Bug 2401554 (CVE-2022-50490)

Summary: CVE-2022-50490 kernel: bpf: Propagate error from htab_lock_bucket() to userspace
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-04 16:07:12 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Propagate error from htab_lock_bucket() to userspace

In __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns
-EBUSY, it will go to next bucket. Going to next bucket may not only
skip the elements in current bucket silently, but also incur
out-of-bound memory access or expose kernel memory to userspace if
current bucket_cnt is greater than bucket_size or zero.

Fixing it by stopping batch operation and returning -EBUSY when
htab_lock_bucket() fails, and the application can retry or skip the busy
batch as needed.
Comment 1 Alexander B 2025-10-06 12:14:21 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100417-CVE-2022-50490-dcd3@gregkh/T