{"id":"CVE-2026-64218","summary":"batman-adv: bla: fix report_work leak on backbone_gw purge","details":"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 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.","modified":"2026-07-28T04:02:21.592508332Z","published":"2026-07-24T15:23:05.814Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64218.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64218.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64218"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"23721387c409087fd3b97e274f34d3ddc0970b74"},{"fixed":"ce2c0ee4d76d5ee4b391fe0e31334361e25030ec"},{"fixed":"3423a45e5c3d3c5129f88143a9a969787d7d5a0a"},{"fixed":"f1303adb1e59582f76c22798a2e2e150e054a9e7"},{"fixed":"48663158222b3b7f6ee6791a67d512ede7fc94bb"},{"fixed":"eeddd7bab3d59c1e98642a204141f8c5d6194707"},{"fixed":"c6de1a5a9c406e30b91f1515a6ce05cc84023baa"},{"fixed":"95a7034661274cf5985708bd2f6d86ee46f88fa9"},{"fixed":"0459430add32ea41f3e2ef9351610e6d33627a6b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64218.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.5.0"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64218.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}