CVE-2024-40909
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2024-07-12 13:15:14.137000
Last modified
2026-10-30 13:17:29.717000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2024-07-12T13:15:14.137",
"lastModified": "2026-10-30T13:17:29.717",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a potential use-after-free in bpf_link_free()\n\nAfter commit 1a80dbcb2dba, bpf_link can be freed by\nlink->ops->dealloc_deferred, but the code still tests and uses\nlink->ops->dealloc afterward, which leads to a use-after-free as\nreported by syzbot. Actually, one of them should be sufficient, so\njust call one of them instead of both. Also add a WARN_ON() in case\nof any problematic implementation."
},
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"value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: bpf: corrige un posible use-after-free en bpf_link_free() Después del commit 1a80dbcb2dba, bpf_link se puede liberar mediante link->ops->dealloc_deferred, pero el código aún prueba y usa link->ops->dealloc después, lo que conduce a un use-after-free según lo informado por syzbot. En realidad, uno de ellos debería ser suficiente, así que llame a uno de ellos en lugar de a ambos. También agregue WARN_ON() en caso de cualquier implementación problemática."
}
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