CVE-2024-53142

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

initramfs: avoid filename buffer overrun

The initramfs filename field is defined in Documentation/driver-api/early-userspace/buffer-format.rst as:

37 cpio_file := ALGN(4) + cpio_header + filename + "\0" + ALGN(4) + data ... 55 ============= ================== ========================= 56 Field name Field size Meaning 57 ============= ================== ========================= ... 70 c_namesize 8 bytes Length of filename, including final \0

When extracting an initramfs cpio archive, the kernel's do_name() path handler assumes a zero-terminated path at @collected, passing it directly to filp_open() / init_mkdir() / init_mknod().

Leer descripción completaMostrar menos

If a specially crafted cpio entry carries a non-zero-terminated filename and is followed by uninitialized memory, then a file may be created with trailing characters that represent the uninitialized memory. The ability to create an initramfs entry would imply already having full control of the system, so the buffer overrun shouldn't be considered a security vulnerability.

Append the output of the following bash script to an existing initramfs and observe any created /initramfs_test_fname_overrunAA* path. E.g. ./reproducer.sh | gzip >> /myinitramfs

It's easiest to observe non-zero uninitialized memory when the output is gzipped, as it'll overflow the heap allocated @out_buf in __gunzip(), rather than the initrd_start+initrd_size block.

---- reproducer.sh ---- nilchar="A" # change to "\0" to properly zero terminate / pad magic="070701" ino=1 mode=$(( 0100777 )) uid=0 gid=0 nlink=1 mtime=1 filesize=0 devmajor=0 devminor=1 rdevmajor=0 rdevminor=0 csum=0 fname="initramfs_test_fname_overrun" namelen=$(( ${#fname} + 1 )) # plus one to account for terminator

termpadlen=$(( 1 + ((4 - ((110 + $namelen) & 3)) % 4) )) printf "%.s${nilchar}" $(seq 1 $termpadlen) ---- reproducer.sh ----

Symlink filename fields handled in do_symlink() won't overrun past the data segment, due to the explicit zero-termination of the symlink target.

Fix filename buffer overrun by aborting the initramfs FSM if any cpio entry doesn't carry a zero-terminator at the expected (name_len - 1) offset.

Detalles técnicos trazas, registros y código del informe original

printf "%s%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%s" \
	$magic $ino $mode $uid $gid $nlink $mtime $filesize \
	$devmajor $devminor $rdevmajor $rdevminor $namelen $csum $fname

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.25%
Percentil entre todas las CVEs puntuadas: 15
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution70 %

Escalada local sin interacción (AV:L, PR:L, UI:N) en kernel Linux mediante buffer overrun en initramfs que permite ejecución de código arbitrario con privilegios elevados (C:H, I:H, A:H).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787

Referencias

JSON original (NVD)

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninitramfs: avoid filename buffer overrun\n\nThe initramfs filename field is defined in\nDocumentation/driver-api/early-userspace/buffer-format.rst as:\n\n 37 cpio_file := ALGN(4) + cpio_header + filename + \"\\0\" + ALGN(4) + data\n...\n 55 ============= ================== =========================\n 56 Field name    Field size         Meaning\n 57 ============= ================== =========================\n...\n 70 c_namesize    8 bytes            Length of filename, including final \\0\n\nWhen extracting an initramfs cpio archive, the kernel's do_name() path\nhandler assumes a zero-terminated path at @collected, passing it\ndirectly to filp_open() / init_mkdir() / init_mknod().\n\nIf a specially crafted cpio entry carries a non-zero-terminated filename\nand is followed by uninitialized memory, then a file may be created with\ntrailing characters that represent the uninitialized memory. The ability\nto create an initramfs entry would imply already having full control of\nthe system, so the buffer overrun shouldn't be considered a security\nvulnerability.\n\nAppend the output of the following bash script to an existing initramfs\nand observe any created /initramfs_test_fname_overrunAA* path. E.g.\n  ./reproducer.sh | gzip >> /myinitramfs\n\nIt's easiest to observe non-zero uninitialized memory when the output is\ngzipped, as it'll overflow the heap allocated @out_buf in __gunzip(),\nrather than the initrd_start+initrd_size block.\n\n---- reproducer.sh ----\nnilchar=\"A\"\t# change to \"\\0\" to properly zero terminate / pad\nmagic=\"070701\"\nino=1\nmode=$(( 0100777 ))\nuid=0\ngid=0\nnlink=1\nmtime=1\nfilesize=0\ndevmajor=0\ndevminor=1\nrdevmajor=0\nrdevminor=0\ncsum=0\nfname=\"initramfs_test_fname_overrun\"\nnamelen=$(( ${#fname} + 1 ))\t# plus one to account for terminator\n\nprintf \"%s%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%s\" \\\n\t$magic $ino $mode $uid $gid $nlink $mtime $filesize \\\n\t$devmajor $devminor $rdevmajor $rdevminor $namelen $csum $fname\n\ntermpadlen=$(( 1 + ((4 - ((110 + $namelen) & 3)) % 4) ))\nprintf \"%.s${nilchar}\" $(seq 1 $termpadlen)\n---- reproducer.sh ----\n\nSymlink filename fields handled in do_symlink() won't overrun past the\ndata segment, due to the explicit zero-termination of the symlink\ntarget.\n\nFix filename buffer overrun by aborting the initramfs FSM if any cpio\nentry doesn't carry a zero-terminator at the expected (name_len - 1)\noffset."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: initramfs: evitar el desbordamiento del búfer del nombre de archivo El campo de nombre de archivo de initramfs se define en Documentation/driver-api/early-userspace/buffer-format.rst como: 37 cpio_file := ALGN(4) + cpio_header + filename + \"\\0\" + ALGN(4) + data ... 55 ============== =================== ========================== 56 Nombre de campo Tamaño del campo Significado 57 ============= =================== ========================== ... 70 c_namesize 8 bytes Longitud del nombre de archivo, final \\0 Al extraer un archivo cpio de initramfs, el manejador de ruta do_name() del núcleo asume una ruta terminada en cero en @collected, pasándola directamente a filp_open() / init_mkdir() / init_mknod(). Si una entrada cpio especialmente diseñada lleva un nombre de archivo que no termina en cero y es seguida por memoria no inicializada, entonces se puede crear un archivo con caracteres finales que representan la memoria no inicializada. La capacidad de crear una entrada initramfs implicaría ya tener control total del sistema, por lo que el desbordamiento del búfer no debería considerarse una vulnerabilidad de seguridad. Adjunte la salida del siguiente script bash a un initramfs existente y observe cualquier ruta /initramfs_test_fname_overrunAA* creada. Por ejemplo, ./reproducer.sh | Es más fácil observar memoria no inicializada distinta de cero cuando se comprime la salida, ya que desbordará el montón asignado @out_buf en __gunzip(), en lugar del bloque initrd_start+initrd_size. ---- reproducter.sh ---- nilchar=\"A\" # cambia a \"\\0\" para terminar correctamente en cero / rellenar magic=\"070701\" ino=1 mode=$(( 0100777 )) uid=0 gid=0 nlink=1 mtime=1 filesize=0 devmajor=0 devminor=1 rdevmajor=0 rdevminor=0 csum=0 fname=\"initramfs_test_fname_overrun\" namelen=$(( ${#fname} + 1 )) # más uno para tener en cuenta el terminador printf \"%s%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%s\" \\ $magic $ino $mode $uid $gid $nlink $mtime $filesize \\ $devmajor $devminor $rdevmajor $rdevminor $namelen $csum $fname termpadlen=$(( 1 + ((4 - ((110 + $namelen) &amp; 3)) % 4) )) printf \"%.s${nilchar}\" $(seq 1 $termpadlen) ---- reproducer.sh ---- Los campos de nombre de archivo de enlace simbólico manejados en do_symlink() no se desbordarán más allá del segmento de datos, debido a la terminación explícita en cero del objetivo del enlace simbólico. Corrija el desbordamiento del búfer de nombre de archivo abortando el FSM initramfs si alguna entrada cpio no lleva un terminador en cero en el desplazamiento esperado (name_len - 1)."
    }
  ],
  "lastModified": "2026-06-17T08:08:24.340",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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