CVE-2026-74362

Data-integrity loss via discarded sync errors

Published Aug 15, 2026 · Updated Aug 15, 2026

Unchecked return handling in the Linux kernel ext2 filesystem allows local users to receive false write success after a failed synchronous direct-I/O write. ext2_dio_write_iter() discards errors from generic_write_sync() and filemap_write_and_wait() instead of returning them through write(2). Reachability requires an ext2 file opened with O_SYNC or O_DSYNC and an underlying synchronization failure, leaving applications unable to know that data was not durably stored.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unchecked return handling in the Linux kernel ext2 filesystem allows local users to receive false write success after a failed synchronous direct-I/O write. ext2_dio_write_iter() discards errors from generic_write_sync() and filemap_write_and_wait() instead of returning them through write(2). Reachability requires an ext2 file opened with O_SYNC or O_DSYNC and an underlying synchronization failure, leaving applications unable to know that data was not durably stored.

The record

CVE
CVE-2026-74362
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-252
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.5
  2. Affected versionversion=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <8990dbb7065b0b002b1e58b9091a5b61f5e94dbe
  3. Affected versionversion=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <8d70b3973020e59845c0bdad90e0b9c2295fd493
  4. Affected versionversion=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <a4659be0bc7cb1856ffb15b67f903229ae8891ec
  5. Affected versionversion=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <b6bc07e49a5fbb335f56eb90cd63dec6584c77d3
  6. Affected versionversion=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <ffa974b2f50ad8b911b9066d7aed84ad0afabcdb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <8990dbb7065b0b002b1e58b9091a5b61f5e94dbe; version=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <8d70b3973020e59845c0bdad90e0b9c2295fd493; version=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <a4659be0bc7cb1856ffb15b67f903229ae8891ec; version=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <b6bc07e49a5fbb335f56eb90cd63dec6584c77d3; version=fb5de4358e1aa4753dce73c4dc1aca73ff39cedd <ffa974b2f50ad8b911b9066d7aed84ad0afabcdb

Published CVSS scores

2.5SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-252Unchecked Return Value

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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