{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53441",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53441"
  ],
  "published": "2025-09-18T16:08:26Z",
  "summary": "bpf: cpumap: Fix memory leak in cpu_map_update_elem",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: cpumap: Fix memory leak in cpu_map_update_elem\n\nSyzkaller reported a memory leak as follows:\n\nBUG: memory leak\nunreferenced object 0xff110001198ef748 (size 192):\n  comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n  hex dump (first 32 bytes):\n    00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00  ....J...........\n    00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff  ........(.......\n  backtrace:\n    [<ffffffffadd28087>] __cpu_map_entry_alloc+0xf7/0xb00\n    [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0\n    [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520\n    [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720\n    [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90\n    [<ffffffffb029cc80>] do_syscall_64+0x30/0x40\n    [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff110001198ef528 (size 192):\n  comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<ffffffffadd281f0>] __cpu_map_entry_alloc+0x260/0xb00\n    [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0\n    [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520\n    [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720\n    [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90\n    [<ffffffffb029cc80>] do_syscall_64+0x30/0x40\n    [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nBUG: memory leak\nunreferenced object 0xff1100010fd93d68 (size 8):\n  comm \"syz-executor.3\", pid 17672, jiffies 4298118891 (age 9.906s)\n  hex dump (first 8 bytes):\n    00 00 00 00 00 00 00 00                          ........\n  backtrace:\n    [<ffffffffade5db3e>] kvmalloc_node+0x11e/0x170\n    [<ffffffffadd28280>] __cpu_map_entry_alloc+0x2f0/0xb00\n    [<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0\n    [<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520\n    [<ffffffffadc7349b>] map_update_elem+0x4cb/0x720\n    [<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90\n    [<ffffffffb029cc80>] do_syscall_64+0x30/0x40\n    [<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6\n\nIn the cpu_map_update_elem flow, when kthread_stop is called before\ncalling the threadfn of rcpu->kthread, since the KTHREAD_SHOULD_STOP bit\nof kthread has been set by kthread_stop, the threadfn of rcpu->kthread\nwill never be executed, and rcpu->refcnt will never be 0, which will\nlead to the allocated rcpu, rcpu->queue and rcpu->queue->queue cannot be\nreleased.\n\nCalling kthread_stop before executing kthread's threadfn will return\n-EINTR. We can complete the release of memory resources in this state.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53441"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d26299f50f5ea8f0aeb5d49e659c31f64233c816"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b11a9b4f28cb6ff69ef7e69809e5f7fffeac9030"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a957ac8e0b5ffb5797382a6adbafd005a5f72851"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4369016497319a9635702da010d02af1ebb1849d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}