{
  "cveId": "CVE-2026-43416",
  "url": "https://patchblox.com/security/cve/CVE-2026-43416",
  "summary": "CVE-2026-43416 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-43416, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "powerpc, perf: Check that current-\u003Emm is alive before getting user callchain",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc, perf: Check that current-\u003Emm is alive before getting user callchain  It may happen that mm is already released, which leads to kernel panic. This adds the NULL check for current-\u003Emm, similarly to commit 20afc60f892d (\u0022x86, perf: Check that current-\u003Emm is alive before getting user callchain\u0022).  I was getting this panic when running a profiling BPF program (profile.py from bcc-tools):      [26215.051935] Kernel attempted to read user page (588) - exploit attempt? (uid: 0)     [26215.051950] BUG: Kernel NULL pointer dereference on read at 0x00000588     [26215.051952] Faulting instruction address: 0xc00000000020fac0     [26215.051957] Oops: Kernel access of bad area, sig: 11 [#1]     [...]     [26215.052049] Call Trace:     [26215.052050] [c000000061da6d30] [c00000000020fc10] perf_callchain_user_64\u002B0x2d0/0x490 (unreliable)     [26215.052054] [c000000061da6dc0] [c00000000020f92c] perf_callchain_user\u002B0x1c/0x30     [26215.052057] [c000000061da6de0] [c0000000005ab2a0] get_perf_callchain\u002B0x100/0x360     [26215.052063] [c000000061da6e70] [c000000000573bc8] bpf_get_stackid\u002B0x88/0xf0     [26215.052067] [c000000061da6ea0] [c008000000042258] bpf_prog_16d4ab9ab662f669_do_perf_event\u002B0xf8/0x274     [...]  In addition, move storing the top-level stack entry to generic perf_callchain_user to make sure the top-evel entry is always captured, even if current-\u003Emm is NULL.  [Maddy: fixed message to avoid checkpatch format style error]",
  "published": "2026-05-08T15:16:53Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "NULL Pointer Dereference",
  "epss": 0.00121,
  "epssPercentile": 0.01901,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43416",
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}