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EUVD-2026-345140

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:00

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:00:04.332233+00:00",
  "id": "EUVD-2026-345140"
}

CVE-2023-53100 (GCVE-0-2023-53100)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-08-05 09:12

Title

ext4: fix WARNING in ext4_update_inline_data

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix WARNING in ext4_update_inline_data Syzbot found the following issue: EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none. fscrypt: AES-256-CTS-CBC using implementation "cts-cbc-aes-aesni" fscrypt: AES-256-XTS using implementation "xts-aes-aesni" ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5071 at mm/page_alloc.c:5525 __alloc_pages+0x30a/0x560 mm/page_alloc.c:5525 Modules linked in: CPU: 1 PID: 5071 Comm: syz-executor263 Not tainted 6.2.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:__alloc_pages+0x30a/0x560 mm/page_alloc.c:5525 RSP: 0018:ffffc90003c2f1c0 EFLAGS: 00010246 RAX: ffffc90003c2f220 RBX: 0000000000000014 RCX: 0000000000000000 RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003c2f248 RBP: ffffc90003c2f2d8 R08: dffffc0000000000 R09: ffffc90003c2f220 R10: fffff52000785e49 R11: 1ffff92000785e44 R12: 0000000000040d40 R13: 1ffff92000785e40 R14: dffffc0000000000 R15: 1ffff92000785e3c FS: 0000555556c0d300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95d5e04138 CR3: 00000000793aa000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_pages_node include/linux/gfp.h:260 [inline] __kmalloc_large_node+0x95/0x1e0 mm/slab_common.c:1113 __do_kmalloc_node mm/slab_common.c:956 [inline] __kmalloc+0xfe/0x190 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:720 [inline] ext4_update_inline_data+0x236/0x6b0 fs/ext4/inline.c:346 ext4_update_inline_dir fs/ext4/inline.c:1115 [inline] ext4_try_add_inline_entry+0x328/0x990 fs/ext4/inline.c:1307 ext4_add_entry+0x5a4/0xeb0 fs/ext4/namei.c:2385 ext4_add_nondir+0x96/0x260 fs/ext4/namei.c:2772 ext4_create+0x36c/0x560 fs/ext4/namei.c:2817 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12ac/0x2dd0 fs/namei.c:3711 do_filp_open+0x264/0x4f0 fs/namei.c:3741 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Above issue happens as follows: ext4_iget ext4_find_inline_data_nolock ->i_inline_off=164 i_inline_size=60 ext4_try_add_inline_entry __ext4_mark_inode_dirty ext4_expand_extra_isize_ea ->i_extra_isize=32 s_want_extra_isize=44 ext4_xattr_shift_entries ->after shift i_inline_off is incorrect, actually is change to 176 ext4_try_add_inline_entry ext4_update_inline_dir get_max_inline_xattr_value_size if (EXT4_I(inode)->i_inline_off) entry = (struct ext4_xattr_entry *)((void *)raw_inode + EXT4_I(inode)->i_inline_off); free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); ->As entry is incorrect, then 'free' may be negative ext4_update_inline_data value = kzalloc(len, GFP_NOFS); -> len is unsigned int, maybe very large, then trigger warning when 'kzalloc()' To resolve the above issue we need to update 'i_inline_off' after 'ext4_xattr_shift_entries()'. We do not need to set EXT4_STATE_MAY_INLINE_DATA flag here, since ext4_mark_inode_dirty() already sets this flag if needed. Setting EXT4_STATE_MAY_INLINE_DATA when it is needed may trigger a BUG_ON in ext4_writepages().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c5aa102b433b1890e…
https://git.kernel.org/stable/c/39c5df2ca544368b4…
https://git.kernel.org/stable/c/74d775083e9f3d9da…
https://git.kernel.org/stable/c/a9bd94f67b27739bb…
https://git.kernel.org/stable/c/ca500cf2eceb5a8e9…
https://git.kernel.org/stable/c/35161cec76772f745…
https://git.kernel.org/stable/c/92eee6a82a9a6f9f8…
https://git.kernel.org/stable/c/2b96b4a5d9443ca4c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < c5aa102b433b1890e1ccaa40c06826c77dda1665 (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 39c5df2ca544368b44b59d0f6d80131e90763371 (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 74d775083e9f3d9dadf9e3b5f3e0028d1ad0bd5c (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < a9bd94f67b27739bbe8583c52256502bd4cc7e83 (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < ca500cf2eceb5a8e93bf71ab97b5f7a18ecabce2 (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 35161cec76772f74526f5886ad4082ec48511d5c (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 92eee6a82a9a6f9f83559e17a2b6b935e1a5cd25 (git) Affected: 67cf5b09a46f72e048501b84996f2f77bc42e947 , < 2b96b4a5d9443ca4cad58b0040be455803c05a42 (git)
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 4.14.310 , ≤ 4.14.* (semver) Unaffected: 4.19.278 , ≤ 4.19.* (semver) Unaffected: 5.4.237 , ≤ 5.4.* (semver) Unaffected: 5.10.175 , ≤ 5.10.* (semver) Unaffected: 5.15.103 , ≤ 5.15.* (semver) Unaffected: 6.1.20 , ≤ 6.1.* (semver) Unaffected: 6.2.7 , ≤ 6.2.* (semver) Unaffected: 6.3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/xattr.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
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              "versionType": "git"
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "3.8"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.310",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.278",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.237",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.310",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.278",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.237",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.8",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "5.15.103",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.20",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.7",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "3.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix WARNING in ext4_update_inline_data\n\nSyzbot found the following issue:\nEXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none.\nfscrypt: AES-256-CTS-CBC using implementation \"cts-cbc-aes-aesni\"\nfscrypt: AES-256-XTS using implementation \"xts-aes-aesni\"\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 5071 at mm/page_alloc.c:5525 __alloc_pages+0x30a/0x560 mm/page_alloc.c:5525\nModules linked in:\nCPU: 1 PID: 5071 Comm: syz-executor263 Not tainted 6.2.0-rc1-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nRIP: 0010:__alloc_pages+0x30a/0x560 mm/page_alloc.c:5525\nRSP: 0018:ffffc90003c2f1c0 EFLAGS: 00010246\nRAX: ffffc90003c2f220 RBX: 0000000000000014 RCX: 0000000000000000\nRDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc90003c2f248\nRBP: ffffc90003c2f2d8 R08: dffffc0000000000 R09: ffffc90003c2f220\nR10: fffff52000785e49 R11: 1ffff92000785e44 R12: 0000000000040d40\nR13: 1ffff92000785e40 R14: dffffc0000000000 R15: 1ffff92000785e3c\nFS:  0000555556c0d300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f95d5e04138 CR3: 00000000793aa000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n __alloc_pages_node include/linux/gfp.h:237 [inline]\n alloc_pages_node include/linux/gfp.h:260 [inline]\n __kmalloc_large_node+0x95/0x1e0 mm/slab_common.c:1113\n __do_kmalloc_node mm/slab_common.c:956 [inline]\n __kmalloc+0xfe/0x190 mm/slab_common.c:981\n kmalloc include/linux/slab.h:584 [inline]\n kzalloc include/linux/slab.h:720 [inline]\n ext4_update_inline_data+0x236/0x6b0 fs/ext4/inline.c:346\n ext4_update_inline_dir fs/ext4/inline.c:1115 [inline]\n ext4_try_add_inline_entry+0x328/0x990 fs/ext4/inline.c:1307\n ext4_add_entry+0x5a4/0xeb0 fs/ext4/namei.c:2385\n ext4_add_nondir+0x96/0x260 fs/ext4/namei.c:2772\n ext4_create+0x36c/0x560 fs/ext4/namei.c:2817\n lookup_open fs/namei.c:3413 [inline]\n open_last_lookups fs/namei.c:3481 [inline]\n path_openat+0x12ac/0x2dd0 fs/namei.c:3711\n do_filp_open+0x264/0x4f0 fs/namei.c:3741\n do_sys_openat2+0x124/0x4e0 fs/open.c:1310\n do_sys_open fs/open.c:1326 [inline]\n __do_sys_openat fs/open.c:1342 [inline]\n __se_sys_openat fs/open.c:1337 [inline]\n __x64_sys_openat+0x243/0x290 fs/open.c:1337\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nAbove issue happens as follows:\next4_iget\n   ext4_find_inline_data_nolock -\u003ei_inline_off=164 i_inline_size=60\next4_try_add_inline_entry\n   __ext4_mark_inode_dirty\n      ext4_expand_extra_isize_ea -\u003ei_extra_isize=32 s_want_extra_isize=44\n         ext4_xattr_shift_entries\n\t -\u003eafter shift i_inline_off is incorrect, actually is change to 176\next4_try_add_inline_entry\n  ext4_update_inline_dir\n    get_max_inline_xattr_value_size\n      if (EXT4_I(inode)-\u003ei_inline_off)\n\tentry = (struct ext4_xattr_entry *)((void *)raw_inode +\n\t\t\tEXT4_I(inode)-\u003ei_inline_off);\n        free += EXT4_XATTR_SIZE(le32_to_cpu(entry-\u003ee_value_size));\n\t-\u003eAs entry is incorrect, then \u0027free\u0027 may be negative\n   ext4_update_inline_data\n      value = kzalloc(len, GFP_NOFS);\n      -\u003e len is unsigned int, maybe very large, then trigger warning when\n         \u0027kzalloc()\u0027\n\nTo resolve the above issue we need to update \u0027i_inline_off\u0027 after\n\u0027ext4_xattr_shift_entries()\u0027.  We do not need to set\nEXT4_STATE_MAY_INLINE_DATA flag here, since ext4_mark_inode_dirty()\nalready sets this flag if needed.  Setting EXT4_STATE_MAY_INLINE_DATA\nwhen it is needed may trigger a BUG_ON in ext4_writepages()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached via local VFS syscalls (openat/create \u2192 ext4_try_add_inline_entry / readdir \u2192 inline data helpers) on a mounted ext4 filesystem, not via any network or adjacent-link protocol path.\nAC:L - An attacker who can create files in an inline_data directory whose inode still needs extra-isize expansion (common after kernel upgrades, or forced via debug_want_extra_isize) can reliably trigger the stale i_inline_off path; no attacker-uncontrollable race is required.\nPR:L - On an already-mounted ext4 volume (e.g. Android userdata or /home) the trigger is ordinary unprivileged file creation/readdir with write access; unlike SWAP_BOOT-style paths, no init-namespace CAP_SYS_ADMIN is required on this entry point.\nUI:N - The attacker performs the create/readdir operations themselves on a filesystem that is already mounted in the worst reasonable deployment; no separate victim action is required.\nS:U - Impact remains within the host kernel\u0027s ext4/VFS authority (local memory corruption / DoS); there is no VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Stale i_inline_off causes ext4_read_inline_data to treat attacker-influenced inode bytes as e_value_offs and memcpy from IFIRST+offs with no bounds check, yielding an out-of-bounds kernel read into directory buffers.\nI:H - The same stale offset is consumed by ext4_get_inline_xattr_pos \u2192 ext4_add_dirent_to_inline, which writes directory entries to an unchecked IFIRST+e_value_offs destination\u2014an out-of-bounds kernel write exploitable for corruption/control-flow hijack.\nA:H - The demonstrated path computes a huge unsigned kzalloc length and hits WARN_ON_ONCE in __alloc_pages (panic_on_warn / oops class), and the OOB inline-data paths can likewise crash the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:46.679Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c5aa102b433b1890e1ccaa40c06826c77dda1665"
        },
        {
          "url": "https://git.kernel.org/stable/c/39c5df2ca544368b44b59d0f6d80131e90763371"
        },
        {
          "url": "https://git.kernel.org/stable/c/74d775083e9f3d9dadf9e3b5f3e0028d1ad0bd5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9bd94f67b27739bbe8583c52256502bd4cc7e83"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca500cf2eceb5a8e93bf71ab97b5f7a18ecabce2"
        },
        {
          "url": "https://git.kernel.org/stable/c/35161cec76772f74526f5886ad4082ec48511d5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/92eee6a82a9a6f9f83559e17a2b6b935e1a5cd25"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b96b4a5d9443ca4cad58b0040be455803c05a42"
        }
      ],
      "title": "ext4: fix WARNING in ext4_update_inline_data",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53100",
    "datePublished": "2025-05-02T15:55:43.113Z",
    "dateReserved": "2025-05-02T15:51:43.553Z",
    "dateUpdated": "2026-08-05T09:12:46.679Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-345140

CVE-2023-53100 (GCVE-0-2023-53100)

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