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Vulnerability record · CVE-2026-64218 · published 24 July 2026

CVE-2026-64218: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.7%
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
11 Aug 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b Patch
https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a Patch
https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb Patch
https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9 Patch
https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa Patch
https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec Patch
https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707 Patch
https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64218), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.