{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"98074e16742ae87fb82e234b419783c5ffc9baea","status":"affected","version":"20002ded4d937ca87aca6253b874920a96a763c4","versionType":"git"},{"lessThan":"7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737","status":"affected","version":"20002ded4d937ca87aca6253b874920a96a763c4","versionType":"git"},{"lessThan":"e9bbfb4bfa86c6b5515b868d6982ac60505d7e39","status":"affected","version":"20002ded4d937ca87aca6253b874920a96a763c4","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"2.6.32"},{"lessThan":"2.6.32","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-43416","cwes":[],"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]","epss":{"date":"2026-11-06","percentile":0.01907,"score":0.00121},"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793979772602,"publishedAt":1778250112954,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/98074e16742ae87fb82e234b419783c5ffc9baea"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/7e5f60b8cfc02a2b23a40a5f5fd2fa81d010e737"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/e9bbfb4bfa86c6b5515b868d6982ac60505d7e39"}],"remediation":[],"revision":"7d5670469f9ac4842f7452188602f90282a6a2b4cc5d59bba73b6f7f99a94b2c","sources":[{"modifiedAt":1793979772602,"name":"CNA: Linux","retrievedAt":1793981698457,"url":"https://www.cve.org/CVERecord?id=CVE-2026-43416"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793981701359,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-43416"}],"ssvc":{"assessedAt":1793979469414,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"powerpc, perf: Check that current->mm is alive before getting user callchain","updatedAt":1793981701359}