{"id":"CVE-2018-1093","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-1093","generatedAt":"2026-10-28T20:11:28.024Z","title":"The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate…","description":"The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate bitmap block numbers.","published":"2018-04-02T03:29:00.000Z","lastModified":"2026-06-17T01:50:28.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.0","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"cwe":["CWE-125"],"affected":["linux/linux kernel"],"epss":{"score":0.01922,"percentile":0.79816,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.04,"percentile":0.90105},{"date":"2026-09-22","score":0.01922,"percentile":0.7903}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.92%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://openwall.com/lists/oss-security/2018/03/29/1","tags":["Mailing List"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.kernel.org/show_bug.cgi?id=199181","tags":["Issue Tracking"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1560782","tags":["Issue Tracking","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=7dac4a1726a9c64a517d595c40e95e2d0d135f6f","tags":["Patch"],"source":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html","source":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html","source":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3676-1/","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3676-2/","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3752-1/","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3752-2/","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3752-3/","source":"secalert@redhat.com"},{"url":"https://usn.ubuntu.com/3754-1/","source":"secalert@redhat.com"},{"url":"https://www.debian.org/security/2018/dsa-4188","source":"secalert@redhat.com"},{"url":"http://openwall.com/lists/oss-security/2018/03/29/1","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.kernel.org/show_bug.cgi?id=199181","tags":["Issue Tracking"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1560782","tags":["Issue Tracking","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=7dac4a1726a9c64a517d595c40e95e2d0d135f6f","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3676-1/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3676-2/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3752-1/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3752-2/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3752-3/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3754-1/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2018/dsa-4188","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-1093","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}