What’s Vulnerable › Vulnerabilities

CVE-2018-1095

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-04-02 · updated 2026-06-17
• Weakness: CWE-476

Description

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.

Affected products

• Linux kernel: through 4.15.15

References

• http://openwall.com/lists/oss-security/2018/03/29/1
• https://access.redhat.com/errata/RHSA-2018:2948
• https://bugzilla.kernel.org/show_bug.cgi?id=199185
• https://bugzilla.redhat.com/show_bug.cgi?id=1560793
• https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401
• https://usn.ubuntu.com/3695-1/
• https://usn.ubuntu.com/3695-2/
• http://openwall.com/lists/oss-security/2018/03/29/1
• https://access.redhat.com/errata/RHSA-2018:2948
• https://bugzilla.kernel.org/show_bug.cgi?id=199185
• https://bugzilla.redhat.com/show_bug.cgi?id=1560793
• https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401

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