CVE-2018-14633
An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (8.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely. Kernel versions 4.18.x, 4.14.x and 3.10.x are believed to be vulnerable.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
- EPSS
- 8.74% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-121, CWE-787
- Affected
- linux/linux kernel · canonical/ubuntu linux · debian/debian linux · redhat/enterprise linux eus · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server tus · redhat/enterprise linux workstation
- Source
- secalert@redhat.com
EPSS 8.7% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/105388Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3651Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3666Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1946Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92cPatch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fePatch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.htmlMailing List, Third Party Advisory
- https://seclists.org/oss-sec/2018/q3/270Mailing List, Third Party Advisory
- https://usn.ubuntu.com/3775-1/Third Party Advisory
- https://usn.ubuntu.com/3775-2/Third Party Advisory
- https://usn.ubuntu.com/3776-1/Third Party Advisory
- https://usn.ubuntu.com/3776-2/Third Party Advisory
- https://usn.ubuntu.com/3777-1/Third Party Advisory
- https://usn.ubuntu.com/3777-2/Third Party Advisory
- https://usn.ubuntu.com/3777-3/Third Party Advisory
- https://usn.ubuntu.com/3779-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4308Third Party Advisory
- http://www.securityfocus.com/bid/105388Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3651Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3666Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1946Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92cPatch, Vendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fePatch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.htmlMailing List, Third Party Advisory
- https://seclists.org/oss-sec/2018/q3/270Mailing List, Third Party Advisory
- https://usn.ubuntu.com/3775-1/Third Party Advisory
- https://usn.ubuntu.com/3775-2/Third Party Advisory
- https://usn.ubuntu.com/3776-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.