An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent downstream RSVP neighbor to cause kernel memory exhaustion, leading to a kernel crash, resulting in a Denial of Service (DoS).

The kernel memory leak and eventual crash will be seen when the downstream RSVP neighbor has a persistent error which will not be corrected.

System kernel memory can be monitored through the use of the 'show system statistics kernel memory' command as shown below:

user@router> show system statistics kernel memory
Memory               Size (kB) Percentage When
  Active                 753092     18.4% Now
  Inactive               574300     14.0% Now
  Wired                  443236     10.8% Now
  Cached                1911204     46.6% Now
  Buf                     32768      0.8% Now
  Free                   385072      9.4% Now
Kernel Memory                             Now
  Data                   312908      7.6% Now
  Text                     2560      0.1% Now
...

This issue affects:
Junos OS:

• All versions before 20.4R3-S9,
• from 21.4 before 21.4R3-S5,
• from 22.1 before 22.1R3-S5,
• from 22.2 before 22.2R3-S3,
• from 22.3 before 22.3R3-S2,
• from 22.4 before 22.4R3,
• from 23.2 before 23.2R2;

Junos OS Evolved:

• All versions before 21.4R3-S5-EVO,
• from 22.1-EVO before 22.1R3-S5-EVO,
• from 22.2-EVO before 22.2R3-S3-EVO,
• from 22.3-EVO before 22.3R3-S2-EVO,
• from 22.4-EVO before 22.4R3-EVO,
• from 23.2-EVO before 23.2R2-EVO.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-39560
• https://supportportal.juniper.net/JSA83020