ghsa-67mx-9px6-mhwv
Vulnerability from github
Published
2025-09-18 18:30
Modified
2025-09-18 18:30
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: cpumap: Fix memory leak in cpu_map_update_elem

Syzkaller reported a memory leak as follows:

BUG: memory leak unreferenced object 0xff110001198ef748 (size 192): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 32 bytes): 00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J........... 00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(....... backtrace: [] __cpu_map_entry_alloc+0xf7/0xb00 [] cpu_map_update_elem+0x2fe/0x3d0 [] bpf_map_update_value.isra.0+0x2bd/0x520 [] map_update_elem+0x4cb/0x720 [] __se_sys_bpf+0x8c3/0xb90 [] do_syscall_64+0x30/0x40 [] entry_SYSCALL_64_after_hwframe+0x61/0xc6

BUG: memory leak unreferenced object 0xff110001198ef528 (size 192): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] __cpu_map_entry_alloc+0x260/0xb00 [] cpu_map_update_elem+0x2fe/0x3d0 [] bpf_map_update_value.isra.0+0x2bd/0x520 [] map_update_elem+0x4cb/0x720 [] __se_sys_bpf+0x8c3/0xb90 [] do_syscall_64+0x30/0x40 [] entry_SYSCALL_64_after_hwframe+0x61/0xc6

BUG: memory leak unreferenced object 0xff1100010fd93d68 (size 8): comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s) hex dump (first 8 bytes): 00 00 00 00 00 00 00 00 ........ backtrace: [] kvmalloc_node+0x11e/0x170 [] __cpu_map_entry_alloc+0x2f0/0xb00 [] cpu_map_update_elem+0x2fe/0x3d0 [] bpf_map_update_value.isra.0+0x2bd/0x520 [] map_update_elem+0x4cb/0x720 [] __se_sys_bpf+0x8c3/0xb90 [] do_syscall_64+0x30/0x40 [] entry_SYSCALL_64_after_hwframe+0x61/0xc6

In the cpu_map_update_elem flow, when kthread_stop is called before calling the threadfn of rcpu->kthread, since the KTHREAD_SHOULD_STOP bit of kthread has been set by kthread_stop, the threadfn of rcpu->kthread will never be executed, and rcpu->refcnt will never be 0, which will lead to the allocated rcpu, rcpu->queue and rcpu->queue->queue cannot be released.

Calling kthread_stop before executing kthread's threadfn will return -EINTR. We can complete the release of memory resources in this state.

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53441"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-18T16:15:48Z",
    "severity": null
  },
  "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    [\u003cffffffffadd28087\u003e] __cpu_map_entry_alloc+0xf7/0xb00\n    [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n    [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n    [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n    [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n    [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n    [\u003cffffffffb0400099\u003e] 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    [\u003cffffffffadd281f0\u003e] __cpu_map_entry_alloc+0x260/0xb00\n    [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n    [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n    [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n    [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n    [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n    [\u003cffffffffb0400099\u003e] 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    [\u003cffffffffade5db3e\u003e] kvmalloc_node+0x11e/0x170\n    [\u003cffffffffadd28280\u003e] __cpu_map_entry_alloc+0x2f0/0xb00\n    [\u003cffffffffadd28d8e\u003e] cpu_map_update_elem+0x2fe/0x3d0\n    [\u003cffffffffadc6d0fd\u003e] bpf_map_update_value.isra.0+0x2bd/0x520\n    [\u003cffffffffadc7349b\u003e] map_update_elem+0x4cb/0x720\n    [\u003cffffffffadc7d983\u003e] __se_sys_bpf+0x8c3/0xb90\n    [\u003cffffffffb029cc80\u003e] do_syscall_64+0x30/0x40\n    [\u003cffffffffb0400099\u003e] 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-\u003ekthread, since the KTHREAD_SHOULD_STOP bit\nof kthread has been set by kthread_stop, the threadfn of rcpu-\u003ekthread\nwill never be executed, and rcpu-\u003erefcnt will never be 0, which will\nlead to the allocated rcpu, rcpu-\u003equeue and rcpu-\u003equeue-\u003equeue cannot be\nreleased.\n\nCalling kthread_stop before executing kthread\u0027s threadfn will return\n-EINTR. We can complete the release of memory resources in this state.",
  "id": "GHSA-67mx-9px6-mhwv",
  "modified": "2025-09-18T18:30:28Z",
  "published": "2025-09-18T18:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53441"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4369016497319a9635702da010d02af1ebb1849d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a957ac8e0b5ffb5797382a6adbafd005a5f72851"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b11a9b4f28cb6ff69ef7e69809e5f7fffeac9030"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d26299f50f5ea8f0aeb5d49e659c31f64233c816"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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