netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check_CVE-2026-52998

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix potential NULL dereference in ttl check\n\nThe nf_osf_ttl() function accessed skb->dev to perform a local interface\naddress lookup without verifying that the device pointer was valid.\n\nAdditionally, the implementation utilized an in_dev_for_each_ifa_rcu\nloop to match the packet source address against local interface\naddresses. It assumed that packets from the same subnet should not see a\ndecrement on the initial TTL. A packet might appear it is from the same\nsubnet but it actually isn't especially in modern environments with\ncontainers and virtual switching.\n\nRemove the device dereference and interface loop. Replace the logic with\na switch statement that evaluates the TTL according to the ttl_check.",
    "published": "2026-06-24T16:29:10.874Z",
    "modified": "2026-06-28T06:37:48.038Z",
    "type": "cve",
    "title": "netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/f4de0777e4554a7de19c920accde6319dd530782\nhttps://git.kernel.org/stable/c/c996a90f3071cf43683e5423da31aadbe002b8b4\nhttps://git.kernel.org/stable/c/edc806f9122961f0d3819f7c69c14cccde31f277\nhttps://git.kernel.org/stable/c/5d05de2f0928d81309a815ecc76d1a3ad72cbc16\nhttps://git.kernel.org/stable/c/95be653a76793856ff8b2d8bd82c2943c23f5ca8\nhttps://git.kernel.org/stable/c/79b90a96688e521771fa6ed3dc7864b76b8df293\nhttps://git.kernel.org/stable/c/83fc5dd63455a779ea2dd0f7ffee3c920919d80b\nhttps://git.kernel.org/stable/c/711987ba281fd806322a7cd244e98e2a81903114",
    "id": "CVE-2026-52998",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384\nLinux Linux 2.6.31",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}