Description
The do_check function in kernel/bpf/verifier.c in the Linux kernel before 4.11.1 does not make the allow_ptr_leaks value available for restricting the output of the print_bpf_insn function, which allows local users to obtain sensitive address information via crafted bpf system calls.
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 18.04 LTS | linux-gcp +4 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-87.110 | USN-3364-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1026.35 | USN-3364-3 |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1022.22 | USN-3364-3 |
| Ubuntu 16.04 LTS | linux-hwe | 4.10.0-32.36~16.04.1 | USN-3361-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1065.73 | USN-3364-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1067.72 | USN-3364-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-87.110~14.04.1 | USN-3364-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-docs | 4.4.74-92.29.3 | SUSE-SU-2017:1853-1 |
| SLES 12 SP2 | kernel-syms +3 | 4.4.74-92.29.1 | SUSE-SU-2017:1853-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.74-92.29.1 | SUSE-SU-2017:1853-1 |
| SLE Real Time 12 SP2 | kernel-rt +3 | 4.4.74-7.10.1 | SUSE-SU-2017:1990-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_10 | 1-4.1 | SUSE-SU-2017:1853-1 |
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.
Exploit-DB 1
- Linux Kernel 4.11 - eBPF Verifier Log Leaks Lower Half of map Pointer EDB-42048 · dos · May 22, 2017 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 6
- USN-3361-1 linux-hwe vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-3364-1 linux, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3364-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-3364-3 linux-aws, linux-gke vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:1853-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1990-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
References
- 42048 exploit
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0d0e57697f162da4aa218b5feafe614fb666db07
- https://source.android.com/security/bulletin/2017-09-01
- https://github.com/torvalds/linux/commit/0d0e57697f162da4aa218b5feafe614fb666db07
- 98635 vdb-entry
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1251
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.1