Description
The (1) sparc_mmap_check function in arch/sparc/kernel/sys_sparc.c and the (2) sparc64_mmap_check function in arch/sparc64/kernel/sys_sparc.c, in the Linux kernel 2.4 before 2.4.36.5 and 2.6 before 2.6.25.3, omit some virtual-address range (aka span) checks when the mmap MAP_FIXED bit is not set, which allows local users to cause a denial of service (panic) via unspecified mmap 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 4.0 | fai-kernels | 1.17+etch.18etch5 | DSA-1588-1 |
| Debian 4.0 | linux-2.6 | 2.6.18.dfsg.1-18etch5 | DSA-1588-1 |
| Debian 4.0 | user-mode-linux | 2.6.18-1um-2etch.18etch5 | DSA-1588-1 |
Advisories 1
- DSA-1588-1 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- linux-kernel-mmap-dos(42681) vdb-entry
- 30368 third-party-advisory
- http://www.kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.36.5
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.25.3
- ADV-2008-1716 vdb-entry
- 1020119 vdb-entry
- 30499 third-party-advisory
- DSA-1588 vendor-advisory
- 29397 vdb-entry
- 31107 third-party-advisory
- [git-commits-head] 20080507 sparc: Fix mmap VA span checking. mailing-list
- USN-625-1 vendor-advisory