CVE-2018-1095

low-risk
Published 2018-04-02

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

Do I need to act?

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0.15% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (14)

Mailing List http://openwall.com/lists/oss-security/2018/03/29/1
https://access.redhat.com/errata/RHSA-2018:2948
Exploit https://bugzilla.kernel.org/show_bug.cgi?id=199185
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1560793
Patch https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd1...
https://usn.ubuntu.com/3695-1/
https://usn.ubuntu.com/3695-2/
Mailing List http://openwall.com/lists/oss-security/2018/03/29/1
https://access.redhat.com/errata/RHSA-2018:2948
Exploit https://bugzilla.kernel.org/show_bug.cgi?id=199185
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1560793
Patch https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd1...
https://usn.ubuntu.com/3695-1/
https://usn.ubuntu.com/3695-2/
24
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal