cve-2026-46316

{
  "cvss": 9.3,
  "datePublished": "2026-06-09T13:16:36.887",
  "dateUpdated": "2026-09-16T13:18:00.307",
  "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry\n\nvgic_its_invalidate_cache() walks the per-ITS translation cache with\nxa_for_each() and drops the cache's reference on each entry with\nvgic_put_irq(). It puts the iterated pointer, though, rather than the\nvalue returned by xa_erase().\n\nThe function is called from contexts that do not exclude one another: the\nITS command handlers hold its_lock, the GITS_CTLR write path holds\ncmd_lock, and the path that clears EnableLPIs in a redistributor's\nGICR_CTLR holds neither. Two or more of them can drain the same cache\nconcurrently, and if each one observes the same entry, erases it and then\nputs it, the single reference the cache holds on that entry is dropped\nmore than once. The entry can then be freed while an ITE still maps it.\n\nxa_erase() is atomic and returns the previous entry, so put only the entry\nthat this context actually removed. The cache reference is then dropped\nexactly once per entry even when the invalidations run concurrently, and\nthe behavior is unchanged when only one context runs.",
  "id": "CVE-2026-46316",
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    "descriptions": [
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        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry\n\nvgic_its_invalidate_cache() walks the per-ITS translation cache with\nxa_for_each() and drops the cache's reference on each entry with\nvgic_put_irq(). It puts the iterated pointer, though, rather than the\nvalue returned by xa_erase().\n\nThe function is called from contexts that do not exclude one another: the\nITS command handlers hold its_lock, the GITS_CTLR write path holds\ncmd_lock, and the path that clears EnableLPIs in a redistributor's\nGICR_CTLR holds neither. Two or more of them can drain the same cache\nconcurrently, and if each one observes the same entry, erases it and then\nputs it, the single reference the cache holds on that entry is dropped\nmore than once. The entry can then be freed while an ITE still maps it.\n\nxa_erase() is atomic and returns the previous entry, so put only the entry\nthat this context actually removed. The cache reference is then dropped\nexactly once per entry even when the invalidations run concurrently, and\nthe behavior is unchanged when only one context runs."
      },
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        "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nKVM: arm64: vgic-its: Eliminar la referencia de la caché de traducción solo para la entrada borrada\n\nvgic_its_invalidate_cache() recorre la caché de traducción por ITS con xa_for_each() y elimina la referencia de la caché en cada entrada con vgic_put_irq(). Sin embargo, libera el puntero iterado, en lugar del valor devuelto por xa_erase().\n\nLa función es llamada desde contextos que no se excluyen mutuamente: los manejadores de comandos ITS mantienen its_lock, la ruta de escritura de GITS_CTLR mantiene cmd_lock, y la ruta que borra EnableLPIs en el GICR_CTLR de un redistribuidor no mantiene ninguno. Dos o más de ellos pueden vaciar la misma caché concurrentemente, y si cada uno observa la misma entrada, la borra y luego la libera, la única referencia que la caché mantiene sobre esa entrada se elimina más de una vez. La entrada puede entonces ser liberada mientras un ITE todavía la mapea.\n\nxa_erase() es atómica y devuelve la entrada anterior, así que libera solo la entrada que este contexto realmente eliminó. La referencia de la caché se elimina entonces exactamente una vez por entrada incluso cuando las invalidaciones se ejecutan concurrentemente, y el comportamiento no cambia cuando solo se ejecuta un contexto."
      }
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    "id": "CVE-2026-46316",
    "lastModified": "2026-09-16T13:18:00.307",
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    "published": "2026-06-09T13:16:36.887",
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  "severity": "CRITICAL",
  "source": "nvd",
  "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache..."
}