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        "text": "An update for kernel is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.\n\nRed Hat Product Security has rated this update as having a security impact of Important. 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: geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)\n\n* kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats (CVE-2025-68800)\n\n* kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)\n\n* kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)\n\n* kernel: netfilter: ctnetlink: ensure safe access to master conntrack (CVE-2026-43116)\n\n* kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)\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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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: geneve: Fix use-after-free in geneve_find_dev()."
    },
    {
      "cve": "CVE-2025-68800",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-01-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2429065"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats\n\nCited commit added a dedicated mutex (instead of RTNL) to protect the\nmulticast route list, so that it will not change while the driver\nperiodically traverses it in order to update the kernel about multicast\nroute stats that were queried from the device.\n\nOne instance of list entry deletion (during route replace) was missed\nand it can result in a use-after-free [1].\n\nFix by acquiring the mutex before deleting the entry from the list and\nreleasing it afterwards.\n\n[1]\nBUG: KASAN: slab-use-after-free in mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\nRead of size 8 at addr ffff8881523c2fa8 by task kworker/2:5/22043\n\nCPU: 2 UID: 0 PID: 22043 Comm: kworker/2:5 Not tainted 6.18.0-rc1-custom-g1a3d6d7cd014 #1 PREEMPT(full)\nHardware name: Mellanox Technologies Ltd. MSN2010/SA002610, BIOS 5.6.5 08/24/2017\nWorkqueue: mlxsw_core mlxsw_sp_mr_stats_update [mlxsw_spectrum]\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xba/0x110\n print_report+0x174/0x4f5\n kasan_report+0xdf/0x110\n mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nAllocated by task 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n mlxsw_sp_mr_route_add+0xd8/0x4770 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30\n\nFreed by task 29933:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_save_free_info+0x3b/0x70\n __kasan_slab_free+0x43/0x70\n kfree+0x14e/0x700\n mlxsw_sp_mr_route_add+0x2dea/0x4770 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:444 [mlxsw_spectrum]\n mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]\n process_one_work+0x9cc/0x18e0\n worker_thread+0x5df/0xe40\n kthread+0x3b8/0x730\n ret_from_fork+0x3e9/0x560\n ret_from_fork_asm+0x1a/0x30",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A use-after-free exists in mlxsw_spectrum multicast routing when a route entry is deleted from the multicast route list without holding route_list_lock, while the periodic stats worker traverses the same list. A privileged attacker who can manipulate multicast routes on a host using mlxsw Spectrum hardware can trigger the race to crash the kernel and potentially corrupt memory.",
          "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"
        }
      ],
      "product_status": {
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-68800"
        },
        {
          "category": "external",
          "summary": "RHBZ#2429065",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429065"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-68800",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-68800"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68800",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68800"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026011307-CVE-2025-68800-39d2@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026011307-CVE-2025-68800-39d2@gregkh/T"
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      "release_date": "2026-01-13T00:00:00+00:00",
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          "date": "2026-06-17T13:24:34+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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      "title": "kernel: mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats"
    },
    {
      "cve": "CVE-2026-23243",
      "cwe": {
        "id": "CWE-131",
        "name": "Incorrect Calculation of Buffer Size"
      },
      "discovery_date": "2026-03-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2448594"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Remote Direct Memory Access (RDMA) `umad` (User Mode Access Device) component. A local user can exploit this vulnerability by manipulating input, causing an integer underflow that leads to an out-of-bounds memory write. This memory corruption can result in a denial of service (DoS) by crashing the system, and may also lead to limited information disclosure or data integrity issues.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: Denial of service and memory corruption in RDMA umad",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This bug is a kernel out-of-bounds write in the RDMA umad write path caused by a user-controlled length calculation that could underflow and pass an invalid data_len into MAD send buffer creation.\nA local user with access to the umad interface can trigger the issue by supplying mismatched MAD and RMPP header sizes, which leads to an out-of-bounds memset in the send MAD allocation path and can corrupt kernel memory.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-23243"
        },
        {
          "category": "external",
          "summary": "RHBZ#2448594",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448594"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-23243",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-23243"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23243",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23243"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23243-b88e@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026031816-CVE-2026-23243-b88e@gregkh/T"
        }
      ],
      "release_date": "2026-03-18T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2026-06-17T13:24:34+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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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
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          "details": "Moderate"
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      "title": "kernel: Linux kernel: Denial of service and memory corruption in RDMA umad"
    },
    {
      "cve": "CVE-2026-23392",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
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      "discovery_date": "2026-03-25T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2451218"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s netfilter component, specifically within the nf_tables subsystem. An error in releasing a flowtable after an RCU (Read-Copy-Update) grace period could lead to a use-after-free vulnerability. This issue could expose the flowtable to the packet path and nfnetlink_hook control plane, potentially allowing a local attacker to cause a system crash (Denial of Service) or achieve arbitrary code execution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: netfilter: nf_tables: release flowtable after rcu grace period on error",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw affects nftables flowtable configurations. When flowtable setup fails (max hooks reached, hardware offload failure, or duplicate device), the error path frees the flowtable without synchronize_rcu(), allowing concurrent access from packet path or nfnetlink_hook. KASAN detected this as UAF during hook dumping.",
          "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/security/cve/CVE-2026-23392"
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        {
          "category": "external",
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-23392",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-23392"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23392",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23392"
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        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026032548-CVE-2026-23392-fd9d@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026032548-CVE-2026-23392-fd9d@gregkh/T"
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          "date": "2026-06-17T13:24:34+00:00",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "category": "impact",
          "details": "Moderate"
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      "title": "kernel: netfilter: nf_tables: release flowtable after rcu grace period on error"
    },
    {
      "cve": "CVE-2026-43116",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2026-05-06T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467005"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `netfilter: ctnetlink` component of the Linux kernel. This vulnerability occurs due to insufficient locking when accessing the master conntrack object, allowing it to become invalid while still being referenced. A local attacker could potentially exploit this race condition, leading to a system crash and a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: netfilter: ctnetlink: ensure safe access to master conntrack",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "ctnetlink expectation handling could keep a reference to the expectation object while the associated master conntrack object was freed concurrently. This leaves exp master as a stale pointer and can let get, delete, or event reporting paths access master conntrack state after it has gone away. For the CVSS the PR:L is used in the paranoid score because some deployments delegate CAP_NET_ADMIN or conntrack management inside network namespaces or containers to less privileged local users. The issue is not directly network reachable as a remote packet only attack, although traffic and conntrack activity can help create the concurrent state needed for the race. In the paranoid case, the stale master conntrack pointer is treated as a use after free candidate with possible confidentiality and integrity impact.",
          "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-2026-43116"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467005",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467005"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-43116",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-43116"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43116",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43116"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026050626-CVE-2026-43116-08a5@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026050626-CVE-2026-43116-08a5@gregkh/T"
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          "category": "vendor_fix",
          "date": "2026-06-17T13:24:34+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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          "category": "impact",
          "details": "Moderate"
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      "title": "kernel: netfilter: ctnetlink: ensure safe access to master conntrack"
    },
    {
      "cve": "CVE-2026-43158",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "discovery_date": "2026-05-06T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467210"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s XFS filesystem. When adding extended attributes (xattrs), which are metadata associated with files, to leaf blocks, incorrect adjustments to the freemap can occur. This inconsistency allows the entries array and free space to overlap, leading to an assertion failure. A local user can exploit this to cause the filesystem to shut down, resulting in a Denial of Service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A local user with the ability to set extended attributes on an XFS filesystem can trigger inconsistent xattr leaf freemap accounting through crafted xattr insertion patterns. This can cause xattr metadata regions to overlap, leading to filesystem corruption detection and XFS shutdown via a reachable assertion. The issue requires the creation of a specific filesystem metadata layout through repeated setxattr operations.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-43158"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467210",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467210"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-43158",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-43158"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-43158",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43158"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026050631-CVE-2026-43158-cc20@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026050631-CVE-2026-43158-cc20@gregkh/T"
        }
      ],
      "release_date": "2026-05-06T00:00:00+00:00",
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          "date": "2026-06-17T13:24:34+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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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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    {
      "cve": "CVE-2026-46243",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-05-26T15:07:49.955000+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2481486"
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      "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-46243"
        },
        {
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          "category": "external",
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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"
    }
  ]
}