CVE-2009-1895
High
Description
The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID setting that does not clear the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags when executing a setuid or setgid program, which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL pointer dereference attacks, (2) bypass the mmap_min_addr protection mechanism, or (3) defeat address space layout randomization (ASLR).
SeverityHigh
CVSS7.2
Exploit probability—
Product
Linux Kernel
PublishedJul 16, 2009
First seenJul 16, 2009
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v ≤ 2.6.31, 2.6.31 | — |
| debian debian_linux | 4.0, 5.0 | — |
| canonical ubuntu_linux | 6.06, 8.04, 8.10, 9.04 | — |
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