{
  "cveId": "CVE-2023-53747",
  "url": "https://patchblox.com/security/cve/CVE-2023-53747",
  "summary": "CVE-2023-53747 is fixed in 77 products on 1 platform, first by ALAS2023-2023-228, released June 21, 2023. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  vc_screen: reload load of struct vc_data pointer...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF  After a call to console_unlock() in vcs_write() the vc_data struct can be freed by vc_port_destruct(). Because of that, the struct vc_data pointer must be reloaded in the while loop in vcs_write() after console_lock() to avoid a UAF when vcs_size() is called.  Syzkaller reported a UAF in vcs_size().  BUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119  Call Trace:  \u003CTASK\u003E __asan_report_load4_noabort (mm/kasan/report_generic.c:380) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_write (drivers/tty/vt/vc_screen.c:664) vfs_write (fs/read_write.c:582 fs/read_write.c:564) ...  \u003CTASK\u003E  Allocated by task 1213: kmalloc_trace (mm/slab_common.c:1064) vc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680     drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058) con_install (drivers/tty/vt/vt.c:3334) tty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415     drivers/tty/tty_io.c:1392) tty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:921) vfs_open (fs/open.c:1052) ...  Freed by task 4116: kfree (mm/slab_common.c:1016) vc_port_destruct (drivers/tty/vt/vt.c:1044) tty_port_destructor (drivers/tty/tty_port.c:296) tty_port_put (drivers/tty/tty_port.c:312) vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2)) vt_ioctl (drivers/tty/vt/vt_ioctl.c:903) tty_ioctl (drivers/tty/tty_io.c:2778) ...  The buggy address belongs to the object at ffff8880beab8800  which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 424 bytes inside of  freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00)  The buggy address belongs to the physical page: page:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000     index:0x0 pfn:0xbeab8 head:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0     pincount:0 flags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected  Memory state around the buggy address:  ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb  ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb \u003Effff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb                                   ^  ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb  ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Disabling lock debugging due to kernel taint",
  "published": "2023-06-21T19:11:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00139,
  "epssPercentile": 0.03289,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool",
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      "fixedVersion": "0:7.4.0-503.11.1.el9_5",
      "fix": "RHSA-2024:9315",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2024-9315",
      "released": "2024-11-12T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "6.1.34-56.100.amzn2023",
      "fix": "ALAS2023-2023-228",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-228",
      "released": "2023-06-21T19:11:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool-debuginfo",
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