CVE-2024-50043
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix possible badness in FREE_STATEID When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors. In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2024-10-21 20:15:17.263000
Last modified
2026-10-21 13:17:49.880000
View original CVE JSON
{
"id": "CVE-2024-50043",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-10-21T20:15:17.263",
"lastModified": "2026-10-21T13:17:49.880",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix possible badness in FREE_STATEID\n\nWhen multiple FREE_STATEIDs are sent for the same delegation stateid,\nit can lead to a possible either use-after-free or counter refcount\nunderflow errors.\n\nIn nfsd4_free_stateid() under the client lock we find a delegation\nstateid, however the code drops the lock before calling nfs4_put_stid(),\nthat allows another FREE_STATE to find the stateid again. The first one\nwill proceed to then free the stateid which leads to either\nuse-after-free or decrementing already zeroed counter."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: corregir posible maldad en FREE_STATEID Cuando se envían múltiples FREE_STATEID para el mismo stateid de delegación, puede conducir a un posible error de subdesbordamiento de contador o de use after free. En nfsd4_free_stateid() bajo el bloqueo del cliente encontramos un stateid de delegación, sin embargo, el código elimina el bloqueo antes de llamar a nfs4_put_stid(), que permite que otro FREE_STATE encuentre el stateid nuevamente. El primero procederá a liberar el stateid, lo que conduce a un use after free o a la disminución del contador ya puesto a cero."
}
],
"affected": [
{
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"affectedData": [
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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"id": "CVE-2024-50043",
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"source": "[email protected]",
"type": "Primary",
"description": [
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