Description
In the Linux kernel 4.13 through 4.16.11, ext4_read_inline_data() in fs/ext4/inline.c performs a memcpy with an untrusted length value in certain circumstances involving a crafted filesystem that stores the system.data extended attribute value in a dedicated inode.
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 | 4.17.3-1 | — |
| Debian 13 | linux | 4.17.3-1 | — |
| Debian 12 | linux | 4.17.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | linux | 4.15.0-33.36 | USN-3752-1 |
| Ubuntu 18.04 LTS | linux-aws +1 | 4.15.0-1020.20 | USN-3752-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.15.0-1022.23 | USN-3752-3 |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1018.19 | USN-3752-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1017.20 | USN-3752-3 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1021.23 | USN-3752-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1022.22~16.04.1 | USN-3752-3 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1018.19~16.04.2 | USN-3752-3 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-33.36~16.04.1 | USN-3752-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | perf +14 | 4.14.0-115.6.1.el7a | RHSA-2019:0525 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | perf +7 | 4.14.55-68.37.amzn2 | ALAS2-2018-1046 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Linux Kernel < 4.16.11 - 'ext4_read_inline_data()' Memory Corruption EDB-44832 · dos · Jun 5, 2018
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 5
- RHSA-2019:0525 Red Hat Security Advisory: kernel-alt security and bug fix update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- USN-3752-1 linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3752-3 linux-azure, linux-oem, linux-gcp vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3752-2 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ALAS2-2018-1046 Moderate: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 8, 2025
References
- USN-3752-2 vendor-advisory
- 104291 vdb-entry
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1580
- USN-3752-3 vendor-advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199803
- 44832 exploit
- RHSA-2019:0525 vendor-advisory
- USN-3752-1 vendor-advisory