Description
The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This type value is uninitialized upon encountering certain error conditions. This value is used as an array index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the whole system.
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 | 4.9.30-1 | — |
| Debian 13 | linux | 4.9.30-1 | — |
| Debian 12 | linux | 4.9.30-1 | — |
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 16.04 LTS | linux | 4.4.0-83.106 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1022.31 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1002.5 | — |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-32.35~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1061.69 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1063.68 | — |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-83.106~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-693.rt56.617.el7 | RHSA-2017:2077 |
| RHEL 7 | perf +17 | 3.10.0-693.el7 | RHSA-2017:1842 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.3 EUS | perf +18 | 3.10.0-514.28.1.el7 | RHSA-2017:2437 |
| Red Hat MRG 2 | kernel-rt +10 | 1:3.10.0-693.2.1.rt56.585.el6rt | RHSA-2017:2669 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_0 | 8-18.7.1 | SUSE-SU-2017:2062-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_1 | 8-2.1 | SUSE-SU-2017:2067-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_2 +2 | 7-2.1 | SUSE-SU-2017:2068-1, SUSE-SU-2017:2065-1, SUSE-SU-2017:2043-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_5 | 5-2.1 | SUSE-SU-2017:2063-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_6 | 4-2.1 | SUSE-SU-2017:2070-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_7 +1 | 3-2.1 | SUSE-SU-2017:2064-1, SUSE-SU-2017:2046-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_9 | 2-2.1 | SUSE-SU-2017:2066-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +11 | 3.10.0-693.el7 | ELSA-2017-1842 |
Advisories 15
- RHSA-2017:2669 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:2077 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:1842 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2017:2437 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- SUSE-SU-2017:2063-1 Security update for Linux Kernel Live Patch 5 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2062-1 Security update for Linux Kernel Live Patch 0 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2068-1 Security update for Linux Kernel Live Patch 2 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2064-1 Security update for Linux Kernel Live Patch 7 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2066-1 Security update for Linux Kernel Live Patch 9 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2065-1 Security update for Linux Kernel Live Patch 4 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2046-1 Security update for Linux Kernel Live Patch 8 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2043-1 Security update for Linux Kernel Live Patch 3 for SLE 12 SP2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2070-1 Security update for Linux Kernel Live Patch 6 for SLE 12 SP2 SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2017:2067-1 Security update for Linux Kernel Live Patch 1 for SLE 12 SP2 SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2017-1842 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 7, 2017
References
- http://www.openwall.com/lists/oss-security/2017/06/27/5
- 1038790 vdb-entry
- RHSA-2017:2437 vendor-advisory
- https://github.com/torvalds/linux/commit/f961e3f2acae94b727380c0b74e2d3954d0edf79
- RHSA-2017:2669 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1466329
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f961e3f2acae94b727380c0b74e2d3954d0edf79
- https://github.com/torvalds/linux/commit/b550a32e60a4941994b437a8d662432a486235a5
- RHSA-2017:2077 vendor-advisory
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.3
- RHSA-2017:1842 vendor-advisory
- 99298 vdb-entry
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b550a32e60a4941994b437a8d662432a486235a5