FKIE_CVE-2026-31450

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-05-06 19:53
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: publish jinode after initialization ext4_inode_attach_jinode() publishes ei->jinode to concurrent users. It used to set ei->jinode before jbd2_journal_init_jbd_inode(), allowing a reader to observe a non-NULL jinode with i_vfs_inode still unset. The fast commit flush path can then pass this jinode to jbd2_wait_inode_data(), which dereferences i_vfs_inode->i_mapping and may crash. Below is the crash I observe: ``` BUG: unable to handle page fault for address: 000000010beb47f4 PGD 110e51067 P4D 110e51067 PUD 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 4850 Comm: fc_fsync_bench_ Not tainted 6.18.0-00764-g795a690c06a5 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.17.0-2-2 04/01/2014 RIP: 0010:xas_find_marked+0x3d/0x2e0 Code: e0 03 48 83 f8 02 0f 84 f0 01 00 00 48 8b 47 08 48 89 c3 48 39 c6 0f 82 fd 01 00 00 48 85 c9 74 3d 48 83 f9 03 77 63 4c 8b 0f <49> 8b 71 08 48 c7 47 18 00 00 00 00 48 89 f1 83 e1 03 48 83 f9 02 RSP: 0018:ffffbbee806e7bf0 EFLAGS: 00010246 RAX: 000000000010beb4 RBX: 000000000010beb4 RCX: 0000000000000003 RDX: 0000000000000001 RSI: 0000002000300000 RDI: ffffbbee806e7c10 RBP: 0000000000000001 R08: 0000002000300000 R09: 000000010beb47ec R10: ffff9ea494590090 R11: 0000000000000000 R12: 0000002000300000 R13: ffffbbee806e7c90 R14: ffff9ea494513788 R15: ffffbbee806e7c88 FS: 00007fc2f9e3e6c0(0000) GS:ffff9ea6b1444000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010beb47f4 CR3: 0000000119ac5000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> filemap_get_folios_tag+0x87/0x2a0 __filemap_fdatawait_range+0x5f/0xd0 ? srso_alias_return_thunk+0x5/0xfbef5 ? __schedule+0x3e7/0x10c0 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? preempt_count_sub+0x5f/0x80 ? srso_alias_return_thunk+0x5/0xfbef5 ? cap_safe_nice+0x37/0x70 ? srso_alias_return_thunk+0x5/0xfbef5 ? preempt_count_sub+0x5f/0x80 ? srso_alias_return_thunk+0x5/0xfbef5 filemap_fdatawait_range_keep_errors+0x12/0x40 ext4_fc_commit+0x697/0x8b0 ? ext4_file_write_iter+0x64b/0x950 ? srso_alias_return_thunk+0x5/0xfbef5 ? preempt_count_sub+0x5f/0x80 ? srso_alias_return_thunk+0x5/0xfbef5 ? vfs_write+0x356/0x480 ? srso_alias_return_thunk+0x5/0xfbef5 ? preempt_count_sub+0x5f/0x80 ext4_sync_file+0xf7/0x370 do_fsync+0x3b/0x80 ? syscall_trace_enter+0x108/0x1d0 __x64_sys_fdatasync+0x16/0x20 do_syscall_64+0x62/0x2c0 entry_SYSCALL_64_after_hwframe+0x76/0x7e ... ``` Fix this by initializing the jbd2_inode first. Use smp_wmb() and WRITE_ONCE() to publish ei->jinode after initialization. Readers use READ_ONCE() to fetch the pointer.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1aec30021edd410b986c156f195f3d23959a9d11Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d2b648960147d078b000b9a7494017082024366Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33f486987af21531a7b18973d11795ede3da9dddPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4855a59e21789c79f003a9b5f4135c95a7495c6bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a070d5a872ffe0e0fe5c46eda6386140ded39adbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be54c0055407a73b60349c093c8ce621cb8fa232Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4325e84727e539c8597bd5b8491349f57f7fb17Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e76bcb727e4874a2f9d0297f8e3f8eced89b0764Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 3.11
linux linux_kernel 3.11
linux linux_kernel 3.11
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: publish jinode after initialization\n\next4_inode_attach_jinode() publishes ei-\u003ejinode to concurrent users.\nIt used to set ei-\u003ejinode before jbd2_journal_init_jbd_inode(),\nallowing a reader to observe a non-NULL jinode with i_vfs_inode\nstill unset.\n\nThe fast commit flush path can then pass this jinode to\njbd2_wait_inode_data(), which dereferences i_vfs_inode-\u003ei_mapping and\nmay crash.\n\nBelow is the crash I observe:\n```\nBUG: unable to handle page fault for address: 000000010beb47f4\nPGD 110e51067 P4D 110e51067 PUD 0\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 1 UID: 0 PID: 4850 Comm: fc_fsync_bench_ Not tainted 6.18.0-00764-g795a690c06a5 #1 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.17.0-2-2 04/01/2014\nRIP: 0010:xas_find_marked+0x3d/0x2e0\nCode: e0 03 48 83 f8 02 0f 84 f0 01 00 00 48 8b 47 08 48 89 c3 48 39 c6 0f 82 fd 01 00 00 48 85 c9 74 3d 48 83 f9 03 77 63 4c 8b 0f \u003c49\u003e 8b 71 08 48 c7 47 18 00 00 00 00 48 89 f1 83 e1 03 48 83 f9 02\nRSP: 0018:ffffbbee806e7bf0 EFLAGS: 00010246\nRAX: 000000000010beb4 RBX: 000000000010beb4 RCX: 0000000000000003\nRDX: 0000000000000001 RSI: 0000002000300000 RDI: ffffbbee806e7c10\nRBP: 0000000000000001 R08: 0000002000300000 R09: 000000010beb47ec\nR10: ffff9ea494590090 R11: 0000000000000000 R12: 0000002000300000\nR13: ffffbbee806e7c90 R14: ffff9ea494513788 R15: ffffbbee806e7c88\nFS: 00007fc2f9e3e6c0(0000) GS:ffff9ea6b1444000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000010beb47f4 CR3: 0000000119ac5000 CR4: 0000000000750ef0\nPKRU: 55555554\nCall Trace:\n\u003cTASK\u003e\nfilemap_get_folios_tag+0x87/0x2a0\n__filemap_fdatawait_range+0x5f/0xd0\n? srso_alias_return_thunk+0x5/0xfbef5\n? __schedule+0x3e7/0x10c0\n? srso_alias_return_thunk+0x5/0xfbef5\n? srso_alias_return_thunk+0x5/0xfbef5\n? srso_alias_return_thunk+0x5/0xfbef5\n? preempt_count_sub+0x5f/0x80\n? srso_alias_return_thunk+0x5/0xfbef5\n? cap_safe_nice+0x37/0x70\n? srso_alias_return_thunk+0x5/0xfbef5\n? preempt_count_sub+0x5f/0x80\n? srso_alias_return_thunk+0x5/0xfbef5\nfilemap_fdatawait_range_keep_errors+0x12/0x40\next4_fc_commit+0x697/0x8b0\n? ext4_file_write_iter+0x64b/0x950\n? srso_alias_return_thunk+0x5/0xfbef5\n? preempt_count_sub+0x5f/0x80\n? srso_alias_return_thunk+0x5/0xfbef5\n? vfs_write+0x356/0x480\n? srso_alias_return_thunk+0x5/0xfbef5\n? preempt_count_sub+0x5f/0x80\next4_sync_file+0xf7/0x370\ndo_fsync+0x3b/0x80\n? syscall_trace_enter+0x108/0x1d0\n__x64_sys_fdatasync+0x16/0x20\ndo_syscall_64+0x62/0x2c0\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\n...\n```\n\nFix this by initializing the jbd2_inode first.\nUse smp_wmb() and WRITE_ONCE() to publish ei-\u003ejinode after\ninitialization. Readers use READ_ONCE() to fetch the pointer."
    }
  ],
  "id": "CVE-2026-31450",
  "lastModified": "2026-05-06T19:53:42.350",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-22T14:16:39.083",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Sightings

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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.
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