tpm: fix reference counting for struct tpm_chip

{
  "id": "55f3b612e865d01af99ceafb0038888d1a979a576165c0b85879c21eaaa869fd",
  "url": "https://osv.dev/vulnerability/CVE-2022-49287",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tpm: fix reference counting for struct tpm_chip",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tpm: fix reference counting for struct tpm_chip The following sequence of operations results in a refcount warning: 1. Open device /dev/tpmrm. 2. Remove module tpm_tis_spi. 3. Write a TPM command to the file descriptor opened at step 1. ------------[ cut here ]------------ WARNING: CPU: 3 PID: 1161 at lib/refcount.c:25 kobject_get+0xa0/0xa4 refcount_t: addition on 0; use-after-free. Modules linked in: tpm_tis_spi tpm_tis_core tpm mdio_bcm_unimac brcmfmac sha256_generic libsha256 sha256_arm hci_uart btbcm bluetooth cfg80211 vc4 brcmutil ecdh_generic ecc snd_soc_core crc32_arm_ce libaes raspberrypi_hwmon ac97_bus snd_pcm_dmaengine bcm2711_thermal snd_pcm snd_timer genet snd phy_generic soundcore [last unloaded: spi_bcm2835] CPU: 3 PID: 1161 Comm: hold_open Not tainted 5.10.0ls-main-dirty #2 Hardware name: BCM2711 [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0xc4/0xd8) [] (dump_stack) from [] (__warn+0x104/0x108) [] (__warn) from [] (warn_slowpath_fmt+0x74/0xb8) [] (warn_slowpath_fmt) from [] (kobject_get+0xa0/0xa4) [] (kobject_get) from [] (tpm_try_get_ops+0x14/0x54 [tpm]) [] (tpm_try_get_ops [tpm]) from [] (tpm_common_write+0x38/0x60 [tpm]) [] (tpm_common_write [tpm]) from [] (vfs_write+0xc4/0x3c0) [] (vfs_write) from [] (ksys_write+0x58/0xcc) [] (ksys_write) from [] (ret_fast_syscall+0x0/0x4c) Exception stack(0xc226bfa8 to 0xc226bff0) bfa0: 00000000 000105b4 0000000",
    "evidence": "osv:CVE-2022-49287",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-49287",
      "aliases": [
        "CVE-2022-49287"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:53.120028304Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/290e05f346d1829e849662c97e42d5ad984f5258",
        "https://git.kernel.org/stable/c/2f928c0d5c02dbab49e8c19d98725c822f6fc409",
        "https://git.kernel.org/stable/c/473a66f99cb8173c14138c5a5c69bfad04e8f9ac",
        "https://git.kernel.org/stable/c/662893b4f6bd466ff9e1cd454c44c26d32d554fe",
        "https://git.kernel.org/stable/c/6e7baf84149fb43950631415de231b3a41915aa3",
        "https://git.kernel.org/stable/c/7e0438f83dc769465ee663bb5dcf8cc154940712",
        "https://git.kernel.org/stable/c/a27ed2f3695baf15f9b34d2d7a1f9fc105539a81",
        "https://git.kernel.org/stable/c/cb64bd038beacb4331fe464a36c8b5481e8f51e2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49287.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49287",
        "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-2022-49287.json"
      }
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    "related_cves": [
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        "value": "CVE-2022-49287",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521525,
  "published_at": "2025-02-26T01:56:26.059+00:00"
}