CVE-2017-7495

Impact:
Moderate
Public Date:
2017-05-12
CWE:
CWE-665
Bugzilla:
1450261: CVE-2017-7495 kernel: ext4: power failure during write(2) causes on-disk information leak
A vulnerability was found in the Linux kernel where filesystems mounted with data=ordered mode may allow an attacker to read stale data from recently allocated blocks in new files after a system 'reset' by abusing ext4 mechanics of delayed allocation.

Find out more about CVE-2017-7495 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases may address this issue.
fs

CVSS v3 metrics

CVSS3 Base Score 6.2
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact None
Availability Impact None

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel) RHSA-2017:1842 2017-08-01
Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2017:2669 2017-09-06
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2017:2077 2017-08-01

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 7 kernel-alt Not affected
Red Hat Enterprise Linux 6 kernel Not affected
Red Hat Enterprise Linux 5 kernel Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

Red Hat would like to thank Takeshi Nishimura (NEC) for reporting this issue.

Mitigation

Alternative filesystems may be used in place of ext4 in case of sensitive data leak. Alternatively, don't hard reset the system.

External References

Last Modified