{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-52839", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52839", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-05-21T15:31:39.196Z", "updatedAt": "2026-05-11T19:34:00.710Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "drivers: perf: Do not broadcast to other cpus when starting a counter", "summary": "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] [] smp_call_function_many_cond+0x42c/0x436\n[ 444.365295] [] on_each_cpu_cond_mask+0x20/0x32\n[ 444.365311] [] pmu_sbi_ctr_start+0x7a/0xaa\n[ 444.365327] [] riscv_pmu_start+0x48/0x66\n[ 444.365339] [] perf_adjust_freq_unthr_context+0x196/0x1ac\n[ 444.365356] [] perf_event_task_tick+0x78/0x8c\n[ 444.365368] [] scheduler_tick+0xe6/0x25e\n[ 444.365383] [] update_process_times+0x80/0x96\n[ 444.365398] [] tick_sched_handle+0x26/0x52\n[ 444.365410] [] tick_sched_timer+0x50/0x98\n[ 444.365422] [] __hrtimer_run_queues+0x126/0x18a\n[ 444.365433] [] hrtimer_interrupt+0xce/0x1da\n[ 444.365444] [] riscv_timer_interrupt+0x30/0x3a\n[ 444.365457] [] handle_percpu_devid_irq+0x80/0x114\n[ 444.365470] [] generic_handle_domain_irq+0x1c/0x2a\n[ 444.365483] [] riscv_intc_irq+0x2e/0x46\n[ 444.365497] [] handle_riscv_irq+0x4a/0x74\n[ 444.365521] [] 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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3fec323339a4a9801a54e8b282eb571965b67b23", "status": "affected", "versionType": "git", "lessThan": "85be1a73fd298ed3fd060dfce97caef5f9928c57" }, { "version": "3fec323339a4a9801a54e8b282eb571965b67b23", "status": "affected", "versionType": "git", "lessThan": "61e3d993c8bd3e80f8f1363ed5e04f88ab531b72" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.6" }, { "version": "6.6.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.7", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }