netconsole: avoid OOB reads, msg is not nul-terminated_CVE-2026-43197

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetconsole: avoid OOB reads, msg is not nul-terminated\n\nmsg passed to netconsole from the console subsystem is not guaranteed\nto be nul-terminated. Before recent\ncommit 7eab73b18630 (\"netconsole: convert to NBCON console infrastructure\")\nthe message would be placed in printk_shared_pbufs, a static global\nbuffer, so KASAN had harder time catching OOB accesses. Now we see:\n\n    printk: console [netcon_ext0] enabled\n    BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240\n    Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594\n\n    CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9\n    Call Trace:\n     kasan_report+0xe4/0x120\n     string+0x1f7/0x240\n     vsnprintf+0x655/0xba0\n     scnprintf+0xba/0x120\n     netconsole_write+0x3fe/0xa10\n     nbcon_emit_next_record+0x46e/0x860\n     nbcon_kthread_func+0x623/0x750\n\n    Allocated by task 1:\n     nbcon_alloc+0x1ea/0x450\n     register_console+0x26b/0xe10\n     init_netconsole+0xbb0/0xda0\n\n    The buggy address belongs to the object at ffff88813b6d4000\n                which belongs to the cache kmalloc-4k of size 4096\n    The buggy address is located 0 bytes to the right of\n                allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)",
    "published": "2026-05-06T11:28:04.829Z",
    "modified": "2026-05-08T12:41:09.303Z",
    "type": "cve",
    "title": "netconsole: avoid OOB reads, msg is not nul-terminated",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/3126a2f98beaec5a554a1fb31c46db1e8542665e\nhttps://git.kernel.org/stable/c/74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58\nhttps://git.kernel.org/stable/c/82aec772fca2223bc5774bd9af486fd95766e578",
    "id": "CVE-2026-43197",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux c62c0a17f9b7398022f9eebe547878033264f81f\nLinux Linux c62c0a17f9b7398022f9eebe547878033264f81f\nLinux Linux c62c0a17f9b7398022f9eebe547878033264f81f\nLinux Linux 6.6",
    "sourceHref": "",
    "cvss": {
        "score": 9.1,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "c62c0a17f9b7398022f9eebe547878033264f81f",
    "vendor": "Linux",
    "ai_description": "Out-of-bounds read in netconsole due to non-nul-terminated message",
    "ai_severity": "Critical",
    "ai_vendor": "Linux",
    "ai_product": "Linux Kernel",
    "ai_version": "6.6, c62c0a17f9b7398022f9eebe547878033264f81f",
    "ai_score": 9.1
}