fe ff ff 0f RSP: 0018:ffffabc0c44d3c40 EFLAGS: 00010246 RAX: 0000000000000001 RBX: ffff9380aa9e4060 RCX: 0000000000000000 RDX: 000000000000000a RSI: ffffffff9e1d4a98 RDI: ffff937fcf5fd6c8 RBP: 0000000000000001 R08: 0000000000000007 R09: ffff937fcf5fc780 R10: 0000000000000003 R11: ffffffff9c193910 R12: 000000000000000a R13: ffffffff9e1e5888 R14: 0000000000000000 R15: ffffabc0c44d3c78 FS: 00007f6202f5f340(0000) GS:ffff93819f00f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d3162281a8 CR3: 0000000106a56003 CR4: 0000000000172ef0 Call Trace: <TASK> tracepointproberegister+0x5d/0x90 syntheventreg+0x3c/0x60 perftraceeventinit+0x204/0x340 perftraceinit+0x85/0xd0 perftpeventinit+0x2e/0x50 perftryinitevent+0x6f/0x230 ? perfeventalloc+0x4bb/0xdc0 perfeventalloc+0x65a/0xdc0 sesysperfeventopen+0x290/0x9f0 dosyscall64+0x93/0x7b0 ? entrySYSCALL64afterhwframe+0x76/0x7e ? tracehardirqsoff+0x53/0xc0 entrySYSCALL64afterhwframe+0x76/0x7e
Instead, have the code return -ENODEV, which doesn't warn and has perf error out with:
# perf record -e synthetic:futexwait Error: The sysperfeventopen() syscall returned with 19 (No such device) for event (synthetic:futexwait). "dmesg | grep -i perf" may provide additional information.
Ideally perf should support synthetic events, but for now just fix the warning. The support can come later.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-71125?
CVE-2025-71125 has not been assigned a severity rating at this time.
How do I fix CVE-2025-71125?
To fix CVE-2025-71125, you should update the Linux kernel to the latest version where this vulnerability is resolved.
What versions of the Linux Kernel are affected by CVE-2025-71125?
CVE-2025-71125 affects versions of the Linux kernel prior to 6.18.0-ftest-11964-ge022764176fc.
What is the nature of the vulnerability in CVE-2025-71125?
CVE-2025-71125 involves the incorrect registration of unsupported perf events in the tracing functions of the Linux kernel.
Is CVE-2025-71125 a critical vulnerability?
The criticality of CVE-2025-71125 is currently undetermined and depends on specific exploit scenarios.