ghsa-q5mm-hfp5-3xxh
Vulnerability from github
Published
2025-09-15 15:31
Modified
2025-09-15 15:31
Details

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

media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()

Wei Chen reports a kernel bug as blew:

general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] ... Call Trace: __i2c_transfer+0x77e/0x1930 drivers/i2c/i2c-core-base.c:2109 i2c_transfer+0x1d5/0x3d0 drivers/i2c/i2c-core-base.c:2170 i2cdev_ioctl_rdwr+0x393/0x660 drivers/i2c/i2c-dev.c:297 i2cdev_ioctl+0x75d/0x9f0 drivers/i2c/i2c-dev.c:458 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd834a8bded

In az6027_i2c_xfer(), if msg[i].addr is 0x99, a null-ptr-deref will caused when accessing msg[i].buf. For msg[i].len is 0 and msg[i].buf is null.

Fix this by checking msg[i].len in az6027_i2c_xfer().

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50272"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-15T15:15:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()\n\nWei Chen reports a kernel bug as blew:\n\ngeneral protection fault, probably for non-canonical address\nKASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n...\nCall Trace:\n\u003cTASK\u003e\n__i2c_transfer+0x77e/0x1930 drivers/i2c/i2c-core-base.c:2109\ni2c_transfer+0x1d5/0x3d0 drivers/i2c/i2c-core-base.c:2170\ni2cdev_ioctl_rdwr+0x393/0x660 drivers/i2c/i2c-dev.c:297\ni2cdev_ioctl+0x75d/0x9f0 drivers/i2c/i2c-dev.c:458\nvfs_ioctl fs/ioctl.c:51 [inline]\n__do_sys_ioctl fs/ioctl.c:870 [inline]\n__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7fd834a8bded\n\nIn az6027_i2c_xfer(), if msg[i].addr is 0x99,\na null-ptr-deref will caused when accessing msg[i].buf.\nFor msg[i].len is 0 and msg[i].buf is null.\n\nFix this by checking msg[i].len in az6027_i2c_xfer().",
  "id": "GHSA-q5mm-hfp5-3xxh",
  "modified": "2025-09-15T15:31:25Z",
  "published": "2025-09-15T15:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ed554fd769a19ea8464bb83e9ac201002ef74ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/210fcf64be4db82c0e190e74b5111e4eef661a7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b6a8a1a32746981044e7ab06649c804acb4068a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/559891d430e3f3a178040c4371ed419edbfa7d65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b60cf73a931af34b7a0a3f467a79d9fe0df2d70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fbc44731a4665cbe92a5090e9804a388a72214b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7abfe467cd685f5da7ecb415441e45e3e4e2baa8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b256d23361c51aa4b7fdb71176c1ca50966fb39"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c712d1ccbfb787620422b437a5b8fac0802547bd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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