{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46208","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.105Z","datePublished":"2026-05-28T09:40:26.341Z","dateUpdated":"2026-08-05T12:30:29.443Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:30:29.443Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: stop tp_meter sessions during mesh teardown\n\nTP meter sessions remain linked on bat_priv->tp_list after the netlink\nrequest has already finished. When the mesh interface is removed,\nbatadv_mesh_free() currently tears down the mesh without first draining\nthese sessions.\n\nA running sender thread or a late incoming tp_meter packet can then keep\nprocessing against a mesh instance which is already shutting down.\nSynchronize tp_meter with the mesh lifetime by stopping all active\nsessions from batadv_mesh_free() and waiting for sender threads to exit\nbefore teardown continues."}],"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 - The controllable trigger is the local `BATADV_CMD_TP_METER` netlink command plus local interface teardown (rtnetlink); the \"late packet\" receiver path is not remotely controllable since the remote peer cannot drive the victim's teardown timing.\nAC:L - The attacker controls both sides of the race—starting a session with an attacker-chosen `test_length` (default 10s) keeps the sender thread/receiver timer alive, then removing the interface triggers the free—giving a large, reliably winnable window.\nPR:L - The tp_meter netlink op is `GENL_UNS_ADMIN_PERM`, i.e. CAP_NET_ADMIN checked against the netns owner's user namespace, which an unprivileged user obtains via `unshare -Urn`.\nUI:N - Both the session start and the mesh teardown are performed by the attacker; no victim interaction is required.\nS:U - The corruption stays within the kernel's own memory/security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free on the netdev private data lets the attacker control freed-object contents and read adjacent/reallocated kernel memory.\nI:H - The freed `bat_priv` object can be reclaimed via heap spraying, yielding a write/control-flow-hijack primitive from the still-running sender thread and receiver timer.\nA:H - The use-after-free reliably causes a kernel oops/panic when the stale `bat_priv` and mesh tables are dereferenced after `free_netdev()`."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/main.c","net/batman-adv/tp_meter.c","net/batman-adv/tp_meter.h","net/batman-adv/types.h"],"versions":[{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"5e7d0ac936354c36810e74ac3056b334ed1f4058","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"268078acae72daa12b17b2b299701cb9924e469a","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"58943b7ea356294749dae3e75b96c0ee292c00be","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"79bc0eaeef2c5797317bf2da8e3159a74d62ec47","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"26dfeee8db81354bfdade155f27f9e16510ad196","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"03660dab86f93319178a24667f6998526dc4355d","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"8634c1dbd73adb74d40533ebb7e914efb82e71fb","status":"affected","versionType":"git"},{"version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","lessThan":"3d3cf6a7314aca4df0a6dde28ce784a2a30d0166","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/main.c","net/batman-adv/tp_meter.c","net/batman-adv/tp_meter.h","net/batman-adv/types.h"],"versions":[{"version":"4.8","status":"affected"},{"version":"0","lessThan":"4.8","status":"unaffected","versionType":"semver"},{"version":"5.10.259","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.210","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.176","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":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.176"},{"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/5e7d0ac936354c36810e74ac3056b334ed1f4058"},{"url":"https://git.kernel.org/stable/c/268078acae72daa12b17b2b299701cb9924e469a"},{"url":"https://git.kernel.org/stable/c/58943b7ea356294749dae3e75b96c0ee292c00be"},{"url":"https://git.kernel.org/stable/c/79bc0eaeef2c5797317bf2da8e3159a74d62ec47"},{"url":"https://git.kernel.org/stable/c/26dfeee8db81354bfdade155f27f9e16510ad196"},{"url":"https://git.kernel.org/stable/c/03660dab86f93319178a24667f6998526dc4355d"},{"url":"https://git.kernel.org/stable/c/8634c1dbd73adb74d40533ebb7e914efb82e71fb"},{"url":"https://git.kernel.org/stable/c/3d3cf6a7314aca4df0a6dde28ce784a2a30d0166"}],"title":"batman-adv: stop tp_meter sessions during mesh teardown","x_generator":{"engine":"bippy-1.2.0"}}}}