CVE-2026-64218
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: bla: fix report_work leak on backbone_gw purge
batadv_bla_purge_backbone_gw() removes stale backbone gateway entries, but fails to properly handle their associated report_work:
- If report_work is running, the purge must wait for it to finish before freeing the backbone_gw, otherwise the worker may access freed memory (e.g. bat_priv).
- If report_work is pending, the purge must cancel it and release the reference held for that pending work item.
The previous implementation called hlist_for_each_entry_safe() inside a spin_lock_bh() section, but cancel_work_sync() may sleep and therefore cannot be called from within a spinlock-protected region.
Restructure the loop to handle one entry per spinlock critical section: acquire the lock, find the next entry to purge, remove it from the hash list, then release the lock before calling cancel_work_sync() and dropping the hash_entry reference. Repeat until no more entries require purging.
No affected software listed.
- https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b
- https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a
- https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb
- https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9
- https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa
- https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec
- https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707
- https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7
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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
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