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            "value": "RHSA-2026:44232: Red Hat OpenShift Container Platform 4.22"
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            "value": "RHSA-2026:28749: Red Hat Enterprise Linux BaseOS (v. 8)"
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            "value": "RHSA-2026:26535: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)"
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            "value": "RHSA-2026:25533: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)"
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            "value": "RHSA-2026:22964: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)"
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            "value": "RHSA-2026:28740: Red Hat Enterprise Linux BaseOS EUS (v.9.6)"
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            "value": "RHSA-2026:28741: Red Hat Enterprise Linux BaseOS (v. 9)"
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            "value": "RHSA-2026:25120: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
          },
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            "value": "RHSA-2026:22900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
          }
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        "timeline": [
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            "time": "2026-05-01T00:00:00.000Z",
            "value": "Reported to Red Hat."
          },
          {
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            "time": "2026-05-01T00:00:00.000Z",
            "value": "Made public."
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        ],
        "title": "kernel: ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()",
        "workarounds": [
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            "lang": "en",
            "value": "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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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "version": "0",
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              "version": "5.10.253",
              "versionType": "semver"
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              "version": "5.15.203",
              "versionType": "semver"
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              "version": "6.12.81",
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              "status": "unaffected",
              "version": "6.18.22",
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              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.81",
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                {
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                {
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                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
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              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()\n\nOskar Kjos reported the following problem.\n\nip4ip6_err() calls icmp_send() on a cloned skb whose cb[] was written\nby the IPv6 receive path as struct inet6_skb_parm. icmp_send() passes\nIPCB(skb2) to __ip_options_echo(), which interprets that cb[] region\nas struct inet_skb_parm (IPv4). The layouts differ: inet6_skb_parm.nhoff\nat offset 14 overlaps inet_skb_parm.opt.rr, producing a non-zero rr\nvalue. __ip_options_echo() then reads optlen from attacker-controlled\npacket data at sptr[rr+1] and copies that many bytes into dopt-\u003e__data,\na fixed 40-byte stack buffer (IP_OPTIONS_DATA_FIXED_SIZE).\n\nTo fix this we clear skb2-\u003ecb[], as suggested by Oskar Kjos.\n\nAlso add minimal IPv4 header validation (version == 4, ihl \u003e= 5)."
        }
      ],
      "metrics": [
        {
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            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A remote IPv6 peer can send a crafted ICMPv6 error packet to an IPv6 tunnel endpoint and reach `icmpv6_rcv()` -\u003e `icmpv6_notify()` -\u003e `tunnel46_err()` -\u003e `ip4ip6_err()` without local execution. The vulnerable code processes network packet contents in the kernel network stack.\nAC:L - Triggering is deterministic once an IPv4-over-IPv6 tunnel endpoint exists: the attacker controls the ICMPv6 error, IPv6 extension-header-derived control block state, and quoted inner IPv4 bytes used by `__ip_options_echo()`. There is no race or hard-to-influence condition.\nPR:N - The exploit packet is unauthenticated network input and does not require the attacker to have an account or capabilities on the target. Tunnel configuration requires administration, but exploitation of an already deployed tunnel endpoint does not.\nUI:N - No victim user action is required; receipt and processing of the crafted ICMPv6 packet is enough. The path is normal kernel packet handling.\nS:U - The corruption occurs inside the kernel network stack and impacts the same kernel security authority. This is not a VM escape or cross-scope boundary bypass.\nC:H - The bug is an attacker-controlled kernel stack buffer overflow in `__ip_options_echo()` via a bogus IPv4 option length copied into a fixed 40-byte buffer. Kernel memory corruption of this kind can plausibly be leveraged for high-impact information disclosure.\nI:H - The overflow copies attacker-controlled packet data onto the kernel stack and can plausibly corrupt control data or adjacent state. Under the required higher-severity rule, this supports high integrity impact.\nA:H - Even without full code execution, the kernel stack overflow can trigger an oops, panic, or other fatal corruption. The crafted packet can be sent remotely and repeatedly against a vulnerable tunnel endpoint."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:25:27.160Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ea9f65b27c8404e164848ebff1443310fd187629"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6621f60192fe10c047a4487be42a6f4c150707f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cc6e3b0fe0f0242d1f530a93a4924f48ab85ba5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c4ce9900a108eaf55d0f3b399cb55999647d39"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/590f622669b97eaf7b57a1de7b0a6e68c5d8b2c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a622658f384b03560834cbe8ffcfe69a278f7c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/2edfa31769a4add828a7e604b21cb82aaaa05925"
        }
      ],
      "title": "ip6_tunnel: clear skb2-\u003ecb[] in ip4ip6_err()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43037",
    "datePublished": "2026-05-01T14:15:35.314Z",
    "dateReserved": "2026-05-01T14:12:55.978Z",
    "dateUpdated": "2026-09-01T12:04:49.422Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: fix overlayfs mmap() and mprotect() access checks\n\nThe existing SELinux security model for overlayfs is to allow access if\nthe current task is able to access the top level file (the \"user\" file)\nand the mounter\u0027s credentials are sufficient to access the lower\nlevel file (the \"backing\" file).  Unfortunately, the current code does\nnot properly enforce these access controls for both mmap() and mprotect()\noperations on overlayfs filesystems.\n\nThis patch makes use of the newly created security_mmap_backing_file()\nLSM hook to provide the missing backing file enforcement for mmap()\noperations, and leverages the backing file API and new LSM blob to\nprovide the necessary information to properly enforce the mprotect()\naccess controls."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached only via the local `mmap(2)`/`mprotect(2)` syscalls on a file residing on a stacked filesystem (overlayfs); there is no network-facing path.\nAC:L - A confined process reliably triggers the missing backing-file check on every mmap/mprotect of an overlayfs file; there is no race, timing, or memory-layout condition outside the attacker\u0027s control.\nPR:L - Exploitation requires a local, low-privileged (typically SELinux-confined) process; overlayfs is `FS_USERNS_MOUNT`, so even an unprivileged user can set up the overlay and reach these paths.\nUI:N - The attacking process performs mmap/mprotect itself; no action by any other user is needed.\nS:U - Both the vulnerable component (kernel/SELinux LSM) and the impacted resources (files governed by the same kernel/SELinux authority) lie within one security scope; there is no VM/IOMMU/hypervisor boundary crossing.\nC:H - The missing backing-file check bypasses the mounter-credential `FILE__READ` gate, allowing a confined process to mmap and read the full contents of attacker-chosen backing files that SELinux policy was meant to protect.\nI:H - The bypass also defeats `FILE__WRITE`, `FILE__EXECUTE`, `PROCESS__EXECMEM`, and `FILE__EXECMOD` enforcement, letting a confined process modify shared-mapped backing files and execute code/modified content that policy explicitly forbids \u2014 a direct, serious integrity violation.\nA:N - The defect is a missing permission check with no memory corruption, crash, hang, or resource exhaustion; availability is unaffected."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:22.291Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bc6c380c1159de52a252ed11f19a42c47f60a735"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bacd09f12c27710228562e4d13163e58c5f4a45"
        },
        {
          "url": "https://git.kernel.org/stable/c/d844702198395d3f80222777030f69db6be6b709"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd0e707a927a70cdfd8bc5a512a9719a87f5ed51"
        },
        {
          "url": "https://git.kernel.org/stable/c/82544d36b1729153c8aeb179e84750f0c085d3b1"
        }
      ],
      "title": "selinux: fix overlayfs mmap() and mprotect() access checks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46054",
    "datePublished": "2026-05-27T12:57:12.813Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-09-16T12:04:19.732Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}