{
  "cveId": "CVE-2023-52443",
  "url": "https://patchblox.com/security/cve/CVE-2023-52443",
  "summary": "CVE-2023-52443 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52443, released February 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  apparmor: avoid crash when parsed profile name i...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  apparmor: avoid crash when parsed profile name is empty  When processing a packed profile in unpack_profile() described like   \u0022profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}\u0022  a string \u0022:samba-dcerpcd\u0022 is unpacked as a fully-qualified name and then passed to aa_splitn_fqname().  aa_splitn_fqname() treats \u0022:samba-dcerpcd\u0022 as only containing a namespace. Thus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later aa_alloc_profile() crashes as the new profile name is NULL now.  general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16 Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP: 0010:strlen\u002B0x1e/0xa0 Call Trace:  \u003CTASK\u003E  ? strlen\u002B0x1e/0xa0  aa_policy_init\u002B0x1bb/0x230  aa_alloc_profile\u002B0xb1/0x480  unpack_profile\u002B0x3bc/0x4960  aa_unpack\u002B0x309/0x15e0  aa_replace_profiles\u002B0x213/0x33c0  policy_update\u002B0x261/0x370  profile_replace\u002B0x20e/0x2a0  vfs_write\u002B0x2af/0xe00  ksys_write\u002B0x126/0x250  do_syscall_64\u002B0x46/0xf0  entry_SYSCALL_64_after_hwframe\u002B0x6e/0x76  \u003C/TASK\u003E ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen\u002B0x1e/0xa0  It seems such behaviour of aa_splitn_fqname() is expected and checked in other places where it is called (e.g. aa_remove_profiles). Well, there is an explicit comment \u0022a ns name without a following profile is allowed\u0022 inside.  AFAICS, nothing can prevent unpacked \u0022name\u0022 to be in form like \u0022:samba-dcerpcd\u0022 - it is passed from userspace.  Deny the whole profile set replacement in such case and inform user with EPROTO and an explaining message.  Found by Linux Verification Center (linuxtesting.org).",
  "published": "2024-02-22T17:15:08Z",
  "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": 0.0024,
  "epssPercentile": 0.1518,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.76-1",
      "fix": "DEBIAN-CVE-2023-52443",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52443",
      "released": "2024-02-22T17:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.6.15-1",
      "fix": "DEBIAN-CVE-2023-52443",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52443",
      "released": "2024-02-22T17:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.6.15-1",
      "fix": "DEBIAN-CVE-2023-52443",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52443",
      "released": "2024-02-22T17:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}