batman-adv: fix tp_meter counter underflow during shutdown_CVE-2026-52919

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix tp_meter counter underflow during shutdown\n\nbatadv_tp_sender_shutdown() unconditionally decrements the \"sending\"\natomic counter. If multiple paths (e.g. timeout, user cancel, and\nnormal finish) call this function, the counter can underflow to -1.\n\nSince the sender logic treats any non-zero value as \"still sending\",\na negative value causes the sender kthread to loop indefinitely.\nThis leads to a use-after-free when the interface is removed while\nthe zombie thread is still active.\n\nFix this by using atomic_xchg() to ensure the counter only transitions\nfrom 1 to 0 once.\n\n[sven: added missing change in batadv_tp_send]",
    "published": "2026-06-24T07:14:15.201Z",
    "modified": "2026-06-28T06:36:40.590Z",
    "type": "cve",
    "title": "batman-adv: fix tp_meter counter underflow during shutdown",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e75e2ab463b5b34df6b98f94d740aff327ce9f6b\nhttps://git.kernel.org/stable/c/abae88fa254f2981d39ac003a7b302528a22af64\nhttps://git.kernel.org/stable/c/c66d20a3ff095e3f000551d208ec2606616db15c\nhttps://git.kernel.org/stable/c/c1bac194733aabd731aafa6a01350c229e187dba\nhttps://git.kernel.org/stable/c/01cefc5923889e29dbb5f281c3d457714ceb9c00\nhttps://git.kernel.org/stable/c/90ae3eae06b7b8ab9f6250b9497c860915b4c17b\nhttps://git.kernel.org/stable/c/aeae11c5dad9cd0d50723890bdd866f8e6db2e7d\nhttps://git.kernel.org/stable/c/94f3b133168d1c49895e7cc6afbcf1cc0b354602",
    "id": "CVE-2026-52919",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e\nLinux Linux 4.8",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
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        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
    "vendor": "Linux",
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    "ai_score": 0
}