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

Vulnerability from cvelistv5 – Published: 2025-12-24 12:23 – Updated: 2026-01-05 10:33
VLAI?
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 However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored.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 ?
No CVSS data available.
Assigner
References
Impacted 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)
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    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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          "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."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/76887be2a96193cd11be818551b8934ecdb3123f"
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        {
          "url": "https://git.kernel.org/stable/c/b87c7cdf2bed4928b899e1ce91ef0d147017ba45"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54062",
    "datePublished": "2025-12-24T12:23:08.649Z",
    "dateReserved": "2025-12-24T12:21:05.092Z",
    "dateUpdated": "2026-01-05T10:33:36.754Z",
    "state": "PUBLISHED"
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  }
}


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  • 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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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