CVE-2026-46206

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This is a teardown race, but a local attacker controls both sides \u2014 repeatedly creating/destroying the soft interface (driving mesh_free/batadv_tp_stop_all) in one thread while starting tp_meter sessions in another \u2014 and can retry the loop indefinitely until the window is won.\nPR:L - TP_METER is gated by GENL_UNS_ADMIN_PERM (namespaced CAP_NET_ADMIN), which an unprivileged user obtains via `unshare -Urn`, then creates their own batadv mesh interface; no real root is required.\nUI:N - The attacker drives both the session start and the interface teardown themselves; no action by any other user is needed.\nS:U - The use-after-free corrupts kernel heap objects within the kernel's own security authority; there is no crossing of a VM/IOMMU/sandbox boundary.\nC:H - The surviving session holds a dangling pointer to freed tp_vars/bat_priv memory; reclaiming and reading that freed object enables disclosure of kernel memory contents.\nI:H - The use-after-free permits heap spraying of the freed object and a controlled write through the stale timer/kthread/work references, enabling memory corruption and potential control-flow hijack.\nA:H - A timer/kthread/delayed work operating on freed mesh structures reliably triggers an oops/panic, crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/tp_meter.c"], "versions": [{"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "0a7a840074c9ca5ebffc9c52358c8ea55828ec71", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "dcff44644bb518598b1a6be722706d6174b2f6a1", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "52e6ec3e972cf27792cc1559874dbee19f286869", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "ff93f86ecbb50a4709c403fc279a396e308edde5", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "e1e2194cc725ec1d41f9412496212f0fa0519c36", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "ca39545cf07c142b39d474a1439a046bf28def3d", "status": "affected", "versionType": "git"}, {"version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e", "lessThan": "3243543592425beec83d453793e9d27caa0d8e66", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/tp_meter.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.9", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.90"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.32"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.0.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0a7a840074c9ca5ebffc9c52358c8ea55828ec71"}, {"url": "https://git.kernel.org/stable/c/dcff44644bb518598b1a6be722706d6174b2f6a1"}, {"url": "https://git.kernel.org/stable/c/52e6ec3e972cf27792cc1559874dbee19f286869"}, {"url": "https://git.kernel.org/stable/c/e4a3c4a4c8f6efd243c3e448c05b7bebcbf7b3b6"}, {"url": "https://git.kernel.org/stable/c/ff93f86ecbb50a4709c403fc279a396e308edde5"}, {"url": "https://git.kernel.org/stable/c/e1e2194cc725ec1d41f9412496212f0fa0519c36"}, {"url": "https://git.kernel.org/stable/c/ca39545cf07c142b39d474a1439a046bf28def3d"}, {"url": "https://git.kernel.org/stable/c/3243543592425beec83d453793e9d27caa0d8e66"}], "title": "batman-adv: reject new tp_meter sessions during teardown", "x_generator": {"engine": "bippy-1.2.0"}}}}

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BATADV_MESH_ACTIVE."}], "id": "CVE-2026-46206", "lastModified": "2026-06-17T10:53:16.530", "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": "2026-05-28T10:16:36.243", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0a7a840074c9ca5ebffc9c52358c8ea55828ec71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3243543592425beec83d453793e9d27caa0d8e66"}, {"source": 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"weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: reject new tp_meter sessions during teardown", "id": "2482530", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482530"}, "csaw": false, "cwe": "CWE-372", "details": ["A flaw was found in the Linux kernel's `batman-adv` module, specifically in the `tp_meter` component. This vulnerability allows `tp_meter` to initiate new sender or receiver sessions even after the mesh state has exited `BATADV_MESH_ACTIVE`. This improper state management could lead to unexpected behavior or instability within the network mesh."], "name": "CVE-2026-46206", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46206\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46206\nhttps://lore.kernel.org/linux-cve-announce/2026052833-CVE-2026-46206-23e4@gregkh/T"]}

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