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
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.
- BDU:2019-01738
- DLA-1529-1
- DLA-1531-1
- DSA-4308-1
- RHSA-2018:3651
- RHSA-2018:3666
- RHSA-2019:1946
- SUSE-SU-2018:3158-1
- SUSE-SU-2018:3159-1
- SUSE-SU-2018:3164-1
- SUSE-SU-2018:3171-1
- SUSE-SU-2018:3172-1
- SUSE-SU-2018:3173-1
- SUSE-SU-2018:3238-1
- SUSE-SU-2018:3265-1
- SUSE-SU-2018:3268-1
- SUSE-SU-2018:3272-1
- SUSE-SU-2018:3328-1
- SUSE-SU-2018:3331-1
- SUSE-SU-2018:3470-1
- Published
- Sep 24, 2018
- Updated
- Jun 16, 2026
- EPSS
- 8.7% · 95th percentile
- CWE
- CWE-121
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 8.7%
CNA vs NVD score
- NVD
- 7.0
- CNA · redhat
- 7.0
- agree
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server tus | cpe:2.3:o:redhat:enterprise_linux_server_tus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux12.04
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- debian debian linux8.0
- debian debian linux9.0
- linux linux kernel3.1 and later · before 3.16.59
- linux linux kernel3.17 and later · before 3.18.124
- linux linux kernel3.19 and later · before 4.4.159
- linux linux kernel4.5 and later · before 4.9.130
- linux linux kernel4.10 and later · before 4.14.73
- linux linux kernel4.15 and later · before 4.18.11
- redhat enterprise linux eus7.4
- redhat enterprise linux eus7.6
- redhat enterprise linux server7.0
- redhat enterprise linux server aus7.4
- redhat enterprise linux server aus7.6
- redhat enterprise linux server tus7.4
- redhat enterprise linux server tus7.6
- redhat enterprise linux workstation7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
The Linux Foundation kernel
- 4.18.x, 4.14.x, 3.10.xaffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 4.18.10-1 | 4.18.10-1 |
| Debian:8 | linux | before 3.16.59-1 | 3.16.59-1 |
| Debian:8 | linux-4.9 | before 4.9.110-3+deb9u5~deb8u1 | 4.9.110-3+deb9u5~deb8u1 |
| Debian:9 | linux | before 4.9.110-3+deb9u5 | 4.9.110-3+deb9u5 |
| Red Hat:enterprise_linux:7::client | bpftool | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-abi-whitelists | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-debug | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-debug-debuginfo | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-debug-devel | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-debuginfo | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-debuginfo-common-x86_64 | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-devel | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-doc | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-headers | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-tools | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-tools-debuginfo | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-tools-libs | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | kernel-tools-libs-devel | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | perf | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | perf-debuginfo | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | python-perf | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::client | python-perf-debuginfo | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
| Red Hat:enterprise_linux:7::server | kernel-bootwrapper | before 0:3.10.0-957.1.3.el7 | 0:3.10.0-957.1.3.el7 |
+96
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:linux | 4.18.10-1 · Debian:12 | Package registry (OSV) |
| debian:linux-4.9 | 4.9.110-3+deb9u5~deb8u1 · Debian:8 | Package registry (OSV) |
| red hat:bpftool | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-abi-whitelists | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-debuginfo-common-x86_64 | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-devel | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-doc | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-headers | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:kernel-tools | 0:3.10.0-957.1.3.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:kernel-default | 4.12.14-25.22.1 · SUSE:Linux Enterprise Live Patching 15 | Package registry (OSV) |
| suse:kernel-docs | 4.12.14-25.22.2 · SUSE:Linux Enterprise Module for Development Tools 15 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15_Update_6 | 1-1.3.1 · SUSE:Linux Enterprise Live Patching 15 | Package registry (OSV) |
| suse:kernel-obs-build | 4.12.14-25.22.1 · SUSE:Linux Enterprise Module for Development Tools 15 | Package registry (OSV) |
| suse:kernel-source | 4.12.14-25.22.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
| suse:kernel-syms | 4.12.14-25.22.1 · SUSE:Linux Enterprise Module for Development Tools 15 | Package registry (OSV) |
| suse:kernel-vanilla | 4.12.14-25.22.1 · SUSE:Linux Enterprise Module for Development Tools 15 | Package registry (OSV) |
| suse:kernel-zfcpdump | 4.12.14-25.22.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP3_Update_4 | 11-2.1 · SUSE:Linux Enterprise Live Patching 12 SP3 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP3_Update_5 | 10-2.1 · SUSE:Linux Enterprise Live Patching 12 SP3 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP3_Update_6 | 10-2.1 · SUSE:Linux Enterprise Live Patching 12 SP3 | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP3_Update_7 | 10-2.1 · SUSE:Linux Enterprise Live Patching 12 SP3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- High
Weakness class (CWE)
CWE-121 · Stack-based Buffer OverflowCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.securityfocus.com/bid/105388
- access.redhat.com/errata/RHSA-2018:3651
- access.redhat.com/errata/RHSA-2018:3666
- access.redhat.com/errata/RHSA-2019:1946
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633
- git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c
- git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe
- lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- seclists.org/oss-sec/2018/q3/270
- usn.ubuntu.com/3775-1/
- usn.ubuntu.com/3775-2/
- usn.ubuntu.com/3776-1/
- usn.ubuntu.com/3776-2/
- usn.ubuntu.com/3777-1/
- usn.ubuntu.com/3777-2/
- usn.ubuntu.com/3777-3/
- usn.ubuntu.com/3779-1/
- www.debian.org/security/2018/dsa-4308
Vendor advisories and official records. Exploit/PoC links are deliberately left out.