{"id":"CVE-2026-64218","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix report_work leak on backbone_gw purge\n\nbatadv_bla_purge_backbone_gw() removes stale backbone gateway entries,\nbut fails to properly handle their as…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix report_work leak on backbone_gw purge\n\nbatadv_bla_purge_backbone_gw() removes stale backbone gateway entries,\nbut fails to properly handle their as…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-07-24","updated":"2026-07-27","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64218","references":[{"url":"https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64218.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64218"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506786"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64218"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64218"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072415-CVE-2026-64218-ea1d@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.0013,"epssPercentile":0.02976,"ingestedAt":"2026-07-27T06:16:49.109Z","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","affected":["enterprise_linux 10","enterprise_linux_for_nvidia 26","openshift_container_platform 4"],"cwe":["CWE-825"],"slug":"CVE-2026-64218","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix report_work leak on backbone_gw purge\n\nbatadv_bla_purge_backbone_gw() removes stale backbone gateway entries,\nbut fails to properly handle their associated report_work:\n\n- If report_work is running, the purge must wait for it to finish before\n  freeing the backbone_gw, otherwise the worker may access freed memory\n  (e.g. bat_priv).\n- If report_work is pending, the purge must cancel it and release the\n  reference held for that pending work item.\n\nThe previous implementation called hlist_for_each_entry_safe() inside a\nspin_lock_bh() section, but cancel_work_sync() may sleep and therefore\ncannot be called from within a spinlock-protected region.\n\nRestructure the loop to handle one entry per spinlock critical section:\nacquire the lock, find the next entry to purge, remove it from the hash\nlist, then release the lock before calling cancel_work_sync() and\ndropping the hash_entry reference. Repeat until no more entries require\npurging.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux for NVIDIA 26, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux for NVIDIA 26, Red Hat Enterprise Linux 10, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64218.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}