Description
The Linux kernel before version 4.11 is vulnerable to a NULL pointer dereference in fs/cifs/cifsencrypt.c:setup_ntlmv2_rsp() that allows an attacker controlling a CIFS server to kernel panic a client that has this server mounted, because an empty TargetInfo field in an NTLMSSP setup negotiation response is mishandled during session recovery.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Linux kernel 4.11 | Linux kernel 4.11 | — |
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 | 4.11.6-1 | — |
| Debian 13 | linux | 4.11.6-1 | — |
| Debian 12 | linux | 4.11.6-1 | — |
| Debian 9 | linux | 4.9.88-1 | DSA-4188-1 |
| Debian 8 | linux | 3.16.56-1 | DSA-4187-1, DLA-1422-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-87.110 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1026.35 | — |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1022.22 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.8.0-56.61~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1065.73 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1067.72 | — |
| Ubuntu 14.04 LTS | linux | 3.13.0-165.215 | USN-3880-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-87.110~14.04.1 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | perf +18 | 3.10.0-862.el7 | RHSA-2018:1062 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.125.1 | SUSE-SU-2018:0848-1, SUSE-SU-2018:0834-1 |
| SLES 12 | kgraft-patch-SLE12_Update_33 | 1-1.3.1 | SUSE-SU-2018:0834-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
| SUSE OpenStack Cloud 6 | kernel-xen +3 | 3.12.74-60.64.85.1 | SUSE-SU-2018:0848-1 |
| SUSE OpenStack Cloud 6 | kgraft-patch-SLE12-SP1_Update_26 | 1-2.3.1 | SUSE-SU-2018:0848-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.26.7.el7uek | ELSA-2019-4596 |
Advisories 9
- RHSA-2018:1062 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3880-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4188-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4187-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1422-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:0834-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-0532 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 11, 2025
- SUSE-SU-2018:0848-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2019-4596 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 31, 2019
References
- [debian-lts-announce] 20180714 [SECURITY] [DLA 1422-1] linux security update mailing-list
- DSA-4187 vendor-advisory
- [debian-lts-announce] 20180715 [SECURITY] [DLA 1422-2] linux security update mailing-list
- https://github.com/torvalds/linux/commit/cabfb3680f78981d26c078a26e5c748531257ebb
- DSA-4188 vendor-advisory
- USN-3880-1 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1539599
- USN-3880-2 vendor-advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cabfb3680f78981d26c078a26e5c748531257ebb
- https://patchwork.kernel.org/patch/10187633/
- 103378 vdb-entry