kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case

{
  "id": "56d54148536148629dcf87c89b37dec5f5d544400ba51f89790d97c6567fd6b9",
  "url": "https://osv.dev/vulnerability/CVE-2022-49779",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free: Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2) WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 Modules linked in: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18 [...] Call Trace: __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.",
    "evidence": "osv:CVE-2022-49779",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.225",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.156",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.80",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49779",
      "aliases": [
        "CVE-2022-49779"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0bc11ed5ab60c135aa764a62c02cd5ea68289de4"
                },
                {
                  "fixed": "7b0007b28dd970176f2e297c06ae63eea2447127"
                },
                {
                  "fixed": "7d606ae1abcc3eab5408e42444d789dc7def51b8"
                },
                {
                  "fixed": "c49cc2c059b503e962c2f13a806c105f9b757df4"
                },
                {
                  "fixed": "55788ebbe8b365b4375bd56b4ba7db79d393a370"
                },
                {
                  "fixed": "5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49779.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.4.0"
                },
                {
                  "fixed": "5.4.225"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.156"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.80"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49779.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.953839217Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370",
        "https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb",
        "https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127",
        "https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8",
        "https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49779.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49779",
        "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/2022/49xxx/CVE-2022-49779.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49779",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521529,
  "published_at": "2025-05-01T14:09:14.445+00:00"
}