Description
The perf_callchain_user_64 function in arch/powerpc/perf/callchain.c in the Linux kernel before 4.0.2 on ppc64 platforms allows local users to cause a denial of service (infinite loop) via a deep 64-bit userspace backtrace.
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 | 4.1.3-1 | — |
| Debian 13 | linux | 4.1.3-1 | — |
| Debian 12 | linux | 4.1.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-riscv +6 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +4 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +3 | No fix yet | — |
| Ubuntu 14.04 LTS | linux | 3.13.0-49.83 | — |
| Ubuntu 14.04 LTS | linux-lts-utopic | 3.16.0-34.47~14.04.1 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | perf +18 | 3.10.0-327.el7 | RHSA-2015:2152 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +11 | 3.10.0-327.el7 | ELSA-2015-2152 |
Advisories 2
- RHSA-2015:2152 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- ELSA-2015-2152 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 24, 2015
References
- https://github.com/torvalds/linux/commit/9a5cbce421a283e6aea3c4007f141735bf9da8c3
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- USN-2760-1 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1218454
- USN-2759-1 vendor-advisory
- [oss-security] 20150818 CVE request - Linux kernel - perf on ppp64 - unbounded checks in perf_callchain_user_64 denial of service. mailing-list
- 1033728 vdb-entry
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9a5cbce421a283e6aea3c4007f141735bf9da8c3
- 76401 vdb-entry
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2