{
  "cveId": "CVE-2022-49067",
  "url": "https://patchblox.com/security/cve/CVE-2022-49067",
  "summary": "CVE-2022-49067 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49067, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  powerpc: Fix virt_addr_valid() for 64-bit Book3E...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc: Fix virt_addr_valid() for 64-bit Book3E \u0026 32-bit  mpe: On 64-bit Book3E vmalloc space starts at 0x8000000000000000.  Because of the way __pa() works we have:   __pa(0x8000000000000000) == 0, and therefore   virt_to_pfn(0x8000000000000000) == 0, and therefore   virt_addr_valid(0x8000000000000000) == true  Which is wrong, virt_addr_valid() should be false for vmalloc space. In fact all vmalloc addresses that alias with a valid PFN will return true from virt_addr_valid(). That can cause bugs with hardened usercopy as described below by Kefeng Wang:    When running ethtool eth0 on 64-bit Book3E, a BUG occurred:      usercopy: Kernel memory exposure attempt detected from SLUB object not in SLUB page?! (offset 0, size 1048)!     kernel BUG at mm/usercopy.c:99     ...     usercopy_abort\u002B0x64/0xa0 (unreliable)     __check_heap_object\u002B0x168/0x190     __check_object_size\u002B0x1a0/0x200     dev_ethtool\u002B0x2494/0x2b20     dev_ioctl\u002B0x5d0/0x770     sock_do_ioctl\u002B0xf0/0x1d0     sock_ioctl\u002B0x3ec/0x5a0     __se_sys_ioctl\u002B0xf0/0x160     system_call_exception\u002B0xfc/0x1f0     system_call_common\u002B0xf8/0x200    The code shows below,      data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));     copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))    The data is alloced by vmalloc(), virt_addr_valid(ptr) will return true   on 64-bit Book3E, which leads to the panic.    As commit 4dd7554a6456 (\u0022powerpc/64: Add VIRTUAL_BUG_ON checks for __va   and __pa addresses\u0022) does, make sure the virt addr above PAGE_OFFSET in   the virt_addr_valid() for 64-bit, also add upper limit check to make   sure the virt is below high_memory.    Meanwhile, for 32-bit PAGE_OFFSET is the virtual address of the start   of lowmem, high_memory is the upper low virtual address, the check is   suitable for 32-bit, this will fix the issue mentioned in commit   602946ec2f90 (\u0022powerpc: Set max_mapnr correctly\u0022) too.  On 32-bit there is a similar problem with high memory, that was fixed in commit 602946ec2f90 (\u0022powerpc: Set max_mapnr correctly\u0022), but that commit breaks highmem and needs to be reverted.  We can\u0027t easily fix __pa(), we have code that relies on its current behaviour. So for now add extra checks to virt_addr_valid().  For 64-bit Book3S the extra checks are not necessary, the combination of virt_to_pfn() and pfn_valid() should yield the correct result, but they are harmless.  [mpe: Add additional change log detail]",
  "published": "2025-02-26T07:00:43Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00262,
  "epssPercentile": 0.18118,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.17.3-1",
      "fix": "DEBIAN-CVE-2022-49067",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49067",
      "released": "2025-02-26T07:00:43Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.17.3-1",
      "fix": "DEBIAN-CVE-2022-49067",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49067",
      "released": "2025-02-26T07:00:43Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.17.3-1",
      "fix": "DEBIAN-CVE-2022-49067",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2022-49067",
      "released": "2025-02-26T07:00:43Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}