Description
The parisc_show_stack function in arch/parisc/kernel/traps.c in the Linux kernel before 2.6.28-rc7 on PA-RISC allows local users to cause a denial of service (system crash) via vectors associated with an attempt to unwind a stack that contains userspace addresses.
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 4.0 | fai-kernels | 1.17+etch.24etch2 | DSA-1794-1 |
| Debian 4.0 | linux-2.6 | 2.6.18.dfsg.1-24etch2 | DSA-1794-1 |
| Debian 4.0 | linux-2.6.24 | 2.6.24-6~etchnhalf.8etch1 | DSA-1787-1 |
| Debian 4.0 | user-mode-linux | 2.6.18-1um-2etch.24etch2 | DSA-1794-1 |
Advisories 2
- DSA-1787-1 linux-2.6.24 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1794-1 linux-2.6 - multiple vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 33756 third-party-advisory
- DSA-1794 vendor-advisory
- 35011 third-party-advisory
- http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.28-rc7
- [linux-parisc] 20080729 [PATCH] fix unwind crash - was: Re: 2.6.26 kernel crash mailing-list
- 34981 third-party-advisory
- 32636 vdb-entry
- DSA-1787 vendor-advisory
- USN-715-1 vendor-advisory
- http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git%3Ba=commit%3Bh=7a3f5134a8f5bd7fa38b5645eef05e8a4eb62951
- linux-kernel-pariscshowstack-dos(47075) vdb-entry
- 32933 third-party-advisory