{
  "cveId": "CVE-2023-52504",
  "url": "https://patchblox.com/security/cve/CVE-2023-52504",
  "summary": "CVE-2023-52504 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52504, released March 2, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  x86/alternatives: Disable KASAN in apply_alterna...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  x86/alternatives: Disable KASAN in apply_alternatives()  Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine:  \tBUG: KASAN: out-of-bounds in rcu_is_watching() \tRead of size 4 at addr ff110003ee6419a0 by task swapper/0/0 \t... \t__asan_load4() \trcu_is_watching() \ttrace_hardirqs_on() \ttext_poke_early() \tapply_alternatives() \t...  On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled().  KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue.  Fix it for real by disabling KASAN while the kernel is patching alternatives.  [ mingo: updated the changelog ]",
  "published": "2024-03-02T22:15:47Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00278,
  "epssPercentile": 0.20318,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.64-1",
      "fix": "DEBIAN-CVE-2023-52504",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52504",
      "released": "2024-03-02T22:15:47Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.5.8-1",
      "fix": "DEBIAN-CVE-2023-52504",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52504",
      "released": "2024-03-02T22:15:47Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.5.8-1",
      "fix": "DEBIAN-CVE-2023-52504",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-52504",
      "released": "2024-03-02T22:15:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}