High 7.8Published Jul 24, 2026

CVE-2026-64218batman-adv: bla: fix report_work leak on backbone_gw purge

Updated under an hour ago (Oct 27, 2026, 11:20 AM ET)

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 23721387c409087fd3b97e274f34d3ddc0970b74 before ce2c0ee4d76d5ee4b391fe0e31334361e25030ec; 23721387c409087fd3b97e274f34d3ddc0970b74 builds before 3423a45e5c3d3c5129f88143a9a969787d7d5a0a; from 23721387c409087fd3b97e274f34d3ddc0970b74 before f1303adb1e59582f76c22798a2e2e150e054a9e7; from 23721387c409087fd3b97e274f34d3ddc0970b74 before 48663158222b3b7f6ee6791a67d512ede7fc94bb; from 23721387c409087fd3b97e274f34d3ddc0970b74 before eeddd7bab3d59c1e98642a204141f8c5d6194707; from 23721387c409087fd3b97e274f34d3ddc0970b74 before c6de1a5a9c406e30b91f1515a6ce05cc84023baa; 23721387c409087fd3b97e274f34d3ddc0970b74 builds before 95a7034661274cf5985708bd2f6d86ee46f88fa9; 23721387c409087fd3b97e274f34d3ddc0970b74 builds before 0459430add32ea41f3e2ef9351610e6d33627a6b	CNA record
linux linux_kernel linux:linux_kernel	from 3.5 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; and 3 more ranges	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.