CVE-2025-67269
High · 7.5CVSS
7.5
EPSS
0.6%
Published
Jan 2, 2026
CISA due date
—
The record
An integer underflow vulnerability exists in the `nextstate()` function in `gpsd/packet.c` of gpsd versions prior to commit `ffa1d6f40bca0b035fc7f5e563160ebb67199da7`. When parsing a NAVCOM packet, the payload length is calculated using `lexer->length = (size_t)c - 4` without checking if the input byte `c` is less than 4. This results in an unsigned integer underflow, setting `lexer->length` to a very large value (near `SIZE_MAX`). The parser then enters a loop attempting to consume this massive number of bytes, causing 100% CPU utilization and a Denial of Service (DoS) condition.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| AlmaLinux:10 | gpsd | 0 | 1:3.26.1-1.el10_1.1 |
| AlmaLinux:10 | gpsd-clients | 0 | 1:3.26.1-1.el10_1.1 |
| AlmaLinux:10 | python3-gpsd | 0 | 1:3.26.1-1.el10_1.1 |
| AlmaLinux:9 | gpsd-minimal | 0 | 1:3.26.1-1.el9_7.1 |
| AlmaLinux:9 | gpsd-minimal-clients | 0 | 1:3.26.1-1.el9_7.1 |
| Mageia:9 | gpsd | 0 | 3.25-1.1.mga9 |
| openSUSE:Tumbleweed | gpsd | 0 | 3.27.3-1.1 |