7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2024-40909: bpf: Fix a potential use-after-free in bpf_link_free()

First published: Fri Jul 12 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=6.6.26<6.6.35
Linux Linux kernel>=6.9<6.9.6
Linux Linux kernel=6.10-rc1
Linux Linux kernel=6.10-rc2
debian/linux
5.10.223-1
5.10.226-1
6.1.106-3
6.1.112-1
6.11.5-1
6.11.6-1

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