kprobes: avoid crash when rmmod/insmod after ftrace killed

{
  "id": "33ad7e897c7f8aa38a93fdd714e515fe512ae43c08dac2c0a4a7317c1afe4c5d",
  "url": "https://osv.dev/vulnerability/CVE-2026-43409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "kprobes: avoid crash when rmmod/insmod after ftrace killed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: kprobes: avoid crash when rmmod/insmod after ftrace killed After we hit ftrace is killed by some errors, the kernel crash if we remove modules in which kprobe probes. BUG: unable to handle page fault for address: fffffbfff805000d PGD 817fcc067 P4D 817fcc067 PUD 817fc8067 PMD 101555067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 4 UID: 0 PID: 2012 Comm: rmmod Tainted: G W OE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE RIP: 0010:kprobes_module_callback+0x89/0x790 RSP: 0018:ffff88812e157d30 EFLAGS: 00010a02 RAX: 1ffffffff805000d RBX: dffffc0000000000 RCX: ffffffff86a8de90 RDX: ffffed1025c2af9b RSI: 0000000000000008 RDI: ffffffffc0280068 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1025c2af9a R10: ffff88812e157cd7 R11: 205d323130325420 R12: 0000000000000002 R13: ffffffffc0290488 R14: 0000000000000002 R15: ffffffffc0280040 FS: 00007fbc450dd740(0000) GS:ffff888420331000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff805000d CR3: 000000010f624000 CR4: 00000000000006f0 Call Trace: notifier_call_chain+0xc6/0x280 blocking_notifier_call_chain+0x60/0x90 __do_sys_delete_module.constprop.0+0x32a/0x4e0 do_syscall_64+0x5d/0xfa0 entry_SYSCALL_64_after_hwframe+0x76/0x7e This is because the kprobe on ftrace does not correctly handles the kprobe_ftrace_disabled flag set by ftrace_kill(). To prevent this error, check kprobe_ftrace_disabled in __disarm_kprobe_ftr",
    "evidence": "osv:CVE-2026-43409",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.78",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-43409",
      "aliases": [
        "CVE-2026-43409"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ae6aa16fdc163afe6b04b6c073ad4ddd4663c03b"
                },
                {
                  "fixed": "8b6767e4141b2a42745b544d4555cf1614ba1a2d"
                },
                {
                  "fixed": "b0ca81616a010807e91fc31db9be242b96326adc"
                },
                {
                  "fixed": "cae928e3178c75602c21d67e21255d73e7e9ed4f"
                },
                {
                  "fixed": "9edc79d664832a842012ad105b1521c1a3c35ab3"
                },
                {
                  "fixed": "e113f0b46d19626ec15388bcb91432c9a4fd6261"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43409.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.7.0"
                },
                {
                  "fixed": "6.6.130"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.78"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43409.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.163476669Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/8b6767e4141b2a42745b544d4555cf1614ba1a2d",
        "https://git.kernel.org/stable/c/9edc79d664832a842012ad105b1521c1a3c35ab3",
        "https://git.kernel.org/stable/c/b0ca81616a010807e91fc31db9be242b96326adc",
        "https://git.kernel.org/stable/c/cae928e3178c75602c21d67e21255d73e7e9ed4f",
        "https://git.kernel.org/stable/c/e113f0b46d19626ec15388bcb91432c9a4fd6261",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43409.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43409",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43409.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43409",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497253,
  "published_at": "2026-05-08T14:21:48.239+00:00"
}