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        "text": "An update for kernel is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION.\n\nRed Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err() (CVE-2026-43037)\n\n* kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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      "cwe": {
        "id": "CWE-843",
        "name": "Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)"
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          "text": "2464351"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s IPv6 tunnel implementation. A remote attacker could exploit this flaw by sending malicious ICMPv6 error messages to cause a stack-based buffer overflow in the kernel\u0027s IPv4-over-IPv6 tunnel error handling code. This could result in a kernel crash (denial of service) or potentially allow arbitrary code execution with kernel privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Critical flaw in the Linux kernel\u0027s IPv6 tunneling error handling can lead to a stack buffer overflow. An unauthenticated remote attacker could exploit this by sending specially crafted network packets, potentially resulting in a denial of service or information disclosure on affected Red Hat Enterprise Linux systems.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "url": "https://access.redhat.com/errata/RHSA-2026:27719"
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        {
          "category": "workaround",
          "details": "Mitigation for this issue is to skip loading the affected module `ip6_tunnel` onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time.\n~~~\nHow do I blacklist a kernel module to prevent it from loading automatically? \nhttps://access.redhat.com/solutions/41278  \n~~~\n\nWe may also want to detection and monitoring an affected system as below:\n~~~\nMonitor for exploitation attempts:\n\n# Enable kernel audit for IPv6 tunnel operations\nauditctl -a always,exit -F arch=b64 -S socket -F a0=10 -F a1=3 -k ipv6_tunnel\n\n# Monitor system logs for kernel panics/crashes\njournalctl -k -p err -f | grep -i \"ip6_tunnel\\|icmp\\|stack\"\n~~~",
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()"
    },
    {
      "cve": "CVE-2026-46243",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-05-26T15:07:49.955000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2481486"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A privilege escalation vulnerability was found in the Linux kernel\u0027s CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue is classified as Important severity primarily because a low-privileged local user can achieve full privilege escalation to root without any user interaction. The attack requires local access, which prevents remote exploitation and is the primary factor keeping the rating at Important rather than Critical.\n\nExploitation requires three components to be present on the system: the `cifs` kernel module (loaded or loadable), the `cifs-utils` package with its default `cifs.spnego` request-key rule, and the ability to create unprivileged user and mount namespaces. All three must be present for the attack chain to succeed. Environments that do not use SMB/CIFS file shares or Active Directory integration are unlikely to have `cifs-utils` installed, reducing their exposure.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-46243"
        },
        {
          "category": "external",
          "summary": "RHBZ#2481486",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481486"
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          "category": "external",
          "summary": "RHSB-2026-005",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-005"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46243",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46243"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46243",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46243"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2"
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        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/",
          "url": "https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/"
        }
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      "release_date": "2026-05-26T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2026-06-22T02:46:21+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions"
    }
  ]
}