Description
A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| [UNKNOWN] | kernel: | — | — |
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 | 4.19.16-1 | — |
| Debian 13 | linux | 4.19.16-1 | — |
| Debian 12 | linux | 4.19.16-1 | — |
| Debian 8 | linux | 3.16.64-1 | DLA-1731-1 |
| Debian 8 | linux-4.9 | 4.9.168-1~deb8u1 | DLA-1771-1 |
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 18.04 LTS | linux | 4.15.0-50.54 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1039.41 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.18.0-1018.18~18.04.1 | USN-3980-2 |
| Ubuntu 18.04 LTS | linux-gcp +1 | 4.15.0-1032.34 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-gcp-edge | 4.18.0-1011.12~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe | 4.18.0-20.21~18.04.1 | USN-3980-2 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1034.34 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1038.43 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1013.15 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1036.38 | USN-3981-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1053.57 | USN-3981-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-145.171 | USN-3932-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1079.89 | USN-3932-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1039.41~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1045.49 | USN-3981-2 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1032.34~16.04.1 | USN-3981-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-50.54~16.04.1 | USN-3981-2 |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1043.49 | USN-3932-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1013.15~16.04.1 | USN-3981-2 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1106.114 | USN-3932-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1110.115 | USN-3932-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-aws | 4.4.0-1040.43 | USN-3932-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1045.49~14.04.1 | USN-3981-2 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-144.170~14.04.1 | USN-3932-2 |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1008.10 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-147.rt24.93.el8 | RHSA-2019:3309 |
| RHEL 8 | perf +26 | 4.18.0-147.el8 | RHSA-2019:3517 |
| RHEL 7 | kernel-alt | 4.14.0-115.26.1.el7a | RHSA-2020:2854 |
| RHEL 7 | kernel-rt +10 | 3.10.0-957.27.2.rt56.940.el7 | RHSA-2019:1891 |
| RHEL 7 | perf +19 | 3.10.0-957.27.2.el7 | RHSA-2020:2854, RHSA-2019:1873 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | perf +18 | 4.18.0-80.15.1.el8_0 | RHSA-2020:0204 |
| RHEL 7.4 EUS | perf +17 | 3.10.0-693.58.1.el7 | RHSA-2019:2696 |
| Red Hat MRG 2 | kernel-rt +10 | 1:3.10.0-693.58.1.rt56.652.el6rt | RHSA-2019:2730 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | kernel-azure +2 | 4.12.14-5.19.1 | SUSE-SU-2019:0150-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-25.28.1 | SUSE-SU-2019:0224-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.6.2 | SUSE-SU-2019:0222-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.6.1 | SUSE-SU-2019:0196-1 |
| SLES 12 SP3 | kernel-azure +2 | 4.4.170-4.22.1 | SUSE-SU-2019:0148-1 |
| SLES 12 SP3 | kernel-docs +4 | 4.4.175-94.79.1 | SUSE-SU-2019:0541-1 |
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.101.1 | SUSE-SU-2019:0439-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_18 +1 | 11-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_20 | 10-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 +1 | 9-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 | 6-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_24 | 5-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 4-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_26 | 3-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_27 | 1-3.3.1 | SUSE-SU-2019:0439-1 |
| 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_25 +1 | 11-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_27 | 9-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_28 +1 | 8-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_30 | 7-2.1 | SUSE-SU-2019:0356-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_31 +1 | 5-2.1 | SUSE-SU-2019:0356-1 |
| 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 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | kernel-ec2 | 3.12.74-60.64.110.1 | SUSE-SU-2019:1289-1 |
| SLES 12 | kgraft-patch-SLE12_Update_31 +1 | 12-2.1 | SUSE-SU-2019:0326-1 |
| SLES 12 | kgraft-patch-SLE12_Update_33 | 11-2.1 | SUSE-SU-2019:0326-1 |
| SLES 12 | kgraft-patch-SLE12_Update_34 | 9-2.1 | SUSE-SU-2019:0326-1 |
| SLES 12 | kgraft-patch-SLE12_Update_35 +1 | 8-2.1 | SUSE-SU-2019:0326-1 |
| SLES 12 | kgraft-patch-SLE12_Update_37 | 7-2.1 | SUSE-SU-2019:0326-1 |
| SLES 12 | kgraft-patch-SLE12_Update_38 | 5-2.1 | SUSE-SU-2019:0326-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.6.2 | SUSE-SU-2019:0222-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.6.1 | SUSE-SU-2019:0196-1 |
| SLES for SAP 12 SP3 | kernel-azure +2 | 4.4.170-4.22.1 | SUSE-SU-2019:0148-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.175-94.79.1 | SUSE-SU-2019:0541-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.101.1 | SUSE-SU-2019:0439-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_18 +1 | 11-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_20 | 10-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_21 +1 | 9-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_23 | 6-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_24 | 5-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 4-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_26 | 3-2.1 | SUSE-SU-2019:0356-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_27 | 1-3.3.1 | SUSE-SU-2019:0439-1 |
| 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 |
| SLE Real Time 12 SP3 | kernel-rt +1 | 4.4.170-3.32.2 | SUSE-SU-2019:0320-1 |
| SLE Real Time 12 SP3 | kernel-syms-rt +1 | 4.4.170-3.32.1 | SUSE-SU-2019:0320-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-25.28.1 | SUSE-SU-2019:0224-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_0 | 8-22.2 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_1 +1 | 7-2.1 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_3 | 5-2.1 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_4 +1 | 4-2.1 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_6 | 3-2.1 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_7 | 2-2.1 | SUSE-SU-2019:0236-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_8 | 1-1.3.1 | SUSE-SU-2019:0224-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_0 | 3-2.7.2 | SUSE-SU-2019:0298-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_1 | 2-2.1 | SUSE-SU-2019:0298-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_2 | 1-6.3.1 | SUSE-SU-2019:0196-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_10 +1 | 10-2.1 | SUSE-SU-2019:0298-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_12 | 8-2.1 | SUSE-SU-2019:0298-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_23 | 1-4.7.1 | SUSE-SU-2019:0541-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_8 +1 | 11-2.1 | SUSE-SU-2019:0298-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.101.1 | SUSE-SU-2019:0439-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_27 | 1-3.3.1 | SUSE-SU-2019:0439-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.101.1 | SUSE-SU-2019:0439-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_27 | 1-3.3.1 | SUSE-SU-2019:0439-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | kernel-source | 4.12.14-lp150.12.45.1 | openSUSE-SU-2019:0065-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +8 | 4.14.94-89.73.amzn2 | ALAS2-2019-1149 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-147.el8 | ELSA-2019-3517 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.49.1.el6uek | 0.4.5-3.el6 | ELSA-2020-5841 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.49.1.el7uek | 0.4.5-3.el7 | ELSA-2020-5841 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.49.1.el7uek | ELSA-2020-5866, ELSA-2020-5845, ELSA-2020-5841 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-1902.306.2.el7uek | ELSA-2020-5845 |
| Oracle Linux 7 | perf +12 | 3.10.0-957.27.2.el7 | ELSA-2020-5845, ELSA-2019-1873 |
Advisories 35
- USN-3932-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- RHSA-2019:3517 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2020:0204 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:2730 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:2696 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:2854 Red Hat Security Advisory: kernel-alt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:3309 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:1891 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:1873 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-3932-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3981-2 linux-hwe, linux-azure, linux-gcp, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Jun 1, 2026
- USN-3981-1 linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 1, 2026
- USN-3980-2 linux-hwe, linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 1, 2026
- DLA-1731-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1771-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0222-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0150-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0326-1 Security update for the Linux Kernel (Live Patch 35 for SLE 12) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0224-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0320-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0148-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0196-1 Security update for the Linux Kernel 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-2019:0356-1 Security update for the Linux Kernel (Live Patch 25 for SLE 12 SP2) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0541-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0236-1 Security update for the Linux Kernel (Live Patch 0 for SLE 15) SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:0065-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2019:0298-1 Security update for the Linux Kernel (Live Patch 0 for SLE 12 SP4) SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2019:0439-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2020-5866 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-5845 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2020
- ELSA-2020-5841 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 10, 2020
- ELSA-2019-3517 Important: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ELSA-2019-1873 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1149 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 25, 2019
References
- 106253 vdb-entry
- [debian-lts-announce] 20190327 [SECURITY] [DLA 1731-1] linux security update mailing-list
- [debian-lts-announce] 20190401 [SECURITY] [DLA 1731-2] linux regression update mailing-list
- USN-3932-1 vendor-advisory
- USN-3932-2 vendor-advisory
- [debian-lts-announce] 20190503 [SECURITY] [DLA 1771-1] linux-4.9 security update mailing-list
- USN-3981-1 vendor-advisory
- USN-3980-1 vendor-advisory
- USN-3980-2 vendor-advisory
- USN-3981-2 vendor-advisory
- RHSA-2019:1873 vendor-advisory
- RHSA-2019:1891 vendor-advisory
- RHSA-2019:2696 vendor-advisory
- RHSA-2019:2730 vendor-advisory
- RHSA-2019:3309 vendor-advisory
- RHSA-2019:3517 vendor-advisory
- RHSA-2020:0204 vendor-advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884
- https://patchwork.kernel.org/patch/10733769/
- https://patchwork.kernel.org/cover/10733767/
- https://support.f5.com/csp/article/K21430012