VulnerabilityModified

CVE-2022-2928

Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

MEDIUM 6.5EPSS 0.69%

Does this matter?

Lower severity and a low EPSS score (0.69%). Track it; it rarely justifies an emergency change on its own.

Description

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.69% probability · 51th percentile
CISA KEV: Not listed
Weakness: CWE-476
Affected: isc/dhcp · debian/debian linux · fedoraproject/fedora
Source: security-officer@isc.org

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.