{
  "threat_severity" : "Moderate",
  "public_date" : "2025-10-01T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: powerpc/rtas_flash: allow user copy to flash block cache objects",
    "id" : "2400784",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2400784"
  },
  "cvss3" : {
    "cvss3_base_score" : "4.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-276",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\npowerpc/rtas_flash: allow user copy to flash block cache objects\nWith hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the\n/proc/powerpc/rtas/firmware_update interface to prepare a system\nfirmware update yields a BUG():\nkernel BUG at mm/usercopy.c:102!\nOops: Exception in kernel mode, sig: 5 [#1]\nLE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\nModules linked in:\nCPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2\nHardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries\nNIP:  c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000\nREGS: c0000000148c76a0 TRAP: 0700   Not tainted  (6.5.0-rc3+)\nMSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24002242  XER: 0000000c\nCFAR: c0000000001fbd34 IRQMASK: 0\n[ ... GPRs omitted ... ]\nNIP usercopy_abort+0xa0/0xb0\nLR  usercopy_abort+0x9c/0xb0\nCall Trace:\nusercopy_abort+0x9c/0xb0 (unreliable)\n__check_heap_object+0x1b4/0x1d0\n__check_object_size+0x2d0/0x380\nrtas_flash_write+0xe4/0x250\nproc_reg_write+0xfc/0x160\nvfs_write+0xfc/0x4e0\nksys_write+0x90/0x160\nsystem_call_exception+0x178/0x320\nsystem_call_common+0x160/0x2c4\nThe blocks of the firmware image are copied directly from user memory\nto objects allocated from flash_block_cache, so flash_block_cache must\nbe created using kmem_cache_create_usercopy() to mark it safe for user\naccess.\n[mpe: Trim and indent oops]" ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-53487\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53487\nhttps://lore.kernel.org/linux-cve-announce/2025100115-CVE-2023-53487-c3f7@gregkh/T" ],
  "name" : "CVE-2023-53487",
  "csaw" : false
}