CVE-2026-31596 (GCVE-0-2026-31596)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
VLAI
Title
ocfs2: handle invalid dinode in ocfs2_group_extend
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: handle invalid dinode in ocfs2_group_extend [BUG] kernel BUG at fs/ocfs2/resize.c:308! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308 Code: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe Call Trace: ... ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583 x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e ... [CAUSE] ocfs2_group_extend() assumes that the global bitmap inode block returned from ocfs2_inode_lock() has already been validated and BUG_ONs when the signature is not a dinode. That assumption is too strong for crafted filesystems because the JBD2-managed buffer path can bypass structural validation and return an invalid dinode to the resize ioctl. [FIX] Validate the dinode explicitly in ocfs2_group_extend(). If the global bitmap buffer does not contain a valid dinode, report filesystem corruption with ocfs2_error() and fail the resize operation instead of crashing the kernel.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 7eafcf507fbd68f3276c00f6c02ef155ad69f79b (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < fabfa6b81bd386154d7e59f8cd8f760f9e68b48c (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < b328d8e7c437d0f026ba2c13788af6eae77700f1 (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 6575f9fbf084502b7118a628425bf7866666498d (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 911b557dd7817460881fd51a03069b539c674d0e (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < e384a850a3370d89a7a446cdeccd964bfba2a302 (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 10fb72c47aac446f12a4ccd962c7daa60cc890a1 (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 41c6e9bc3a09539deab43957a3211d902a4818f0 (git)
Affected: 10995aa2451afa20b721cc7de856cae1a13dba57 , < 4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "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."
        }
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        "dateUpdated": "2026-06-14T17:42:37.033Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b"
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          "url": "https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f"
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      "title": "ocfs2: handle invalid dinode in ocfs2_group_extend",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31596",
    "datePublished": "2026-04-24T14:42:22.003Z",
    "dateReserved": "2026-03-09T15:48:24.121Z",
    "dateUpdated": "2026-06-14T17:42:37.033Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31596",
      "date": "2026-07-19",
      "epss": "0.00133",
      "percentile": "0.03222"
    },
    "microsoft_vex": {
      "current_release_date": "2026-05-01T14:40:00.000Z",
      "cve": "CVE-2026-31596",
      "id": "msrc_CVE-2026-31596",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ocfs2: handle invalid dinode in ocfs2_group_extend",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31596.json",
      "version": "6"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31596\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:37.340\",\"lastModified\":\"2026-06-17T10:34:03.260\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/resize.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"7eafcf507fbd68f3276c00f6c02ef155ad69f79b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"fabfa6b81bd386154d7e59f8cd8f760f9e68b48c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"b328d8e7c437d0f026ba2c13788af6eae77700f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"6575f9fbf084502b7118a628425bf7866666498d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"911b557dd7817460881fd51a03069b539c674d0e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"e384a850a3370d89a7a446cdeccd964bfba2a302\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"10fb72c47aac446f12a4ccd962c7daa60cc890a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"41c6e9bc3a09539deab43957a3211d902a4818f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"10995aa2451afa20b721cc7de856cae1a13dba57\",\"lessThan\":\"4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/resize.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.29\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.29\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.136\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.1\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.29\",\"versionEndExcluding\":\"6.6.136\",\"matchCriteriaId\":\"61A18ECC-DBBE-4804-B80E-C799CC05CD13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.14\",\"matchCriteriaId\":\"D6A8A074-BBF4-4803-ABED-519A839435BB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.0\",\"versionEndExcluding\":\"7.0.1\",\"matchCriteriaId\":\"9B5888AB-7403-4335-89E4-21CC0B48366A\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:58:43+00:00",
      "cve": "CVE-2026-31596",
      "id": "CVE-2026-31596",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: handle invalid dinode in ocfs2_group_extend",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31596.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.