Description
The adjust_branches function in kernel/bpf/verifier.c in the Linux kernel before 4.5 does not consider the delta in the backward-jump case, which allows local users to obtain sensitive information from kernel memory by creating a packet filter and then loading crafted BPF instructions.
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 | 4.4.2-1 | — |
| Debian 13 | linux | 4.4.2-1 | — |
| Debian 12 | linux | 4.4.2-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux-lts-wily | 4.2.0-35.40~14.04.1 | USN-2947-2 |
Advisories 2
- USN-2947-2 linux-lts-wily vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- WID-SEC-2024-0152 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 17, 2024
References
- https://github.com/torvalds/linux/commit/a1b14d27ed0965838350f1377ff97c93ee383492
- USN-2947-3 vendor-advisory
- USN-2947-2 vendor-advisory
- USN-2947-1 vendor-advisory
- [oss-security] 20160214 CVE Request: Linux: Incorrect branch fixups for eBPF allow arbitrary read mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1308452
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a1b14d27ed0965838350f1377ff97c93ee383492
- openSUSE-SU-2016:1008 vendor-advisory