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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 CPE status
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)
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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)
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    "dateReserved": "2026-05-13T15:03:33.079Z",
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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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:14:47Z",
      "cve": "CVE-2026-45858",
      "id": "CVE-2026-45858",
      "initial_release_date": "2026-05-28T03:57:23Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "649",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45858",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45858.json",
      "version": "16"
    }
  }
}



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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.


Related by attack behaviour

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.