xfrm6: fix uninitialized saddr in xfrm6_get_saddr()_CVE-2026-43139

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\n\nxfrm6_get_saddr() does not check the return value of\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\nsource address (returns -EADDRNOTAVAIL), saddr->in6 is left\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\n\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\naddress in xfrm_state_find(), triggering KMSAN warning:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\n xfrm_state_find+0x2424/0xa940\n xfrm_resolve_and_create_bundle+0x906/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x2ce1/0x3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x332b/0x3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n=====================================================\n\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\nthe error.",
    "published": "2026-05-06T11:27:24.898Z",
    "modified": "2026-05-08T12:40:50.383Z",
    "type": "cve",
    "title": "xfrm6: fix uninitialized saddr in xfrm6_get_saddr()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea\nhttps://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa\nhttps://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b\nhttps://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f\nhttps://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787\nhttps://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b\nhttps://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7\nhttps://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05",
    "id": "CVE-2026-43139",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux a1e59abf824969554b90facd44a4ab16e265afa4\nLinux Linux 2.6.19",
    "sourceHref": "",
    "cvss": {
        "score": 8.6,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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": "",
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            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a1e59abf824969554b90facd44a4ab16e265afa4",
    "vendor": "Linux",
    "ai_description": "AI processing failed - invalid JSON response",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}