CVE-2009-2692
Publication date 13 August 2009
Last updated 24 July 2024
Ubuntu priority
The Linux kernel 2.6.0 through 2.6.30.4, and 2.4.4 through 2.4.37.4, does not initialize all function pointers for socket operations in proto_ops structures, which allows local users to trigger a NULL pointer dereference and gain privileges by using mmap to map page zero, placing arbitrary code on this page, and then invoking an unavailable operation, as demonstrated by the sendpage operation (sock_sendpage function) on a PF_PPPOX socket.
Mitigation
Ubuntu 8.04 and later have a default setting of 65536 in /proc/sys/vm/mmap_min_addr. When set, this issue is blocked. If your value is 0, please purge the "wine" and "dosemu" packages, and reset the value: sudo apt-get purge wine dosemu echo 65536 | sudo tee /proc/sys/vm/mmap_min_addr On Ubuntu 6.06, we recommend the work-around detailed in the linked bug.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| linux | ||
| linux-source-2.6.15 | ||
Patch details
| Package | Patch details |
|---|---|
| linux | |
| linux-source-2.6.15 |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.8 · High
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |