CVE-2025-67269: n/a
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.
AI Analysis
Technical Summary
CVE-2025-67269 is an integer underflow vulnerability in the nextstate() function of gpsd (in gpsd/packet.c) before commit ffa1d6f40bca0b035fc7f5e563160ebb67199da7. When parsing a NAVCOM packet, the payload length is computed as lexer->length = (size_t)c - 4 without validating if the input byte c is less than 4. This causes an unsigned integer underflow, setting lexer->length to a very large value near SIZE_MAX. Consequently, the parser enters a loop attempting to consume this massive number of bytes, resulting in 100% CPU usage and a Denial of Service condition. The vulnerability affects gpsd versions prior to 3.26.1. Red Hat has issued security advisories and updated packages to fix this issue.
Potential Impact
The vulnerability allows an attacker to cause a Denial of Service by sending a malformed NAVCOM packet that triggers an integer underflow in the payload length calculation. This results in the gpsd process consuming excessive CPU resources, potentially disrupting GPS data services relying on gpsd. There is no indication of confidentiality or integrity impact from this vulnerability.
Mitigation Recommendations
A security update fixing this vulnerability is available in gpsd version 3.26.1. Users should apply the update provided by their vendor, such as the Red Hat Enterprise Linux 10 update packages. Refer to Red Hat advisory RHSA-2026:0770 for detailed update instructions. No additional mitigation is required once the update is applied.
CVE-2025-67269: n/a
Description
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.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-67269 is an integer underflow vulnerability in the nextstate() function of gpsd (in gpsd/packet.c) before commit ffa1d6f40bca0b035fc7f5e563160ebb67199da7. When parsing a NAVCOM packet, the payload length is computed as lexer->length = (size_t)c - 4 without validating if the input byte c is less than 4. This causes an unsigned integer underflow, setting lexer->length to a very large value near SIZE_MAX. Consequently, the parser enters a loop attempting to consume this massive number of bytes, resulting in 100% CPU usage and a Denial of Service condition. The vulnerability affects gpsd versions prior to 3.26.1. Red Hat has issued security advisories and updated packages to fix this issue.
Potential Impact
The vulnerability allows an attacker to cause a Denial of Service by sending a malformed NAVCOM packet that triggers an integer underflow in the payload length calculation. This results in the gpsd process consuming excessive CPU resources, potentially disrupting GPS data services relying on gpsd. There is no indication of confidentiality or integrity impact from this vulnerability.
Mitigation Recommendations
A security update fixing this vulnerability is available in gpsd version 3.26.1. Users should apply the update provided by their vendor, such as the Red Hat Enterprise Linux 10 update packages. Refer to Red Hat advisory RHSA-2026:0770 for detailed update instructions. No additional mitigation is required once the update is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2025-12-08T00:00:00.000Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2025-67269","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:0770","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:0771","vendor":"Red Hat"}]
Threat ID: 6957eb35db813ff03ef3559e
Added to database: 01/02/2026, 15:58:45 UTC
Last enriched: 07/15/2026, 08:22:04 UTC
Last updated: 09/10/2026, 19:36:51 UTC
Views: 221
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