CVE-2026-45858 (GCVE-0-2026-45858)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-05-30 10:41
VLAI
Title
ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1 When allocating initialized blocks from a large unwritten extent, or when splitting an unwritten extent during end I/O and converting it to initialized, there is currently a potential issue of stale data if the extent needs to be split in the middle. 0 A B N [UUUUUUUUUUUU] U: unwritten extent [--DDDDDDDD--] D: valid data |<- ->| ----> this range needs to be initialized ext4_split_extent() first try to split this extent at B with EXT4_EXT_DATA_ENTIRE_VALID1 and EXT4_EXT_MAY_ZEROOUT flag set, but ext4_split_extent_at() failed to split this extent due to temporary lack of space. It zeroout B to N and mark the entire extent from 0 to N as written. 0 A B N [WWWWWWWWWWWW] W: written extent [SSDDDDDDDDZZ] Z: zeroed, S: stale data ext4_split_extent() then try to split this extent at A with EXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and left a stale written extent from 0 to A. 0 A B N [WW|WWWWWWWWWW] [SS|DDDDDDDDZZ] Fix this by pass EXT4_EXT_DATA_PARTIAL_VALID1 to ext4_split_extent_at() when splitting at B, don't convert the entire extent to written and left it as unwritten after zeroing out B to N. The remaining work is just like the standard two-part split. ext4_split_extent() will pass the EXT4_EXT_DATA_VALID2 flag when it calls ext4_split_extent_at() for the second time, allowing it to properly handle the split. If the split is successful, it will keep extent from 0 to A as unwritten.
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: dee1f973ca341c266229faa5a1a5bb268bed3531 , < 58ddae5d77b1db3a27b891c75a8fa120239ac092 (git)
Affected: dee1f973ca341c266229faa5a1a5bb268bed3531 , < d17857b4fb9ba5745b59be0ef38fd532991fccbf (git)
Affected: dee1f973ca341c266229faa5a1a5bb268bed3531 , < d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88 (git)
Affected: dee1f973ca341c266229faa5a1a5bb268bed3531 , < 7015fcf473796e1d2d876f241bd9e0c36f3d4eef (git)
Affected: dee1f973ca341c266229faa5a1a5bb268bed3531 , < 1bf6974822d1dba86cf11b5f05498581cf3488a2 (git)
Affected: 814a7833df19e1de7447f870ae890adb12561627 (git)
Affected: 4319fd00002630a761fa5559a086f11ed7623006 (git)
Affected: e28b27be06c5e6a5236c0c0b370ca0768ab086bb (git)
Affected: 3.2.33 , < 3.3 (semver)
Affected: 3.4.16 , < 3.5 (semver)
Affected: 3.6.4 , < 3.7 (semver)
Create a notification for this product.
Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: don\u0027t zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1\n\nWhen allocating initialized blocks from a large unwritten extent, or\nwhen splitting an unwritten extent during end I/O and converting it to\ninitialized, there is currently a potential issue of stale data if the\nextent needs to be split in the middle.\n\n       0  A      B  N\n       [UUUUUUUUUUUU]    U: unwritten extent\n       [--DDDDDDDD--]    D: valid data\n          |\u003c-  -\u003e| ----\u003e this range needs to be initialized\n\next4_split_extent() first try to split this extent at B with\nEXT4_EXT_DATA_ENTIRE_VALID1 and EXT4_EXT_MAY_ZEROOUT flag set, but\next4_split_extent_at() failed to split this extent due to temporary lack\nof space. It zeroout B to N and mark the entire extent from 0 to N\nas written.\n\n       0  A      B  N\n       [WWWWWWWWWWWW]    W: written extent\n       [SSDDDDDDDDZZ]    Z: zeroed, S: stale data\n\next4_split_extent() then try to split this extent at A with\nEXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and left\na stale written extent from 0 to A.\n\n       0  A      B   N\n       [WW|WWWWWWWWWW]\n       [SS|DDDDDDDDZZ]\n\nFix this by pass EXT4_EXT_DATA_PARTIAL_VALID1 to ext4_split_extent_at()\nwhen splitting at B, don\u0027t convert the entire extent to written and left\nit as unwritten after zeroing out B to N. The remaining work is just\nlike the standard two-part split. ext4_split_extent() will pass the\nEXT4_EXT_DATA_VALID2 flag when it calls ext4_split_extent_at() for the\nsecond time, allowing it to properly handle the split. If the split is\nsuccessful, it will keep extent from 0 to A as unwritten."
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        "dateUpdated": "2026-05-30T10:41:40.719Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-45858",
    "datePublished": "2026-05-27T12:15:37.738Z",
    "dateReserved": "2026-05-13T15:03:33.079Z",
    "dateUpdated": "2026-05-30T10:41:40.719Z",
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It zeroout B to N and mark the entire extent from 0 to N\\nas written.\\n\\n       0  A      B  N\\n       [WWWWWWWWWWWW]    W: written extent\\n       [SSDDDDDDDDZZ]    Z: zeroed, S: stale data\\n\\next4_split_extent() then try to split this extent at A with\\nEXT4_EXT_DATA_VALID2 flag set. This time, it split successfully and left\\na stale written extent from 0 to A.\\n\\n       0  A      B   N\\n       [WW|WWWWWWWWWW]\\n       [SS|DDDDDDDDZZ]\\n\\nFix this by pass EXT4_EXT_DATA_PARTIAL_VALID1 to ext4_split_extent_at()\\nwhen splitting at B, don\u0027t convert the entire extent to written and left\\nit as unwritten after zeroing out B to N. The remaining work is just\\nlike the standard two-part split. ext4_split_extent() will pass the\\nEXT4_EXT_DATA_VALID2 flag when it calls ext4_split_extent_at() for the\\nsecond time, allowing it to properly handle the split. If the split is\\nsuccessful, it will keep extent from 0 to A as 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    "redhat_vex": {
      "current_release_date": "2026-06-28T07:39:44+00:00",
      "cve": "CVE-2026-45858",
      "id": "CVE-2026-45858",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: don\u0027t zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45858.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.