CVE-2025-71161
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: dm-verity: disable recursive forward error correction There are two problems with the recursive correction: 1. It may cause denial-of-service. In fec_read_bufs, there is a loop that has 253 iterations. For each iteration, we may call verity_hash_for_block recursively. There is a limit of 4 nested recursions - that means that there may be at most 253^4 (4 billion) iterations. Red Hat QE team actually created an image that pushes dm-verity to this limit - and this image just makes the udev-worker process get stuck in the 'D' state. 2. It doesn't work. In fec_read_bufs we store data into the variable "fio->bufs", but fio bufs is shared between recursive invocations, if "verity_hash_for_block" invoked correction recursively, it would overwrite partially filled fio->bufs.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-01-23 16:15:53
Last modified
2026-10-19 19:17:15.753000
View original CVE JSON
{
"id": "CVE-2025-71161",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-01-23T16:15:53.000",
"lastModified": "2026-10-19T19:17:15.753",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there is a loop that\nhas 253 iterations. For each iteration, we may call verity_hash_for_block\nrecursively. There is a limit of 4 nested recursions - that means that\nthere may be at most 253^4 (4 billion) iterations. Red Hat QE team\nactually created an image that pushes dm-verity to this limit - and this\nimage just makes the udev-worker process get stuck in the 'D' state.\n\n2. It doesn't work. In fec_read_bufs we store data into the variable\n\"fio->bufs\", but fio bufs is shared between recursive invocations, if\n\"verity_hash_for_block\" invoked correction recursively, it would\noverwrite partially filled fio->bufs."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm-verity: deshabilitar la corrección de errores hacia adelante recursiva\n\nHay dos problemas con la corrección recursiva:\n\n1. Puede causar una denegación de servicio. En fec_read_bufs, hay un bucle que tiene 253 iteraciones. Para cada iteración, podemos llamar a verity_hash_for_block recursivamente. Hay un límite de 4 recursiones anidadas, lo que significa que puede haber como máximo 253^4 (4 mil millones) iteraciones. El equipo de QE de Red Hat creó una imagen que lleva a dm-verity a este límite, y esta imagen simplemente hace que el proceso udev-worker se quede atascado en el estado 'D'.\n\n2. No funciona. En fec_read_bufs almacenamos datos en la variable 'fio->bufs', pero fio bufs se comparte entre invocaciones recursivas; si 'verity_hash_for_block' invocara la corrección recursivamente, sobrescribiría los fio->bufs parcialmente llenos."
}
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