{"cve":"CVE-2026-43416","nvd":{"published":"2026-05-08T15:16:53.597","modified":"2026-06-17T10:49:33.417","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc, perf: Check that current->mm is alive before getting user callchain\n\nIt may happen that mm is already released, which leads to kernel panic.\nThis adds the NULL check for current->mm, similarly to\ncommit 20afc60f892d (\"x86, perf: Check that current->mm is alive before getting user callchain\").\n\nI was getting this panic when running a profiling BPF program\n(profile.py from bcc-tools):\n\n    [26215.051935] Kernel attempted to read user page (588) - exploit attempt? (uid: 0)\n    [26215.051950] BUG: Kernel NULL pointer dereference on read at 0x00000588\n    [26215.051952] Faulting instruction address: 0xc00000000020fac0\n    [26215.051957] Oops: Kernel access of bad area, sig: 11 [#1]\n    [...]\n    [26215.052049] Call Trace:\n    [26215.052050] [c000000061da6d30] [c00000000020fc10] perf_callchain_user_64+0x2d0/0x490 (unreliable)\n    [26215.052054] [c000000061da6dc0] [c00000000020f92c] perf_callchain_user+0x1c/0x30\n    [26215.052057] [c000000061da6de0] [c0000000005ab2a0] get_perf_callchain+0x100/0x360\n    [26215.052063] [c000000061da6e70] [c000000000573bc8] bpf_get_stackid+0x88/0xf0\n    [26215.052067] [c000000061da6ea0] [c008000000042258] bpf_prog_16d4ab9ab662f669_do_perf_event+0xf8/0x274\n    [...]\n\nIn addition, move storing the top-level stack entry to generic\nperf_callchain_user to make sure the top-evel entry is always captured,\neven if current->mm is NULL.\n\n[Maddy: fixed message to avoid checkpatch format style error]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737","https://git.kernel.org/stable/c/98074e16742ae87fb82e234b419783c5ffc9baea","https://git.kernel.org/stable/c/e9bbfb4bfa86c6b5515b868d6982ac60505d7e39"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-43416","score":0.00121,"percentile":0.01875,"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."]}