Description
The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.9.8 does not properly validate meta block groups, which allows physically proximate attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image.
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 | 4.9.10-1 | — |
| Debian 13 | linux | 4.9.10-1 | — |
| Debian 12 | linux | 4.9.10-1 | — |
| Debian 7 | linux | 3.2.96-1 | DLA-1200-1 |
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 | 4.4.0-67.88 | USN-3234-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1009.18 | USN-3234-1 |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1006.6 | USN-3234-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.10.0-32.36~16.04.1 | USN-3361-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1048.55 | USN-3234-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1051.55 | USN-3234-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-157.207 | USN-3754-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-67.88~14.04.1 | USN-3234-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-514.21.1.rt56.438.el7 | RHSA-2017:1298 |
| RHEL 7 | perf +18 | 3.10.0-514.21.1.el7 | RHSA-2017:1308 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat MRG 2 | kernel-rt +10 | 1:3.10.0-514.rt56.221.el6rt | RHSA-2017:1297 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | kernel-docs | 3.12.74-60.64.40.4 | SUSE-SU-2017:1360-1 |
| SLES 12 SP1 | kernel-xen +4 | 3.12.74-60.64.40.1 | SUSE-SU-2017:1360-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.72.1 | SUSE-SU-2017:1360-1, SUSE-SU-2017:1247-1 |
| SLES 12 | kgraft-patch-SLE12_Update_21 | 1-2.1 | SUSE-SU-2017:1247-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.40.1 | SUSE-SU-2017:1360-1 |
| SLES for SAP 12 | kernel-xen +3 | 3.12.61-52.72.1 | SUSE-SU-2017:1247-1 |
| SLES for SAP 12 | kgraft-patch-SLE12_Update_21 | 1-2.1 | SUSE-SU-2017:1247-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP1_Update_15 | 1-4.1 | SUSE-SU-2017:1360-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.18.2.el6uek | 0.4.5-3.el6 | ELSA-2017-3566 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.18.2.el7uek | 0.4.5-3.el7 | ELSA-2017-3566 |
| Oracle Linux 7 | dtrace-modules-4.1.12-61.1.34.el6uek | 0.5.3-2.el6 | ELSA-2017-3539 |
| Oracle Linux 7 | dtrace-modules-4.1.12-61.1.34.el7uek | 0.5.3-2.el7 | ELSA-2017-3539 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.18.2.el7uek | ELSA-2017-3566, ELSA-2017-3539 |
| Oracle Linux 7 | perf +11 | 3.10.0-514.21.1.el7 | ELSA-2017-1308 |
Advisories 13
- RHSA-2017:1308 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:1298 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2017:1297 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3361-1 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3754-1 linux vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3234-1 linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1200-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3234-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:1247-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1360-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2017-1308 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 26, 2017
- ELSA-2017-3566 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 16, 2017
- ELSA-2017-3539 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 13, 2017
References
- [oss-security] 20170204 Re: Local DoS: Linux Kernel EXT4 Memory Corruption / SLAB-Out-of-Bounds Read mailing-list
- 94354 vdb-entry
- RHSA-2017:1308 vendor-advisory
- [debian-lts-announce] 20171210 [SECURITY] [DLA 1200-1] linux security update mailing-list
- https://github.com/torvalds/linux/commit/3a4b77cd47bb837b8557595ec7425f281f2ca1fe
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3a4b77cd47bb837b8557595ec7425f281f2ca1fe
- USN-3754-1 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1395190
- RHSA-2017:1298 vendor-advisory
- 20161115 OS-S 2016-22 - Local DoS: Linux Kernel EXT4 Memory Corruption / SLAB-Out-of-Bounds Read mailing-list
- RHSA-2017:1297 vendor-advisory