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EUVD-2026-345358

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:01

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": "2026-10-02T08:01:24.610863+00:00",
  "id": "EUVD-2026-345358"
}

CVE-2023-54062 (GCVE-0-2023-54062)

Vulnerability from cvelistv5 – Published: 2025-12-24 12:23 – Updated: 2026-08-05 09:16

Title

ext4: fix invalid free tracking in ext4_xattr_move_to_block()

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.

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

9 references

URL	Tags
https://git.kernel.org/stable/c/76887be2a96193cd1…
https://git.kernel.org/stable/c/f30f3391d089dc91a…
https://git.kernel.org/stable/c/ba04d6af5ac440a6d…
https://git.kernel.org/stable/c/1a8822343e67432b6…
https://git.kernel.org/stable/c/8beaa3cb293a8f7ba…
https://git.kernel.org/stable/c/c5fa4eedddd1c8342…
https://git.kernel.org/stable/c/a18670395e5f28acd…
https://git.kernel.org/stable/c/b2fab1807d26acd1c…
https://git.kernel.org/stable/c/b87c7cdf2bed4928b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c7851208abffe5ae4deb01cf48763911dc14fc67 , < 76887be2a96193cd11be818551b8934ecdb3123f (git) Affected: f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7 , < f30f3391d089dc91aef91d08f4b04a6c0df2b067 (git) Affected: 3b28c799a1334adb5a19f42f03abe0d8cbb05938 , < ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a (git) Affected: d738789ae9ec47d3458a008788f3cdc862ebf0cb , < 1a8822343e67432b658145d2760a524c884da9d4 (git) Affected: a6744e14ce7045ab1a728bde9595f62fbd39f1d2 , < 8beaa3cb293a8f7bacf711cf52201d59859dbc40 (git) Affected: 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf , < c5fa4eedddd1c8342ce533cb401c0e693e55b4e3 (git) Affected: d2efaf8c870c7067b8d1779773134f3481cd8f68 , < a18670395e5f28acddeca037c5e4bd2ea961b70a (git) Affected: 1e9d62d252812575ded7c620d8fc67c32ff06c16 , < b2fab1807d26acd1c6115b95b5eddd697d84751b (git) Affected: 1e9d62d252812575ded7c620d8fc67c32ff06c16 , < b87c7cdf2bed4928b899e1ce91ef0d147017ba45 (git) Affected: 4.14.308 , < 4.14.315 (semver) Affected: 4.19.276 , < 4.19.283 (semver) Affected: 5.4.235 , < 5.4.243 (semver) Affected: 5.10.173 , < 5.10.180 (semver) Affected: 5.15.99 , < 5.15.112 (semver) Affected: 6.1.16 , < 6.1.29 (semver) Affected: 6.2.3 , < 6.2.16 (semver)
Linux	Linux	Affected: 6.3 Unaffected: 0 , < 6.3 (semver) Unaffected: 4.14.315 , ≤ 4.14.* (semver) Unaffected: 4.19.283 , ≤ 4.19.* (semver) Unaffected: 5.4.243 , ≤ 5.4.* (semver) Unaffected: 5.10.180 , ≤ 5.10.* (semver) Unaffected: 5.15.112 , ≤ 5.15.* (semver) Unaffected: 6.1.29 , ≤ 6.1.* (semver) Unaffected: 6.2.16 , ≤ 6.2.* (semver) Unaffected: 6.3.3 , ≤ 6.3.* (semver) Unaffected: 6.4 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "c7851208abffe5ae4deb01cf48763911dc14fc67",
              "versionType": "git"
            },
            {
              "lessThan": "f30f3391d089dc91aef91d08f4b04a6c0df2b067",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a",
              "status": "affected",
              "version": "3b28c799a1334adb5a19f42f03abe0d8cbb05938",
              "versionType": "git"
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              "lessThan": "1a8822343e67432b658145d2760a524c884da9d4",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "8beaa3cb293a8f7bacf711cf52201d59859dbc40",
              "status": "affected",
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              "versionType": "git"
            },
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              "versionType": "git"
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              "versionType": "git"
            },
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "semver"
            },
            {
              "lessThan": "4.19.283",
              "status": "affected",
              "version": "4.19.276",
              "versionType": "semver"
            },
            {
              "lessThan": "5.4.243",
              "status": "affected",
              "version": "5.4.235",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.180",
              "status": "affected",
              "version": "5.10.173",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.112",
              "status": "affected",
              "version": "5.15.99",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.29",
              "status": "affected",
              "version": "6.1.16",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2.16",
              "status": "affected",
              "version": "6.2.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.315",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.283",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.243",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.180",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.29",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.315",
                  "versionStartIncluding": "4.14.308",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.283",
                  "versionStartIncluding": "4.19.276",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.4.235",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.180",
                  "versionStartIncluding": "5.10.173",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.112",
                  "versionStartIncluding": "5.15.99",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
                {
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                },
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix invalid free tracking in ext4_xattr_move_to_block()\n\nIn ext4_xattr_move_to_block(), the value of the extended attribute\nwhich we need to move to an external block may be allocated by\nkvmalloc() if the value is stored in an external inode.  So at the end\nof the function the code tried to check if this was the case by\ntesting entry-\u003ee_value_inum.\n\nHowever, at this point, the pointer to the xattr entry is no longer\nvalid, because it was removed from the original location where it had\nbeen stored.  So we could end up calling kvfree() on a pointer which\nwas not allocated by kvmalloc(); or we could also potentially leak\nmemory by not freeing the buffer when it should be freed.  Fix this by\nstoring whether it should be freed in a separate variable."
        }
      ],
      "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 through local filesystem operations \u2014 `setxattr()` plus any inode-dirtying syscall on a mounted ext4 volume, or by mounting a crafted ext4 image. No network or remote peer is involved.\nAC:L - No race and no memory-layout luck is needed; the invalid free happens deterministically whenever the moved inline-value xattr is followed by an EA-inode-backed entry, and the attacker controls both the entry ordering (name-sorted) and the sizes that drive `ext4_xattr_make_inode_space()`\u0027s selection, or controls everything outright via a crafted image.\nPR:L - An ordinary unprivileged user only needs a file they own to set `user.*` xattrs on and then dirty the inode; no capability, and `ext4_expand_extra_isize_ea()` runs from the ordinary `ext4_mark_inode_dirty()` path.\nUI:N - In the local-user scenario the attacker performs every step themselves \u2014 setxattr, then touch/write to dirty the inode \u2014 with no victim action required.\nS:U - The corruption stays within the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - `__free_pages()` on a still-referenced page-cache page underflows its refcount, so the page is recycled while ext4 keeps reading the inode table through the stale `buffer_head`, disclosing whatever kernel data now occupies that page; the `WARN` also leaks a kernel pointer.\nI:H - After the premature page free, ext4 continues writing inode and xattr bytes into the reallocated page through the stale `buffer_head`, giving a page-granularity kernel write primitive suitable for privilege escalation; slab/memcg accounting is corrupted as well.\nA:H - On 4.19/5.10-era kernels `kfree()` on the non-slab pointer hits `BUG_ON(!PageCompound(page))` for an immediate panic; on 6.x it produces a `WARN_ON_ONCE` (panic under `panic_on_warn`) plus a page refcount underflow that leads to a later oops, and the inverse case leaks memory on every attempt."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:50.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76887be2a96193cd11be818551b8934ecdb3123f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f30f3391d089dc91aef91d08f4b04a6c0df2b067"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a8822343e67432b658145d2760a524c884da9d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/8beaa3cb293a8f7bacf711cf52201d59859dbc40"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5fa4eedddd1c8342ce533cb401c0e693e55b4e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a18670395e5f28acddeca037c5e4bd2ea961b70a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2fab1807d26acd1c6115b95b5eddd697d84751b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b87c7cdf2bed4928b899e1ce91ef0d147017ba45"
        }
      ],
      "title": "ext4: fix invalid free tracking in ext4_xattr_move_to_block()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54062",
    "datePublished": "2025-12-24T12:23:08.649Z",
    "dateReserved": "2025-12-24T12:21:05.092Z",
    "dateUpdated": "2026-08-05T09:16:50.491Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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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EUVD-2026-345358

CVE-2023-54062 (GCVE-0-2023-54062)

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