CVE-2023-53694

{
  "id": "CVE-2023-53694",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-22T14:15:43.887",
  "lastModified": "2026-10-28T19:10:00.193",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ftrace: Fixup panic by disabling preemption\n\nIn RISCV, we must use an AUIPC + JALR pair to encode an immediate,\nforming a jump that jumps to an address over 4K. This may cause errors\nif we want to enable kernel preemption and remove dependency from\npatching code with stop_machine(). For example, if a task was switched\nout on auipc. And, if we changed the ftrace function before it was\nswitched back, then it would jump to an address that has updated 11:0\nbits mixing with previous XLEN:12 part.\n\np: patched area performed by dynamic ftrace\nftrace_prologue:\np|      REG_S   ra, -SZREG(sp)\np|      auipc   ra, 0x? ------------> preempted\n\t\t\t\t\t...\n\t\t\t\tchange ftrace function\n\t\t\t\t\t...\np|      jalr    -?(ra) <------------- switched back\np|      REG_L   ra, -SZREG(sp)\nfunc:\n\txxx\n\tret"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nriscv: ftrace: Corregir pánico deshabilitando la preemption\n\nEn RISCV, debemos usar un par AUIPC + JALR para codificar un inmediato, formando un salto que salta a una dirección de más de 4K. Esto puede causar errores si queremos habilitar la preemption del kernel y eliminar la dependencia de parchear código con stop_machine(). Por ejemplo, si una tarea fue conmutada en auipc. Y, si cambiamos la función ftrace antes de que fuera conmutada de nuevo, entonces saltaría a una dirección que tiene bits 11:0 actualizados mezclándose con la parte XLEN:12 anterior.\n\np: área parcheada realizada por ftrace dinámico\nftrace_prologue:\np|      REG_S   ra, -SZREG(sp)\np|      auipc   ra, 0x? ------------> interrumpida\n\t\t\t\t\t...\n\t\t\t\tcambiar función ftrace\n\t\t\t\t\t...\np|      jalr    -?(ra)   <-  ------------ conmutada de nuevo\np|      REG_L   ra, -SZREG(sp)\nfunc:\n\txxx\n\tret"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/riscv/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "afc76b8b80112189b6f11e67e19cf58301944814",
              "lessThan": "84cfcf240f4a577733b1d98fcd2611a611612b03",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "afc76b8b80112189b6f11e67e19cf58301944814",
              "lessThan": "20a7510e781084364691b4962de31de758194cc9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "afc76b8b80112189b6f11e67e19cf58301944814",
              "lessThan": "8547649981e6631328cd64f583667501ae385531",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/riscv/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.12",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.12",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.23",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.2.3",
              "lessThanOrEqual": "6.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/20a7510e781084364691b4962de31de758194cc9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/84cfcf240f4a577733b1d98fcd2611a611612b03",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8547649981e6631328cd64f583667501ae385531",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}