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        "category": "legal_disclaimer",
        "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 Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2026-04-24T15:16:00Z",
          "number": "1",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: handle invalid dinode in ocfs2_group_extend\n\n[BUG]\nkernel BUG at fs/ocfs2/resize.c:308!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308\nCode: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe\nCall Trace:\n ...\n ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583\n x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n\n[CAUSE]\nocfs2_group_extend() assumes that the global bitmap inode block\nreturned from ocfs2_inode_lock() has already been validated and\nBUG_ONs when the signature is not a dinode. That assumption is too\nstrong for crafted filesystems because the JBD2-managed buffer path\ncan bypass structural validation and return an invalid dinode to the\nresize ioctl.\n\n[FIX]\nValidate the dinode explicitly in ocfs2_group_extend(). If the global\nbitmap buffer does not contain a valid dinode, report filesystem\ncorruption with ocfs2_error() and fail the resize operation instead of\ncrashing the kernel.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's 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://cve.tuxcare.com/els/cve/CVE-2026-31596"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1",
          "url": "https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1"
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          "summary": "https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0",
          "url": "https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0"
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          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f",
          "url": "https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d",
          "url": "https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b",
          "url": "https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e",
          "url": "https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1",
          "url": "https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302",
          "url": "https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c",
          "url": "https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c"
        }
      ],
      "release_date": "2026-04-24T15:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T15:52:29.047601Z",
          "details": "This issue is only reachable on hosts that actively use the optional OCFS2 filesystem and, even then, requires a local user with the CAP_SYS_RESOURCE capability to invoke the OCFS2_IOC_GROUP_EXTEND resize ioctl against a mounted, writable OCFS2 volume (typically with a crafted on‑disk structure). Its sole effect is a kernel crash/DoS (availability impact) with no confidentiality or integrity impact and no privilege escalation. Systems that do not mount OCFS2 volumes or do not grant CAP_SYS_RESOURCE to non‑admin processes are not exposed to this path, so it can be safely deprioritized in managed enterprise environments.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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}