CVE-2026-43331 (GCVE-0-2026-43331)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-06-19 11:58
VLAI
Title
x86/kexec: Disable KCOV instrumentation after load_segments()
Summary
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's 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. ]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef , < 0e96cd314c0d819c1635d68125a4d77852c2162e (git)
Affected: 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef , < 593d67032544b9271094fc9b43e437e017cb2b2f (git)
Affected: 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef , < 1e3e98596c2769721ade0418434852fb3af4849a (git)
Affected: 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef , < de05c66fab8847237a9ca216934e56d3ee837f08 (git)
Affected: 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef , < 917e3ad3321e75ca0223d5ccf26ceda116aa51e1 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nx86/kexec: Deshabilitar la instrumentaci\u00f3n KCOV despu\u00e9s de load_segments()\n\nLa funci\u00f3n load_segments() cambia los registros de segmento, invalidando la base GS (en la que KCOV se basa para los datos por CPU). Cuando CONFIG_KCOV est\u00e1 habilitado, cualquier llamada posterior a c\u00f3digo C instrumentado (por ejemplo, native_gdt_invalidate()) comienza a bloquear el kernel en un bucle infinito.\n\nPara reproducir el problema, es suficiente con hacer kexec en un kernel instrumentado con KCOV:\n\n  $ kexec -l /boot/otherKernel\n  $ kexec -e\n\nEl contexto real de este problema es la habilitaci\u00f3n de la recolecci\u00f3n de volcados de fallos en syzkaller. Para esto, la herramienta carga un kernel de p\u00e1nico antes del fuzzing y luego llama a makedumpfile despu\u00e9s del p\u00e1nico. Este flujo de trabajo requiere que tanto CONFIG_KEXEC como CONFIG_KCOV est\u00e9n habilitados simult\u00e1neamente.\n\nA\u00f1adir salvaguardas directamente a la ruta r\u00e1pida de KCOV (__sanitizer_cov_trace_pc()) tambi\u00e9n es indeseable ya que introducir\u00eda una sobrecarga de rendimiento adicional.\n\nDeshabilitar la instrumentaci\u00f3n para las funciones individuales ser\u00eda demasiado fr\u00e1gil, as\u00ed que se deshabilita la instrumentaci\u00f3n KCOV para todo machine_kexec_64.c y physaddr.c. Si el fuzzing guiado por cobertura alguna vez necesita estos componentes en el futuro, se deber\u00edan considerar otros enfoques.\n\nEl problema no es relevante para kernels de 32 bits ya que CONFIG_KCOV no es compatible all\u00ed.\n\n  [ bp: Espaciar el comentario para una mejor legibilidad. ]"
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      "id": "CVE-2026-43331",
      "initial_release_date": "2026-05-13T03:35:16Z",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "370",
      "product_status:recommended": "145",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43331",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-43331.json",
      "version": "8"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.