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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Linux Foundation | kernel | 4.18.x, 4.14.x, 3.10.x | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.18.10-1 | — |
| Debian 13 | linux | 4.18.10-1 | — |
| Debian 12 | linux | 4.18.10-1 | — |
| Debian 9 | linux | 4.9.110-3+deb9u5 | DSA-4308-1 |
| Debian 8 | linux | 3.16.59-1 | DLA-1529-1 |
| Debian 8 | linux-4.9 | 4.9.110-3+deb9u5~deb8u1 | DLA-1531-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-36.39 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-aws +1 | 4.15.0-1023.23 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1025.26 | USN-3777-3 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1021.22 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1021.24 | USN-3777-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1024.26 | USN-3777-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-137.163 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1069.79 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1025.26~16.04.1 | USN-3777-3 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1021.22~16.04.1 | USN-3777-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-36.39~16.04.1 | USN-3777-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1035.41 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1098.106 | USN-3776-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1102.107 | USN-3776-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-160.210 | USN-3775-1 |
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1031.34 | USN-3776-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1031.32~14.04.1 | — |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-137.163~14.04.1 | USN-3776-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-957.1.3.rt56.913.el7 | RHSA-2018:3666 |
| RHEL 7 | perf +19 | 3.10.0-957.1.3.el7 | RHSA-2018:3651 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.4 EUS | perf +18 | 3.10.0-693.55.1.el7 | RHSA-2019:1946 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | kernel-azure +2 | 4.12.14-5.16.1 | SUSE-SU-2018:3961-1 |
| SLES 15 | kernel-docs | 4.12.14-25.22.2 | SUSE-SU-2018:3159-1 |
| SLES 15 | kernel-syms +5 | 4.12.14-25.22.1 | SUSE-SU-2018:3159-1 |
| SLES 12 SP3 | kernel-azure | 4.4.162-4.19.2 | SUSE-SU-2019:0095-1 |
| SLES 12 SP3 | kernel-docs +4 | 4.4.162-94.69.2 | SUSE-SU-2018:3689-1 |
| SLES 12 SP3 | kernel-syms-azure +1 | 4.4.162-4.19.1 | SUSE-SU-2019:0095-1 |
| SLES 12 SP3 | lttng-modules | 2.7.1-8.6.1 | SUSE-SU-2018:3689-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.104.1 | SUSE-SU-2019:0828-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_14 +1 | 11-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_16 +1 | 10-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_18 +1 | 8-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_20 | 7-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 +1 | 6-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 +1 | 4-2.1 | SUSE-SU-2018:3173-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 +1 | 2-2.1 | SUSE-SU-2018:3789-1, SUSE-SU-2018:3470-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_28 | 1-3.3.1 | SUSE-SU-2019:0828-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_22 | 10-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_23 | 9-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_24 +2 | 8-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_27 | 6-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_28 +1 | 5-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_30 | 4-2.1 | SUSE-SU-2018:3171-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_31 +1 | 2-2.1 | SUSE-SU-2018:3328-1, SUSE-SU-2018:3172-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_33 | 1-2.3.1 | SUSE-SU-2019:1289-1 |
| SLES 12 SP1 | lttng-modules | 2.7.0-4.4.1 | SUSE-SU-2019:1289-1 |
| SLES 12 | kernel-ec2 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES 12 | kgraft-patch-SLE12_Update_28 +1 | 10-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_30 +2 | 9-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_33 | 8-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_34 | 6-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_35 +1 | 5-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_37 | 4-2.1 | SUSE-SU-2018:3238-1 |
| SLES 12 | kgraft-patch-SLE12_Update_38 | 2-2.1 | SUSE-SU-2018:3265-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | kernel-ec2 +9 | 3.0.101-108.81.1 | SUSE-SU-2018:3746-1 |
| SLES 11 SP3 | kernel-ec2 +7 | 3.0.101-0.47.106.56.1 | SUSE-SU-2018:3618-1 |
| SLES for SAP 12 SP3 | kernel-azure | 4.4.162-4.19.2 | SUSE-SU-2019:0095-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.162-94.69.2 | SUSE-SU-2018:3689-1 |
| SLES for SAP 12 SP3 | kernel-syms-azure +1 | 4.4.162-4.19.1 | SUSE-SU-2019:0095-1 |
| SLES for SAP 12 SP3 | lttng-modules | 2.7.1-8.6.1 | SUSE-SU-2018:3689-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.104.1 | SUSE-SU-2019:0828-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_14 +1 | 11-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_16 +1 | 10-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_18 +1 | 8-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_20 | 7-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 +1 | 6-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 +1 | 4-2.1 | SUSE-SU-2018:3173-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 +1 | 2-2.1 | SUSE-SU-2018:3789-1, SUSE-SU-2018:3470-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_28 | 1-3.3.1 | SUSE-SU-2019:0828-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_33 | 1-2.3.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 12 SP1 | lttng-modules | 2.7.0-4.4.1 | SUSE-SU-2019:1289-1 |
| SLES for SAP 11 SP4 | kernel-ec2 +8 | 3.0.101-108.81.1 | SUSE-SU-2018:3746-1 |
| SLE Real Time 12 SP3 | kernel-rt +3 | 4.4.162-3.26.1 | SUSE-SU-2018:3773-1, SUSE-SU-2018:3659-1 |
| SLE Real Time 11 SP4 | kernel-rt +3 | 3.0.101.rt130-69.39.1 | SUSE-SU-2018:3869-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-25.22.1 | SUSE-SU-2018:3158-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_0 | 5-13.2 | SUSE-SU-2018:3272-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_1 +1 | 5-2.1 | SUSE-SU-2018:3272-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_3 | 4-2.1 | SUSE-SU-2018:3331-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_4 | 3-2.1 | SUSE-SU-2018:3272-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_5 | 2-2.1 | SUSE-SU-2018:3272-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_6 | 1-1.3.1 | SUSE-SU-2018:3158-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_10 +1 | 7-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_12 +1 | 5-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_14 +1 | 4-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_16 | 3-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_17 +3 | 2-2.1 | SUSE-SU-2018:3867-1, SUSE-SU-2018:3268-1, SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_21 | 1-4.5.2 | SUSE-SU-2018:3688-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_4 | 11-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_5 +2 | 10-2.1 | SUSE-SU-2018:3164-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_8 +1 | 8-2.1 | SUSE-SU-2018:3164-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.104.1 | SUSE-SU-2019:0828-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_28 | 1-3.3.1 | SUSE-SU-2019:0828-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | kernel-ec2 +6 | 3.0.101-0.47.106.56.1 | SUSE-SU-2018:3618-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.104.1 | SUSE-SU-2019:0828-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_28 | 1-3.3.1 | SUSE-SU-2019:0828-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +7 | 4.14.72-73.55.amzn2 | ALAS2-2018-1086 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.28.1.el7uek | ELSA-2019-4670 |
| Oracle Linux 7 | perf +12 | 3.10.0-957.1.3.el7 | ELSA-2018-3651 |
Advisories 41
- RHSA-2019:1946 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:3666 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:3651 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3777-3 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3777-1 linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3776-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3775-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4308-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1529-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1531-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3777-2 linux-hwe, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3776-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2018:3268-1 Security update for the Linux Kernel (Live Patch 19 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3331-1 Security update for the Linux Kernel (Live Patch 3 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3789-1 Security update for the Linux Kernel (Live Patch 26 for SLE 12 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3618-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3159-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3172-1 Security update for the Linux Kernel (Live Patch 31 for SLE 12 SP1) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1289-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3659-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3688-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3158-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0828-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3265-1 Security update for the Linux Kernel (Live Patch 38 for SLE 12) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3238-1 Security update for the Linux Kernel (Live Patch 29 for SLE 12) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3689-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3961-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3328-1 Security update for the Linux Kernel (Live Patch 32 for SLE 12 SP1) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3746-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3470-1 Security update for the Linux Kernel (Live Patch 25 for SLE 12 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3164-1 Security update for the Linux Kernel (Live Patch 17 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3173-1 Security update for the Linux Kernel (Live Patch 18 for SLE 12 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3867-1 Security update for the Linux Kernel (Live Patch 20 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3272-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3171-1 Security update for the Linux Kernel (Live Patch 30 for SLE 12 SP1) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:3773-1 Security update for the Linux RT Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2019:0095-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2018:3869-1 Security update for the Linux RT Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2019-4670 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 4, 2019
- ELSA-2018-3651 Moderate: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 27, 2018
- ALAS2-2018-1086 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 10, 2018
References
- USN-3776-1 vendor-advisory
- USN-3776-2 vendor-advisory
- USN-3777-1 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14633
- USN-3775-1 vendor-advisory
- https://seclists.org/oss-sec/2018/q3/270
- [debian-lts-announce] 20181003 [SECURITY] [DLA 1531-1] linux-4.9 security update mailing-list
- USN-3779-1 vendor-advisory
- 105388 vdb-entry
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=8c39e2699f8acb2e29782a834e56306da24937fe
- RHSA-2018:3666 vendor-advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git/commit/?h=4.19/scsi-fixes&id=1816494330a83f2a064499d8ed2797045641f92c
- DSA-4308 vendor-advisory
- RHSA-2018:3651 vendor-advisory
- USN-3775-2 vendor-advisory
- USN-3777-2 vendor-advisory
- USN-3777-3 vendor-advisory
- RHSA-2019:1946 vendor-advisory