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CVE-2026-45858— ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1

AI Predicted 7.8 Difficulty: Hard EPSS 0.02% · P7

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxdee1f973ca341c266229faa5a1a5bb268bed3531< 58ddae5d77b1db3a27b891c75a8fa120239ac092affected
dee1f973ca341c266229faa5a1a5bb268bed3531< d17857b4fb9ba5745b59be0ef38fd532991fccbfaffected
dee1f973ca341c266229faa5a1a5bb268bed3531< d67c8ecf3d8fda9b8ef80e6f665d84b6d6ac9d88affected
dee1f973ca341c266229faa5a1a5bb268bed3531< 7015fcf473796e1d2d876f241bd9e0c36f3d4eefaffected
dee1f973ca341c266229faa5a1a5bb268bed3531< 1bf6974822d1dba86cf11b5f05498581cf3488a2affected
814a7833df19e1de7447f870ae890adb12561627affected
4319fd00002630a761fa5559a086f11ed7623006affected
e28b27be06c5e6a5236c0c0b370ca0768ab086bbaffected
… +10 more rows
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I. Basic Information for CVE-2026-45858

Vulnerability Information
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Vulnerability Title
ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4模块在分割未写入范围时可能导致陈旧数据问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux dee1f973ca341c266229faa5a1a5bb268bed3531 ~ 58ddae5d77b1db3a27b891c75a8fa120239ac092 -
LinuxLinux 3.7 -

II. Public POCs for CVE-2026-45858

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III. Intelligence Information for CVE-2026-45858

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Patches & Fixes for CVE-2026-45858 (5)

Same Patch Batch · Linux · 2026-05-27 · 276 CVEs total

CVE-2026-460399.8 CRITICALrxgk: Fix potential integer overflow in length check
CVE-2026-458989.8 CRITICALRDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-459889.8 CRITICALrxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-459729.8 CRITICALsmb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-460439.1 CRITICALRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-460568.8 HIGHBluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-459458.8 HIGHiommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-460378.2 HIGHipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-458438.2 HIGHslip: bound decode() reads against the compressed packet length
CVE-2026-460108.1 HIGHrxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-460998.1 HIGHnet: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-460767.9 HIGHKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-458787.8 HIGHdrm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-459597.8 HIGHcrypto: ccp - Fix a crash due to incorrect cleanup usage of kfree
CVE-2026-460117.8 HIGHmedia: mtk-jpeg: fix use-after-free in release path due to uncancelled work
CVE-2026-458947.8 HIGHiommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-460157.8 HIGHtcp: call sk_data_ready() after listener migration
CVE-2026-458527.8 HIGHRDMA/rxe: Fix double free in rxe_srq_from_init
CVE-2026-460537.8 HIGHnet: rds: fix MR cleanup on copy error
CVE-2026-458627.8 HIGHiommu/vt-d: Flush cache for PASID table before using it

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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