{
  "cveId": "CVE-2026-43331",
  "url": "https://patchblox.com/security/cve/CVE-2026-43331",
  "summary": "CVE-2026-43331 is fixed in 14 products on 1 platform, first by DEBIAN-CVE-2026-43331, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "x86/kexec: Disable KCOV instrumentation after load_segments()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  x86/kexec: Disable KCOV instrumentation after load_segments()  The load_segments() function changes segment registers, invalidating GS base (which KCOV relies on for per-cpu data). When CONFIG_KCOV is enabled, any subsequent instrumented C code call (e.g. native_gdt_invalidate()) begins crashing the kernel in an endless loop.  To reproduce the problem, it\u0027s sufficient to do kexec on a KCOV-instrumented kernel:    $ kexec -l /boot/otherKernel   $ kexec -e  The real-world context for this problem is enabling crash dump collection in syzkaller. For this, the tool loads a panic kernel before fuzzing and then calls makedumpfile after the panic. This workflow requires both CONFIG_KEXEC and CONFIG_KCOV to be enabled simultaneously.  Adding safeguards directly to the KCOV fast-path (__sanitizer_cov_trace_pc()) is also undesirable as it would introduce an extra performance overhead.  Disabling instrumentation for the individual functions would be too fragile, so disable KCOV instrumentation for the entire machine_kexec_64.c and physaddr.c. If coverage-guided fuzzing ever needs these components in the future, other approaches should be considered.  The problem is not relevant for 32 bit kernels as CONFIG_KCOV is not supported there.    [ bp: Space out comment for better readability. ]",
  "published": "2026-05-08T14:16:42Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00122,
  "epssPercentile": 0.01985,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43331",
  "fixes": [
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      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
    },
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      "product": "kernel-64kb",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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      "released": "2026-09-22T15:26:20Z"
    },
    {
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      "fix": "SUSE-SU-2026:23902-1",
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      "released": "2026-09-22T14:23:31Z"
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  "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"
  }
}