CVE-2026-64218

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Repeat until no more entries require\npurging."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Although mesh packets can enqueue report_work, exploitation requires purging or tearing down the mesh object, which a local attacker can perform through netlink in a controlled network namespace.\nAC:L - The attacker can observe the periodic loop-detect address, enqueue many VLAN-specific work items, and immediately delete the interface, controlling both sides of the race.\nPR:L - Mesh configuration and teardown require CAP_NET_ADMIN, but batman-adv supports network namespaces and GENL_UNS_ADMIN_PERM, making the path reachable by an otherwise unprivileged user through user namespaces.\nUI:N - The attacker can create, trigger, and tear down the affected mesh interface without action from another user.\nS:U - Exploitation compromises the host kernel within its existing security authority; this is standard kernel privilege escalation rather than a VM or hardware-boundary escape.\nC:H - The worker can dereference a freed bat_priv, net_device, and embedded kobject; controlled reallocation can turn these stale pointer chains into kernel-memory disclosure primitives.\nI:H - The use-after-free reaches kobject uevent processing and stale callback-bearing structures, making heap reuse and control-flow hijacking or arbitrary kernel modification plausible.\nA:H - The stale net_device and kobject dereferences can cause a kernel oops or panic, and an attacker can repeat the trigger through user-namespace-created mesh interfaces."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/bridge_loop_avoidance.c"], "versions": [{"version": "23721387c409087fd3b97e274f34d3ddc0970b74", "lessThan": 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"https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707"}, {"url": "https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa"}, {"url": "https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9"}, {"url": "https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b"}], "title": "batman-adv: bla: fix report_work leak on backbone_gw purge", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.175", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.142", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.92", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "87228D43-E81A-4C73-9457-94467C1D5AB5", "versionEndExcluding": "5.10.258", "versionStartIncluding": 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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."}], "id": "CVE-2026-64218", "lastModified": "2026-08-11T18:26:37.047", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-24T16:16:49.520", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: bla: fix report_work leak on backbone_gw purge", "id": "2506786", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506786"}, "csaw": false, "cwe": "CWE-825", "details": ["No description is available for this CVE."], "name": "CVE-2026-64218", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "impact": "moderate", "package_name": "libkrun", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "moderate", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "impact": "moderate", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64218\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64218\nhttps://lore.kernel.org/linux-cve-announce/2026072415-CVE-2026-64218-ea1d@gregkh/T"]}

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