{"cve":"CVE-2023-52839","nvd":{"published":"2024-05-21T16:15:21.310","modified":"2026-06-17T06:43:42.177","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: perf: Do not broadcast to other cpus when starting a counter\n\nThis command:\n\n$ perf record -e cycles:k -e instructions:k -c 10000 -m 64M dd if=/dev/zero of=/dev/null count=1000\n\ngives rise to this kernel warning:\n\n[  444.364395] WARNING: CPU: 0 PID: 104 at kernel/smp.c:775 smp_call_function_many_cond+0x42c/0x436\n[  444.364515] Modules linked in:\n[  444.364657] CPU: 0 PID: 104 Comm: perf-exec Not tainted 6.6.0-rc6-00051-g391df82e8ec3-dirty #73\n[  444.364771] Hardware name: riscv-virtio,qemu (DT)\n[  444.364868] epc : smp_call_function_many_cond+0x42c/0x436\n[  444.364917]  ra : on_each_cpu_cond_mask+0x20/0x32\n[  444.364948] epc : ffffffff8009f9e0 ra : ffffffff8009fa5a sp : ff20000000003800\n[  444.364966]  gp : ffffffff81500aa0 tp : ff60000002b83000 t0 : ff200000000038c0\n[  444.364982]  t1 : ffffffff815021f0 t2 : 000000000000001f s0 : ff200000000038b0\n[  444.364998]  s1 : ff60000002c54d98 a0 : ff60000002a73940 a1 : 0000000000000000\n[  444.365013]  a2 : 0000000000000000 a3 : 0000000000000003 a4 : 0000000000000100\n[  444.365029]  a5 : 0000000000010100 a6 : 0000000000f00000 a7 : 0000000000000000\n[  444.365044]  s2 : 0000000000000000 s3 : ffffffffffffffff s4 : ff60000002c54d98\n[  444.365060]  s5 : ffffffff81539610 s6 : ffffffff80c20c48 s7 : 0000000000000000\n[  444.365075]  s8 : 0000000000000000 s9 : 0000000000000001 s10: 0000000000000001\n[  444.365090]  s11: ffffffff80099394 t3 : 0000000000000003 t4 : 00000000eac0c6e6\n[  444.365104]  t5 : 0000000400000000 t6 : ff60000002e010d0\n[  444.365120] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003\n[  444.365226] [<ffffffff8009f9e0>] smp_call_function_many_cond+0x42c/0x436\n[  444.365295] [<ffffffff8009fa5a>] on_each_cpu_cond_mask+0x20/0x32\n[  444.365311] [<ffffffff806e90dc>] pmu_sbi_ctr_start+0x7a/0xaa\n[  444.365327] [<ffffffff806e880c>] riscv_pmu_start+0x48/0x66\n[  444.365339] [<ffffffff8012111a>] perf_adjust_freq_unthr_context+0x196/0x1ac\n[  444.365356] [<ffffffff801237aa>] perf_event_task_tick+0x78/0x8c\n[  444.365368] [<ffffffff8003faf4>] scheduler_tick+0xe6/0x25e\n[  444.365383] [<ffffffff8008a042>] update_process_times+0x80/0x96\n[  444.365398] [<ffffffff800991ec>] tick_sched_handle+0x26/0x52\n[  444.365410] [<ffffffff800993e4>] tick_sched_timer+0x50/0x98\n[  444.365422] [<ffffffff8008a6aa>] __hrtimer_run_queues+0x126/0x18a\n[  444.365433] [<ffffffff8008b350>] hrtimer_interrupt+0xce/0x1da\n[  444.365444] [<ffffffff806cdc60>] riscv_timer_interrupt+0x30/0x3a\n[  444.365457] [<ffffffff8006afa6>] handle_percpu_devid_irq+0x80/0x114\n[  444.365470] [<ffffffff80065b82>] generic_handle_domain_irq+0x1c/0x2a\n[  444.365483] [<ffffffff8045faec>] riscv_intc_irq+0x2e/0x46\n[  444.365497] [<ffffffff808a9c62>] handle_riscv_irq+0x4a/0x74\n[  444.365521] [<ffffffff808aa760>] do_irq+0x7c/0x7e\n[  444.365796] ---[ end trace 0000000000000000 ]---\n\nThat's because the fix in commit 3fec323339a4 (\"drivers: perf: Fix panic\nin riscv SBI mmap support\") was wrong since there is no need to broadcast\nto other cpus when starting a counter, that's only needed in mmap when\nthe counters could have already been started on other cpus, so simply\nremove this broadcast.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":3.3},"cwes":[],"references":["https://git.kernel.org/stable/c/61e3d993c8bd3e80f8f1363ed5e04f88ab531b72","https://git.kernel.org/stable/c/85be1a73fd298ed3fd060dfce97caef5f9928c57","https://git.kernel.org/stable/c/61e3d993c8bd3e80f8f1363ed5e04f88ab531b72","https://git.kernel.org/stable/c/85be1a73fd298ed3fd060dfce97caef5f9928c57"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2023-52839","score":0.00209,"percentile":0.11144,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}